All tools
Free, private, browser-local tools. Everything runs in your browser — no sign-up, nothing uploaded. The few tools that fetch a URL say so on their page.
Absolute value, sign, or negation for a whole column
Paste a column of numbers and apply absolute value, sign extraction (-1/0/1), sign flipping, or force-negative to every value at once, with rounding and an audit table.
Strip accents and transliterate text to plain ASCII
Paste text and strip accents to plain ASCII. Transliterate non-Latin scripts, preserve chosen characters, lowercase, and audit unmapped output.
Extract Action Items from Meeting Notes
Extract action items, owners, and decisions from meeting notes or daily notes with deterministic rules. Markdown checklist or JSON, private in-browser.
Add Line Numbers
Add line numbers to every line of text online, like nl or cat -n — custom start, step, separator, and alignment. Free and private, runs in your browser.
Parse a Postal Address
Parse a freeform postal address into street, unit, city, region, postcode, and country fields. Local, rule-based, and browser-only.
Adjacency Matrix Converter
Convert a graph between edge list, adjacency matrix, and incidence matrix — directed or undirected, weighted or not. Free, private, runs in your browser.
AES cipher
Encrypt or decrypt text with AES in CBC, CTR, GCM or ECB mode and 128/192/256-bit keys, with hex/base64 I/O — in your browser. Nothing is uploaded.
AES Key Wrap
Wrap and unwrap cryptographic keys with AES Key Wrap (KW / RFC 3394, KWP / RFC 5649) using a 128/192/256-bit KEK — hex or base64, free and in-browser.
Age Calculator
Calculate your exact age from your date of birth — years, months and days, next birthday countdown and total days lived. Free, private, in-browser.
Age encrypt
Encrypt small text into an ASCII-armored age ciphertext with a passphrase or native X25519 recipients.
Age Key Generator
Generate an age X25519 identity and its shareable age1 public recipient in your browser, or derive the recipient from an identity you already have.
Convert AIFF to FLAC
Convert AIFF or AIF audio to lossless FLAC in your browser — preserve samples and textual tags, choose FLAC compression level 0-12, and download the result.
Convert AIFF to WAV
Free AIFF to WAV converter that runs in your browser. Choose the PCM bit depth, sample rate and channel layout — at a matching depth the samples are identical.
Amazon Order Analyzer
Paste an Amazon order-history CSV export to summarize total spend by month, top items, and category breakdowns. Browser-only, private, with Markdown or JSON output.
Amcache Parser
Parse Windows Amcache.hve bytes from hex or Base64 and report application, executable, driver, shortcut, SHA-1 hash and timestamp evidence locally.
ANSI Log Renderer
Paste ANSI-colored terminal output or CI logs and render them as HTML, or strip escape codes to plain text. Handles 16-color, 256-color, and truecolor SGR codes.
API response diff
Compare two JSON API responses and see only the meaningful changes: ignore request ids, timestamps and UUIDs, match arrays by key or as sets, export a JSON Patch.
Apply a Unified Diff to a File
Paste a file and a unified diff to get the patched text in your browser, with reverse apply, fuzz matching, and per-hunk conflict reports.
ARFF Converter
Convert Weka ARFF datasets to CSV and CSV tables back to ARFF locally — nominal attributes, numeric types, dates, sparse rows, missing values, and type rows.
Argon2 hash
Hash a password with Argon2id (configurable memory, iterations, parallelism) and get a PHC string, or verify a password — in your browser. Nothing is uploaded.
Article to EPUB
Turn article text or cleaned HTML into a valid EPUB 3 ebook with metadata, chapter splits, and a real table of contents. Runs in your browser.
ASN.1 / DER parser
Parse an ASN.1 / DER hex string into a readable tree of tags, lengths, OIDs and values — free, in your browser. Inspect X.509 certificates, keys and CSRs.
Rust AST Diff
Compare two Rust source snippets structurally. The tool parses both files, canonicalizes their ASTs, and ignores formatting, whitespace, and comments.
Convert Audio Bit Depth
Convert audio between 8, 16, 24-bit and 32-bit float PCM with proper dithering on down-conversion. Runs in your browser, nothing is uploaded, free.
Bleep or Mute Regions of an Audio File
Censor an audio file in your browser — bleep, mute, or duck the exact time regions you pick. Set a tone frequency and output format. Nothing is uploaded, free.
Audio Channel Tool
Swap left/right channels, downmix stereo to mono, up-mix mono to stereo, or copy one side onto both — right in your browser. Nothing is uploaded, free.
Compress an Audio File
Shrink MP3, WAV, M4A or any audio file right in your browser — pick a target bitrate (96 kbps default) and format. Nothing is uploaded, free.
Compress Audio Dynamic Range
Even out loud and quiet parts of an audio file in your browser with threshold, ratio, attack, release and make-up gain. Local and private.
Convert an Audio File
Convert any audio file to MP3, WAV, OGG, FLAC or M4A right in your browser — pick a bitrate for lossy formats. Runs locally, nothing is uploaded, free.
Remove Clicks and Pops from Audio
Repair vinyl clicks, pops, crackle, tape ticks and digital glitches in an audio file right in your browser. Nothing is uploaded, no sign-up, free.
Trim Leading & Trailing Silence
Cut dead air at the start and end of a recording while leaving middle pauses untouched — set a threshold and edge pad. Runs locally, nothing uploaded.
Add Effects to an Audio File
Add reverb, echo, chorus, tremolo and compression to audio in your browser — chain effects in one pass and download MP3, WAV or more. No upload.
Equalize an Audio File
Equalize any audio file right in your browser — boost or cut bass, mid and treble in dB, then save as MP3, WAV and more. Nothing is uploaded, free.
Fade an Audio File In and Out
Add a smooth fade-in and fade-out to any audio file right in your browser — pick the lengths in seconds. Nothing is uploaded, free.
Export Audio Features to CSV
Export per-frame audio features — RMS, spectral centroid, ZCR, rolloff, flatness, bandwidth, flux — to CSV, TSV, or JSON. Runs in your browser.
Audio Filter
Apply a low-pass, high-pass, band-pass, or notch filter to audio in your browser. Set the frequency and band width, then download — nothing is uploaded.
Fit Audio to an Exact Length
Make any audio file an exact number of seconds — pad it with silence when it's short or trim it when it's long. Runs in your browser, nothing uploaded.
High-Pass Filter Audio
Apply a high-pass (low-cut) filter to audio in your browser — set a cutoff frequency to strip rumble, hum, and handling noise.
Brick-Wall Audio Limiter
Brick-wall limit an audio file so it never clips. Set the ceiling in dBFS plus input gain, attack and release — it all runs in your browser.
Loop an Audio File
Loop any audio file right in your browser — repeat a short sound to a target duration or a number of plays, saved as MP3, WAV and more. Free.
Strip Audio Metadata
Remove ID3 tags, comments, chapters, and cover art from MP3, FLAC, OGG, M4A, WAV, and other audio files in your browser. Stream-copy audio, no upload.
Gate Background Noise Out of Audio
Gate hiss, hum and room tone out of quiet gaps in audio. Set threshold, reduction, ratio, attack and release — all in your browser.
Reduce Audio Background Noise
Remove steady background hiss and hum from an audio file right in your browser — pick a strength, choose a denoiser, download. Runs locally, nothing is uploaded, free.
Normalize Audio Loudness
Level any audio file to a standard loudness (LUFS) right in your browser — -14 for Spotify/YouTube, -16 for podcasts. Runs locally, nothing is uploaded, free.
Add Silence to Audio
Add a chosen number of seconds of silence before and after any audio clip. Pad both ends in one pass, keep the audio untouched, all in your browser.
Shorten Long Audio Pauses
Tighten speech pacing by shortening long silent gaps to a natural pause length in your browser. Nothing is uploaded, free.
Change Audio Pitch
Free online pitch changer — shift any audio up or down by semitones without changing its speed. Transpose songs, fix tuning, deepen voices in your browser.
Resample an Audio File
Change any audio file's sample rate — 8 kHz voice to 192 kHz studio — with high-quality ffmpeg resampling, right in your browser. Runs locally, nothing is uploaded, free.
Reverse Audio
Play any audio clip backwards in your browser — or join the original and its reversal for a reverse-cymbal riser. Nothing is uploaded.
Make a Phone Ringtone from a Song
Make a phone ringtone from any song in your browser — pick a start and end (up to 40 s), boost loudness, add fades, save as iPhone m4r or Android mp3.
Audio RMS level report
Measure per-channel RMS, sample peak, average level, headroom, DC offset, and clipped samples from pasted audio bytes as JSON, CSV, or a text report.
Remove Silence from Audio
Strip dead air and long pauses out of any recording right in your browser — set a silence threshold and minimum gap. Runs locally, nothing is uploaded, free.
Change Audio Speed (Keep Pitch)
Free online audio speed & tempo changer — speed up or slow down any track without changing the pitch. Set a factor, BPM ratio, or percentage in your browser.
Convert Audio to Mono
Downmix any stereo or surround audio file to mono right in your browser — blend all channels or keep just the left/right side. Nothing is uploaded, free.
Change Audio Volume
Boost or cut any audio file's volume right in your browser — by decibels or a factor, with a clipping-safe peak limiter. Nothing is uploaded, free.
Audio Waveform Video Generator
Turn audio into an animated waveform MP4 in your browser. Pick mirror, bars or wave styles, colors, gradient, size and fps. Nothing uploaded.
Authorization Header Decoder
Decode an HTTP Authorization header: Basic to username and password, Bearer token structure, Digest and AWS SigV4 params. Free, in your browser.
Autocomplete Trie
Build a prefix trie from a pasted wordlist and get ranked autocomplete suggestions for any typed prefix. Weights, typo tolerance, trie stats, JSON. Runs locally.
Avro to JSON Converter
Decode Apache Avro Object Container Files (.avro / OCF) to JSON, NDJSON, or the embedded schema — no .avsc needed, free and private in your browser.
AWS Signature V4 Signer
Generate AWS SigV4 canonical requests, strings to sign, signatures, and Authorization headers locally for S3, IAM, and AWS APIs.
Reconcile bank statement and ledger CSVs
Match bank-statement CSV rows to ledger rows by date, signed amount, and fuzzy memo similarity, with unmatched and suggested matches.
Base Decoder
Auto-detect and decode Base16, Base32, Base45, Base58, Base64, and Base85 text, including nested layers, locally in your browser.
Base32 Encoder / Decoder
Free Base32 encoder and decoder in your browser — RFC 4648, base32hex, Crockford and z-base-32 variants, hex byte I/O, optional padding. Private, no sign-up.
Base58 Encoder / Decoder
Encode text or bytes to Base58 and decode Base58 back in your browser — Bitcoin/IPFS, Ripple (XRP) and Flickr alphabets, hex I/O. Free, private, no sign-up.
Base62 Encoder / Decoder
Encode text, hex bytes, or numbers to Base62 (0-9A-Za-z) and decode back — URL-safe, no padding, arbitrary-precision numbers. Free, private, in your browser.
Base64 diff
Paste two Base64 or Base64url strings and see whether the decoded payloads really differ: first differing offset, hex dump, byte ranges, sha256 — all in your browser.
Base64 to Audio File
Decode a Base64 string or data: URI back into an audio file in your browser. Auto-detects WAV, MP3, Ogg, FLAC, M4A, AAC, WebM, AIFF and MIDI.
Base64 Validator
Validate Base64 and Base64url strings in your browser — find invalid characters, padding mistakes, mixed alphabets, line-length issues, and decoded size.
Base64 ⇄ Base64url Converter
Convert standard Base64 to URL-safe Base64url and back in your browser — swaps +/ for -_, handles = padding, auto-detects direction. Free, private, no sign-up.
Base85 Encoder / Decoder
Encode text or hex bytes to Base85 and decode Base85 back. Supports Ascii85, ZeroMQ Z85, and RFC 1924 variants with optional Adobe framing. Free, private, browser-local.
Basic Auth Header Generator
Generate an HTTP Basic Authorization header from a username and password — base64(user:pass) per RFC 7617. Runs in your browser, nothing is sent, free.
Bcrypt hash
Hash a password with bcrypt at a chosen cost and get a $2b$ hash string, or verify a password against an existing bcrypt hash — in your browser. Nothing is uploaded.
Beancount to CSV Converter
Flatten Beancount or Ledger journal postings into spreadsheet-ready CSV, then rebuild a simple journal from that flat CSV schema.
Bech32 / Bech32m Encoder & Decoder
Encode and decode checksummed Bech32 and Bech32m strings (HRP + data) as used by SegWit, Taproot, Lightning and Nostr. Free, private, browser-local.
Before / after image slider generator
Turn two images into an interactive before/after comparison slider: one self-contained HTML file with inline CSS + JS, no libraries.
Bencode decoder
Decode bencode (the BitTorrent / .torrent serialization format) into readable JSON, and re-encode JSON back into canonical bencode — in your browser. Nothing is uploaded.
BibTeX Formatter & Validator
Free BibTeX formatter and validator — pretty-print, sort and align .bib bibliography entries in your browser. Consistent indentation, no sign-up, no upload.
Convert BibTeX to CSV
Paste BibTeX and get CSV, one row per entry. Choose columns, delimiter and header, decode LaTeX accents, reformat author names, sort rows and add an Excel BOM.
Binary Encoder / Decoder
Convert text to binary and decode binary back to text instantly — byte delimiters, 0b prefix, hex byte view. Free, private, runs entirely in your browser.
BIP39 Mnemonic Seed Phrase Generator
Generate a BIP39 mnemonic seed phrase (12–24 words) with checksum and derived 512-bit seed, entirely in your browser. Optional passphrase. Free and private.
BIP39 Seed Derivation
Derive the 512-bit BIP39 seed from an existing mnemonic recovery phrase and optional passphrase, in your browser. Validates the wordlist and checksum. Free and private.
Bitcoin Address Tool
Derive Bitcoin P2PKH, P2SH-P2WPKH, P2WPKH addresses and WIF from a secp256k1 private key. Supports hex or WIF input, mainnet and testnet.
Bitcrush an Audio File
Crush audio into lo-fi, retro and 8-bit textures by reducing bit depth, lowering the effective sample rate and blending the result in your browser.
Bitwise Calculator
Bitwise calculator: AND, OR, XOR, NOT, shifts, rotates and popcount on 8–64-bit integers in binary, hex, octal or decimal. Free, private, in your browser.
Blowfish cipher
Encrypt or decrypt data with the Blowfish cipher in ECB or CBC mode, with hex/base64 I/O — in your browser. Variable 4–56 byte key. Nothing is uploaded.
Bollinger Bands calculator
Compute Bollinger Bands (SMA plus/minus standard deviations) for a price series, plus %B and bandwidth, in your browser. Free, private, no upload.
Bot Traffic Filter
Paste an access log or user-agent list, flag and strip bot/crawler hits, and see the human-versus-bot split by category. Runs in your browser.
Boxplot Chart Generator
Paste values or grouped CSV data and render a box-and-whisker SVG with quartiles, whiskers, mean markers, notches, outliers, and summary stats.
Brotli Decompress
Paste a Brotli (.br) payload as Base64 or hex and read what's inside. Output as text, hex, or Base64, with size and ratio stats. Free, private, no sign-up.
MongoDB Extended JSON Converter
Convert MongoDB Extended JSON ($oid, $date, $numberLong) to and from plain JSON, with canonical or relaxed output, in your browser.
BSON Inspector
Paste BSON bytes as base64 or hex and inspect a typed tree or canonical MongoDB Extended JSON v2 with ObjectId, dates, binary, and int64 preserved.
Budget Planner
Plan a monthly budget from take-home pay: 50/30/20 needs/wants/savings targets with custom splits, or a zero-based plan showing what's left to allocate.
Bulk Artifact Extractor
Scan pasted text for emails, URLs, IPs, domains, phones, Bitcoin addresses, and Luhn-valid card numbers with offsets and context.
Preview a Bulk File Rename
Preview old-to-new filename mappings with find/replace, regex, numbering, case conversion, prefix/suffix, and collision warnings.
Byte Drop — Remove a Byte Range
Delete a range of bytes from text, hex, or Base64 by start offset and length, and view the remainder in any format. Free, private, runs in your browser.
Byte Take — Extract a Byte Range
Extract a byte range from text, hex, or Base64 by start offset and length, output as text, hex, or Base64 — free byte slice tool, runs in your browser.
CAGR Calculator
Paste a series of values and get the compound annual growth rate, total growth, the multiple, doubling time and a period-by-period growth table.
Free Online Calculator
Evaluate any arithmetic expression instantly in your browser. Supports +, −, ×, ÷, parentheses and functions. No sign-up, runs offline.
Calendar Free/Busy Overlap
Paste two .ics calendars and list the time slots where both are free — working hours, minimum meeting length, timezones and DST handled. Free and in-browser.
CAMT.053 Statement Parser
Parse a camt.053 (or camt.052/054) ISO 20022 bank statement XML into JSON or CSV in your browser: balances, dates, counterparties, references. No upload.
Cartesian Product Generator
Generate every combination across 2-4 lists (sizes x colors x materials) — or just count them. Paste spreadsheet cells, pick any separator, output lines, CSV, JSON.
Cartesian to polar CSV converter
Convert a whole CSV of (x, y) points to polar (r, θ) coordinates in your browser, in degrees or radians, keeping your other columns intact.
Category Canonicalize
Paste a CSV, TSV, or newline list plus a variant-to-canonical mapping, then rewrite categorical values and review fuzzy suggestions for anything not covered.
Censor Text
Redact a list of words (or common profanity) in any text by masking them — case-insensitive, whole-word or substring. Runs in your browser, nothing is uploaded, free.
Validate a PEM certificate chain offline
Check a pasted PEM certificate chain offline for leaf-to-root ordering, signature linkage and expiry windows.
ChaCha20 cipher
Encrypt or decrypt text with ChaCha20 or ChaCha20-Poly1305 AEAD (RFC 8439) in your browser — 32-byte key, 12-byte nonce, hex/base64 I/O. Nothing is uploaded.
Change Case
Free online case converter — switch text between UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case and more, right in your browser.
Change Video Speed
Speed up or slow down a video right in your browser, keeping audio in sync — pick a speed factor (0.25x–4x). Re-encodes locally with ffmpeg, nothing is uploaded, free.
Mojibake Fixer / Charset Transcoder
Fix mojibake and re-decode legacy charsets (Windows-1252, Latin-1, Shift_JIS, GBK, Big5, KOI8-R) into clean UTF-8 — free, private, in your browser.
Analyze a Chat or IRC Log
Paste an IRC or chat log and get stats in your browser: who talked most, activity by hour and weekday, top words, links shared, and joins/parts/quits.
Chat Transcript Formatter
Clean a messy chat log into one consistently-formatted transcript with normalized speakers, timestamps, and WhatsApp/IRC/plain line parsing.
Check digit validator
Validate or compute check digits for Luhn cards, IMEI, NPI, ISBN-10/13, ISSN, EAN/UPC/GTIN/SSCC, IBAN, ABA routing, ISIN and VIN codes.
Checksum Calculator
Compute and verify CRC-32, CRC-32C, CRC-16, or CRC-8 checksums for text, hex, or base64 bytes, with hex or decimal output.
Chi-square test
Run Pearson's chi-square test online: goodness-of-fit or contingency-table independence with statistic, df, p-value and Cramér's V. Free, in-browser, no upload.
Child Growth Percentile Calculator
Compute CDC child growth-chart percentiles and z-scores from age, sex, height, weight and head circumference. Supports metric or US units.
Add Chorus to Audio
Add a configurable chorus effect to an audio file in your browser with ffmpeg: voices, delay, depth, rate, decay, and output format controls.
Chunk list into batches
Split pasted lines or comma-separated items into fixed-size chunks for batching APIs, imports, prompts, and review queues.
Chunk Text for RAG
Split long text into overlapping chunks by token, character, or word count for RAG and embedding pipelines. Word, sentence, or paragraph boundaries. Runs in your browser.
Churn cohort retention
Build monthly, weekly, or daily cohort retention and churn tables from signup and activity CSV data, with weighted averages and export formats.
CIDR Calculator
CIDR calculator: get network address, broadcast, netmask, wildcard, usable host range and host count for any IPv4 or IPv6 prefix. Free, private, in-browser.
CipherSaber-2 cipher
Encrypt and decrypt CipherSaber-2 (RC4 with a 10-byte IV and repeated key setup) in your browser — hex or base64 output. Free, private, nothing uploaded.
Citation Generator
Free APA 7, MLA 9, Chicago and Harvard citation generator — format author, title, year, journal and URL into a correct reference right in your browser.
Rebalance an imbalanced CSV label column
Rebalance an imbalanced CSV label column by seeded random over- or under-sampling of whole rows toward a target class ratio. Reproducible, in-browser, no synthetic rows.
Classical Cipher Tool
Encrypt and decrypt Caesar, Vigenère, Atbash, and rail-fence ciphers in your browser, with a Caesar brute-force listing all 26 shifts. Free and private.
Detect Clipping in WAV Audio
Paste base64 or hex WAV bytes and detect clipped full-scale samples, consecutive clipping runs, timestamps, and worst distorted regions. Runs locally in your browser.
Current UTC Time
See the current UTC date and time, updating live in your browser. No sign-up, runs offline.
Cloud Share → Direct Download Link
Paste a Nextcloud, Dropbox, Google Drive or OneDrive share link and get the direct-download URL — plus markdown, HTML, curl or wget. Batch, offline, no sign-up.
Cluster Similar Values
Group near-duplicate values in a column (typos, casing, spacing) and get a canonical form per cluster. Runs in your browser, nothing is uploaded, free.
AES-CMAC Generator
Generate an AES-CMAC (NIST SP 800-38B / RFC 4493) of any message and key in your browser — AES-128/192/256 by key length, hex or base64 output. Free and private.
CMYK JPEG to RGB Converter
Convert a CMYK or Adobe YCCK JPEG to a standard RGB PNG, JPEG or WebP in your browser. Choose format, quality and chroma. No upload.
Code Chunker
Split Python, Rust, JavaScript, TypeScript, Go, Java, C/C++, C#, PHP, or Swift into line-ranged chunks that keep functions and classes intact.
Code Comment Extractor
Paste source code and list or remove comments across JavaScript, Python, Rust, SQL, HTML, CSS, shell, YAML and more. Filters, JSON, markdown and stats included.
Code Formatter
Beautify and re-indent minified or messy HTML, CSS, JavaScript, or JSON. Auto-detect the language, choose spaces or tabs, and format locally in your browser.
Code language detector
Detect the likely programming language of a pasted code snippet with ranked alternatives, confidence and explainable signals.
Code metrics analyzer
Paste source code and get line counts, function counts, approximate cyclomatic complexity, maintainability, and risk bands. Runs locally in your browser.
Outline a Source File's Functions, Classes & Methods
Paste source code and get a nested outline of its functions, classes, and methods as an indented tree, Markdown table of contents, or JSON. Runs fully in your browser.
Color Code Extractor
Extract hex, rgb(a), hsl(a), hwb and named CSS color values from pasted CSS or text, deduplicate them, and export the palette in useful formats.
Color Contrast Checker
WCAG colour contrast checker — get the contrast ratio and AA / AAA pass-fail for any text and background colour, plus an accessible suggestion. Free, in-browser.
Color converter
Convert a color between HEX, RGB(A), HSL, HSV and CMYK, in your browser. Paste any notation and get them all. Nothing is uploaded.
Color palette generator
Generate a color palette from any base color — complementary, analogous, triadic, tetradic, monochromatic, shades and tints. Free, runs in your browser.
Color shades generator
Generate a ramp of tints, shades and tones from any base color, including a Tailwind-style 50-900 scale, in HEX, RGB and HSL. Runs in your browser, nothing is uploaded.
Align Text into Neat Columns
Paste whitespace-, tab-, comma-, or pipe-delimited text and align it into neat fixed-width plain-text columns with Unicode-aware padding.
Column Math
Element-wise math on two columns of numbers — add, subtract, multiply, or divide two lists row by row in your browser. Free, private, no sign-up.
Compare one column across two tables, matched by key
Join two CSVs on a key column and report every row where a single chosen value column disagrees, as clean old → new pairs. Browser-local, no upload.
Docker Compose to Mermaid diagram
Convert docker-compose.yml into Mermaid flowchart text showing services, dependencies, ports, volumes, and networks.
Compound Interest Calculator
Compute savings future value with compound interest, optional deposits, APY, total interest and a year-by-year schedule.
Validate config files with line and column errors
Validate pasted JSON, YAML, TOML, INI or XML config files in your browser with line/column diagnostics, context, hints and JSON reports.
Config Merge Tool
Merge layered JSON, YAML, TOML and .env configuration files with override precedence, array strategy, null deletion and variable substitution.
Drop constant columns from a CSV
Find and remove constant (zero-variance) columns from a CSV — columns with one repeated value or all blanks. In-browser, no upload.
Extract Emails & Phone Numbers from Text
Extract emails and phone numbers from pasted text. Deduplicated, counted, sorted, and private in your browser with no upload.
Context Trimmer
Trim text to an approximate token budget for LLM prompts, keeping the head, tail, middle, or both ends. Runs locally in your browser.
Cookie Parser
Split a Cookie or Set-Cookie header into individual cookies with their attributes — Domain, Path, Expires, Max-Age, Secure, HttpOnly, SameSite. Free, in your browser.
Cookie String to JSON
Parse a raw HTTP Cookie header string into JSON — name/value object or an array of {name, value} pairs, with optional URL-decoding. Free, in your browser.
Cookieless Visitor Counter
Count unique visitors in an Apache, nginx, JSON or CSV access log with the daily-salted-hash method. No cookies, no PII kept. Runs in your browser, free.
Prune highly correlated features
Drop multicollinear numeric columns by thresholded Pearson, Spearman, or Kendall correlation. In-browser, no upload.
Correlated sample generator
Generate multivariate-normal sample data from a covariance or correlation matrix, with seeded CSV, TSV, JSON or stats output.
Count line frequency
Count how often each line or value occurs and rank them most to least frequent, in your browser. Like sort | uniq -c | sort -rn. Nothing is uploaded.
Critical Path Method Calculator
Find the critical path, project duration, earliest/latest start & finish, and slack from a task list — with PERT three-point estimates. Runs in your browser.
Cron Next Run Times
Cron expression parser and next-run calculator — see upcoming run times in UTC with plain-English schedules, free and entirely in your browser.
CSS Autoprefixer
Free online CSS autoprefixer — paste CSS and add the -webkit-, -moz-, -ms-, -o- vendor prefixes browsers still need. Runs entirely in your browser.
CSS Color Converter
Paste any color — hex, rgb, hsl, hwb, oklch, oklab, a CSS name or 0xAARRGGBB — and get every other notation for it, plus CMYK, Display P3 and WCAG contrast.
CSS Gradient Generator
Generate CSS linear, radial and conic gradients — pick type, angle and color stops, then copy a ready-to-paste background-image. Free, in-browser.
CSS px to rem Converter
Paste CSS and convert every px length to rem (or rem back to px) at any root font size. Filter properties, keep 1px borders, add fallbacks — all in your browser.
Find CSV rows with no matching key
Return rows in CSV A whose key has no match in CSV B, or the reverse, with composite keys, alternate delimiters, and browser-local processing.
CSV Cell Diff
Compare two CSVs column-by-column and highlight every individual cell that changed, plus added and removed rows and columns.
Change CSV Delimiter
Re-save CSV or delimited data with a different separator (comma, tab, semicolon, pipe) with correct requoting — in your browser. Free, private, no upload.
Generate a Chart from CSV
Paste CSV data and generate a bar, line, scatter, or histogram chart as a clean, scalable SVG — in your browser, nothing uploaded. Pick columns, colors, and size.
CSV Cleaner
Clean a messy CSV in your browser: trim whitespace, remove duplicate rows, drop empty rows, fill blanks, and normalize delimiters. No upload, free.
CSV Coalesce Columns
Merge CSV columns into one by taking the first non-empty value per row, in the priority order you choose. Add a fallback, drop the sources. Free, in-browser.
Collapse CSV rows into one cell per group
Group CSV rows by key columns and join another column into one delimited cell, with dedupe, sorting, and browser-local processing.
CSV Column Mapping Suggest
Suggest source-to-target CSV column mappings using fuzzy header similarity and sampled value overlap. Outputs confidence scores, reasons, and unmapped columns.
CSV Column Number Formatter
Give a CSV column one uniform number format: fixed decimals, a rounding mode, thousands grouping, sign style and units. Free, runs entirely in your browser.
CSV Column Splitter & Concatenator
Split a CSV column into multiple columns by delimiter, or concatenate columns into one. Header-aware, trim options, exact CSV output, in-browser.
CSV Column Type Validator
Validate CSV columns against declared types like int, float, bool, date, and enum, with row/line reports for every offending cell.
CSV Date Normalizer
Normalize a CSV date column to ISO 8601, Unix time, SQL, or a custom pattern. Infers day-first vs month-first per column. Free, runs in your browser.
CSV Dedupe
Remove duplicate rows from a CSV, keeping the first — optionally keyed on chosen columns. Runs in your browser, nothing is uploaded, free.
CSV Fill Down
Forward-fill empty CSV cells with the last non-empty value above them, like a spreadsheet fill-down. Fill up too, pick columns. Runs in your browser, free.
CSV Filter
Keep only the CSV rows that match a condition (e.g. age > 30, city == NYC, name contains al) — numeric or string, in your browser. Free, private, no upload.
Find incomplete CSV rows
Scan a CSV for malformed rows: too few or too many fields, or blank cells in required columns. Runs in your browser. Free, private, no upload.
CSV Formula Eval
Add or transform CSV columns with spreadsheet-style formulas (e.g. total = price * qty) — runs in your browser. Free, private, no upload.
CSV Group By
Group CSV rows by a column and aggregate others (count, sum, average, min, max) — in your browser. Free, private, no upload.
CSV Header Sanitizer
Clean messy CSV column names into valid snake_case, camelCase, or kebab-case identifiers. Fixes blanks and leading digits, deduplicates collisions. Free, in-browser.
CSV Insert Column
Add a new column to a CSV at any position, filled with a constant value — in your browser. Free, private, no upload.
CSV Join
Join two CSV files on a key column, SQL-style — inner, left, right, or full outer. Different key names, custom delimiter, case control. In your browser, no upload.
CSV ⇄ JSON Converter
Convert CSV to JSON or JSON to CSV in your browser — auto-detects direction, infers types, handles quoted fields and custom delimiters. Free, no upload.
CSV Null Standardizer
Paste a CSV or TSV and rewrite NA, N/A, #N/A, NULL, NaN, None, dashes and blank cells into one missing-value token. Runs locally in your browser.
CSV Numeric Column Extractor
Paste a CSV or TSV and get back only the columns that are fully numeric, as typed JSON arrays, records, CSV or a name list. Runs in your browser.
CSV PII redactor
Mask, salted-hash, or redact the values in chosen CSV columns for safe sharing — pick columns by name or index, in your browser. Free, private, no upload.
CSV Pivot Table
Build a pivot table from a CSV — group by rows, spread a column's values across columns, aggregate (sum/count/avg/min/max). Runs in your browser, free, no upload.
CSV Query
Query a CSV with SQL-style SELECT, WHERE, ORDER BY, and LIMIT — right in your browser. Free, private, no upload.
CSV Quote Normalizer
Paste a CSV to fix mixed quoting — backslash escapes, single or curly quotes, stray quotes — and re-emit it as clean RFC 4180. Runs in your browser.
CSV Ragged Row Padder
Pad short CSV rows, truncate or flag long rows, and normalize every record to a uniform field count. Paste ragged CSV or TSV and export clean text in your browser.
CSV Regex Find and Replace
Run a regex find-and-replace on chosen CSV columns, with $1 capture groups. Quoted fields stay intact. Free, runs entirely in your browser.
CSV reorder columns
Reorder, swap, or drop CSV columns by name or index to a target order, in your browser. Free, private, no upload.
Add a Row Index, UUID, or Key Column to CSV
Add sequential row numbers, UUIDs, or composite key columns to CSV data online. Choose the delimiter, header handling, position, padding, prefix, and suffix.
CSV Sample
Take a random, systematic, top-N, bottom-N, or stratified sample of rows from a large CSV. Reproducible by seed, in your browser — no upload, no sign-up.
CSV Sort
Sort CSV or TSV rows by one or more columns, ascending or descending, numeric-aware or lexical. Multi-key with per-column direction. Runs in your browser, free.
CSV stats
Compute per-column count, distinct, min, max, mean and sum for a CSV, in your browser. Free, private, no upload.
Validate CSV structure
Validate CSV structure online: find ragged rows, inconsistent column counts, unclosed quotes, and stray delimiters with line numbers. Free, private, in-browser.
CSV timeline viewer
Paste a CSV, TSV or JSON Lines event log and filter it by time range, search every column, sort, pick columns and page through the matches locally.
CSV to GeoJSON Converter
Convert CSV, TSV, pipe, semicolon, or JSON coordinate tables into GeoJSON points, lines, or polygons with typing, bbox, and invalid-row controls.
CSV to ICS
Paste a CSV of events and get an .ics calendar file to import into Google Calendar, Outlook or Apple Calendar. Free, private, runs in your browser.
CSV to Ledger
Convert a bank or credit-card CSV export into double-entry ledger/hledger journal transactions. Auto-detects columns, guesses accounts, runs in your browser.
CSV to NDJSON Converter
Convert CSV to NDJSON in your browser — one JSON object per row for streaming pipelines, with type inference and custom delimiters. No upload.
CSV to PDF Table
Render CSV, TSV, semicolon, or pipe-delimited data as a formatted PDF table with headers, pagination, page size, orientation, font size, grid, and banding controls.
CSV to SQL
Convert CSV or JSON rows into SQL CREATE TABLE and INSERT statements with inferred column types for MySQL, PostgreSQL, SQLite, SQL Server, or ANSI SQL. Free, in-browser.
CSV to table
Convert CSV data into a Markdown or HTML table, in your browser. Free, private, no upload.
CSV to vCard Converter
Convert CSV or JSON contact lists into a single .vcf vCard file for iPhone, Android, Google Contacts, Outlook, and CRM imports.
CSV to Excel (.xlsx)
Convert CSV, TSV or JSON into a real Excel .xlsx workbook — typed number/boolean columns, a bold frozen header, auto-fit widths. In-browser, nothing uploaded.
CSV to XML
Convert a CSV table into XML records using the header names as element tags, in your browser. Free, private, no upload.
CSV to YAML
Convert a CSV table into a YAML list of objects keyed by the header row, in your browser. Free, private, no upload.
CSV transpose
Transpose a CSV — swap rows and columns so the header becomes the first column — in your browser. Free, private, no upload.
CSV Type Inferrer
Paste CSV and get a JSON schema: auto-detected delimiter, header row, and per-column types (int, float, bool, date, datetime, string). Runs in your browser.
CSV Whitespace Normalizer
Paste a CSV or TSV to trim every cell, collapse or remove the spaces inside values, and clean up non-breaking spaces. Runs locally in your browser.
CSV Window Functions
Add SQL window-function columns to CSV rows in your browser: running total, moving average, lag, lead, rank, dense_rank, and row_number, with partition and order support.
Build a Pareto cumulative percentage table
Sort label/value rows and add percent of total, cumulative sum, cumulative percent, running count, vital-few labels, and a text Pareto chart.
Cumulative Sum Calculator
Get the running total (prefix sum) of a list of numbers in your browser, with optional running average, min, and max at each step. Free, private, no sign-up.
cURL Command Parser
Paste a curl command to see its method, URL, query params, headers, body, auth, cookies and flags — or rebuild clean curl. Browser-only.
Currency Converter
Convert an amount between currencies using an exchange-rate table you paste. Chains multi-leg rates, reverses rates automatically, no live data. Free & in-browser.
Decode/Transform Recipe Pipeline
Chain byte-level decode/transform steps — Base64, hex, URL, gzip/zlib, XOR, ROT13 — into one recipe, applied top to bottom. Free, private, runs entirely in your browser.
Data anonymizer
Anonymize a CSV in your browser: redact identifier columns, generalize quasi-identifiers into bins, and get a k-anonymity report. Free, private, no upload.
Data Binning Tool
Bin a numeric CSV column into equal-width, quantile (equal-frequency), or custom-edge buckets and label each row. Runs entirely in your browser, free — nothing uploaded.
Cluster Tabular Data
Paste CSV data and cluster it with KMeans, DBSCAN, or hierarchical methods, then export an SVG scatter plot, labeled CSV, or JSON report.
Data drift summary
Paste a baseline and a current CSV to get a per-column drift report: type, null rate, cardinality, range, new or missing categories and a PSI or JSD score.
Data Format Converter
Convert data between CSV, TSV, JSON, and NDJSON (JSONL) in any direction — auto-detects the source, infers types, unions keys. Free, in-browser, no upload.
Identify a data sample's format, delimiter and columns
Paste a data sample and find out what it is: CSV, TSV, JSON, JSON Lines, XML, HTML, fixed-width or binary, plus delimiter, quote char, encoding and column types.
Data Normalizer
Normalize CSV columns with min-max, z-score, or robust (median/IQR) scaling. Pick columns and delimiter. Runs entirely in your browser, free — nothing uploaded.
Reshape JSON, YAML, CSV & XML with a query
Parse JSON, YAML, CSV, or XML and reshape it with JSONata into new JSON or YAML — filter, aggregate, and restructure in one browser-local step.
Data URI Decoder
Decode a data: URI into its MIME type, charset and payload — text decoded inline, binaries with detected type and hex preview, all in your browser.
Data URI Encoder
Turn text into a self-contained data: URI with a chosen MIME type and Base64 or percent encoding. No sign-up, runs offline in your browser.
Data Validator
Validate pasted CSV or JSON rows against field rules — required, unique, type, range, length, regex, enum — and list every violation. Free, runs in your browser.
Date Column Validator
Check every value in one CSV date column against a chosen format — ISO, US, EU, RFC 3339, or a custom pattern — with a per-row report of invalid dates.
Date Difference Calculator
Calculate the exact duration between two dates: years, months, days, hours, minutes and seconds, with leap years handled. Free, private, in-browser.
Date Format Normalizer
Paste text with dates in mixed formats and get them all rewritten to ISO 8601 or any format you pick, with the day/month order settled from the text. Free and private.
Remove Harsh Sibilance from Vocals
Free browser de-esser: duck harsh s, sh and t sibilance on vocals, narration and podcasts. Tune amount, band and reduction, or audition the removed esses.
Deadline Countdown
Compute time remaining or overdue for dated tasks, label urgency, and sort the list by deadline in table, Markdown, JSON, or CSV format.
Debt Payoff Planner
Plan how to pay off multiple debts with the snowball or avalanche method. See your debt-free date, total interest, payoff order and the savings from an extra payment.
Decision tree classifier
Train a CART, ID3, or C4.5-style decision tree from a pasted CSV table and read the if/then rules, feature importance, accuracy, and predictions.
Dependency Risk Auditor
Audit a package.json, package-lock.json, yarn.lock or pnpm-lock.yaml for wildcard versions, git/URL deps, install scripts and missing integrity hashes.
DES cipher
Encrypt or decrypt data with single DES in ECB or CBC mode, with hex/base64 I/O — in your browser. For legacy interop. Nothing is uploaded.
Descriptive statistics
Compute mean, median, mode, variance, standard deviation, quartiles, min and max for a list of numbers, in your browser. Free, private, no upload.
Diceware Passphrase Generator
Generate memorable diceware passphrases from the EFF wordlists in your browser — with entropy bits, crack-time estimates, separators and extras. Free and private.
Compare Two Code Snippets
Paste two code snippets and compare them side by side, with word- or character-level highlighting, a unified patch view, and change stats.
Extract both file versions from a diff
Paste a unified diff and get both file versions back. Reconstructs the original and patched text from a git diff or .patch alone, no source file needed.
Select Hunks from a Unified Diff
Paste a unified diff, list its numbered hunks, then export selected hunks as a smaller patch, split patches, or JSON inventory.
Diff Viewer
Render a pasted unified diff as inline text, side-by-side columns, a stat summary, or structured JSON — private and browser-only.
Directory Tree View
Paste a du, find, or CSV file listing and get a clean indented tree with rolled-up folder sizes and file counts. Human, SI, or raw bytes. Free, in-browser.
Disk Usage by File Type
Paste du, find or ls output and get a sorted bar chart of disk usage by file extension or category, with size, share and file count — free and private in your browser.
Disposable Email Detector
Check if an email address or domain is a disposable or throwaway inbox (Mailinator, Guerrilla Mail, YOPmail and more) — free, private, right in your browser.
DNA / RNA Reverse Complement
Reverse-complement DNA or RNA in your browser — full IUPAC ambiguity codes, FASTA records, preserved case, complement-only and reverse-only modes. No upload.
DNS Message Parser
Decode a DNS wire-format message from hex or base64url — header flags, RCODE, question and answer records, name decompression. Free, in your browser.
Docker CLI output parser
Paste docker ps, docker images or docker stats output and get JSON, CSV, TSV, or a Markdown table. Splits CONTAINER ID, MEM USAGE / LIMIT and NET I/O correctly.
Docker Compose Generator
Write one line per service and get a validated docker-compose.yml with ports, volumes, env, networks, depends_on and healthchecks wired up.
Docstring Stub Generator
Paste a function signature and get a docstring, JSDoc, PHPDoc, Javadoc, godoc, rustdoc or YARD stub with parameter, return and raises slots ready to fill in.
Document Splitter
Split a long Markdown or HTML document into separate files, one per top-level heading. Runs entirely in your browser, no upload, no sign-up.
Document-Term Matrix Builder
Turn pasted documents into a document-term matrix. Export CSV, TSV, or JSON bag-of-words counts with binary weighting, n-grams, min document frequency, and feature caps.
DOT to Mermaid
Convert Graphviz DOT source into Mermaid flowchart syntax in your browser: nodes, edges, labels, shapes, clusters, colors and direction. Nothing is uploaded.
DOT to SVG
Render Graphviz DOT source to a clean, scalable SVG in your browser — no Graphviz install. Directed and undirected graphs, labels, dark mode. No upload.
Dotenv Manager
Parse, validate, merge and secret-mask .env files in your browser: flag duplicate and missing keys, lint names, and export .env.example or JSON. No upload.
Dotenv to Shell
Turn a .env file into export-prefixed shell statements (posix, bash, fish) — and back — with safe quoting for spaces, $, backticks and quotes. Runs in your browser.
Dotenv Validator
Paste a .env file to catch duplicate keys, unquoted spaces, malformed ${VAR} interpolation and undefined references. Runs locally in your browser.
Downsample Time-Series (LTTB)
Reduce a large time-series to a target point count with LTTB, min/max, M4, or every-nth downsampling — shape preserved, in your browser, no upload.
Analyze max drawdown and recovery time
Analyze an equity curve or return series for maximum drawdown, drawdown duration, recovery time, current drawdown, ulcer index, pain index, and top drawdown episodes.
Find duplicate columns in a table
Find duplicate columns in CSV/table data and report or remove redundant copies. In-browser, no upload.
Duplicate Row Finder
Find and report duplicate rows in a CSV or table: group them, list line numbers, and see which columns drive the duplication. Browser-local, no upload, free.
DynamoDB JSON Converter
Convert between DynamoDB typed AttributeValue JSON and plain JSON in both directions, with auto-detect and pretty or compact output.
ECDSA secp256k1 sign & verify
Generate secp256k1 keypairs and sign or verify messages with ECDSA (the Bitcoin/Ethereum curve). RFC 6979 deterministic, DER + compact — in your browser.
ECDSA sign
Sign a message with an ECDSA private key (NIST P-256 or P-384) and get a DER or raw r||s signature in base64 and hex, in your browser. Nothing is uploaded.
ECIES encrypt/decrypt
Encrypt or decrypt ECIES payloads with secp256k1, P-256, or P-384 keys, HKDF-SHA256, AES-GCM/XChaCha20, and hex/base64/PEM inputs.
Ed25519 sign & verify
Sign a message with an Ed25519 private key, or verify a signature with the public key — hex, base64, or PEM keys, entirely in your browser.
Detect Edges in an Image
Detect edges in a photo with the Canny or Sobel operator and download the edge map. Adjustable thresholds, noise blur and inverted line art, all in your browser.
eGFR Calculator
Estimate your eGFR (kidney filtration rate) from serum creatinine, age and sex with the race-free CKD-EPI 2021 equation. mg/dL or µmol/L, KDIGO stage. In your browser.
Elasticsearch Bulk Formatter
Build a compact Elasticsearch _bulk API body from a JSON array. Choose index/create/update/delete, _index, _id field, and doc_as_upsert locally.
Elasticsearch mapping generator
Paste JSON and generate an Elasticsearch mapping with text/keyword fields, date and numeric detection, nested arrays, ip, geo_point, and create-index output.
Email List Cleaner
Clean pasted email lists: validate syntax, trim and lowercase, remove duplicates, flag malformed rows, and export a copy-ready list.
Email network analyzer
Paste an mbox, .eml, or raw headers and get a sender-to-recipient network: top senders, recipients, correspondents, and links, plus CSV, JSON, GraphML, and DOT.
Email Normalizer
Normalize email addresses to canonical form — strip Gmail dots and +tags, fold googlemail.com, dedupe-ready output, free and private in your browser.
Email Obfuscator
Email obfuscator — encode your address as HTML entities, a JavaScript writer, CSS reversal, or a ROT13 mailto so spam bots can't harvest it. Free, in-browser.
Email Phishing Link Scanner
Paste an email and rate every link: display text vs real target, lookalike and punycode domains, bare-IP hosts, shorteners and redirect wrappers. Runs locally.
Email Reply Cleaner
Paste a replied or forwarded email and get just the fresh message — quoted lines, the reply chain, and signatures removed. Toggle each pass. Runs in your browser.
Email Spam Score Checker
Paste an email and get a 0-100 spam score with every rule that fired: trigger phrases, caps ratio, link density, shorteners, and header anomalies. Runs locally.
Email syntax validator
Validate email address syntax offline, flag disposable domains and role-based mailboxes, and get a pass/fail verdict with a low/medium/high risk grade.
Email Tracking Pixel Detector
Paste raw email source or HTML to find 1x1 tracking pixels, hidden remote images, known tracker domains, CSS beacons, prefetch assets, and optional click trackers.
Email Validator
Validate an email address against RFC 5321/5322 syntax in your browser — flags bad domains, illegal characters and typos like gmial.com. Free, no DNS lookup.
EML Parser
Parse a raw .eml / RFC 822 email into headers, decoded text and HTML bodies, and an attachment list — in your browser. Nothing is uploaded.
Emoji remover
Remove emoji, flags, skin tones and pictographic symbols from text, in your browser. Delete them, leave a space, or use a placeholder. Nothing is uploaded.
Emoji Search
Search emoji by keyword, :shortcode: or category and copy the glyphs instantly — happy, love, fire, rocket and more. Free, private, runs in your browser.
ENEX to Markdown Converter
Convert Evernote ENEX exports to Markdown or plain text with titles, dates, tags, source URLs, and attachment summaries — locally in your browser.
Shannon entropy calculator
Measure Shannon entropy locally: bits per character, byte, word, or line, with total information and frequency tables.
Check a CSV column against an allowed set of values
Check one CSV column against allowed categories and flag out-of-set values with counts, row locations, blank handling, and text or JSON reports.
Env File Merger
Merge up to four layered .env files in your browser and see which file set each value, with the full override chain, secret masking and ${VAR} expansion.
Env Schema Validator
Paste a .env file and a schema to catch missing, mistyped and out-of-range variables before your app boots. Rules or JSON Schema. Runs in your browser.
env to Kubernetes ConfigMap / Secret
Convert a .env file into a Kubernetes ConfigMap or Secret YAML manifest, in your browser. Base64 Secret data, namespace and labels. Free, private, no upload.
Env Var Reference Extractor
Paste a shell script, Dockerfile or config and list every environment variable it references, with line numbers, defaults and an undefined check. Runs in your browser.
ER Diagram from SQL
Paste SQL CREATE TABLE / ALTER TABLE DDL and get Mermaid erDiagram code with entities, typed columns, PK/FK/UK markers, and crow's-foot relationships.
Ethereum address from key
Derive Ethereum 0x addresses and EIP-55 checksum casing from secp256k1 private-key or public-key hex, fully locally.
EVP_BytesToKey — OpenSSL key & IV derivation
Reproduce OpenSSL's EVP_BytesToKey key and IV derivation from a password and salt (MD5, SHA-1, SHA-256, SHA-512) — free and entirely in your browser.
Smooth a series with an exponentially weighted moving average
Smooth a numeric series with an EWMA. Set alpha, span, half-life or center of mass, auto-fit alpha, forecast ahead, and export JSON, CSV or SVG.
Extract Audio from a Video
Pull the audio track out of any video as MP3 or WAV, right in your browser — pick a format and bitrate. Runs locally with ffmpeg, nothing is uploaded, free.
Extract Dates
Scan any text for dates and times and list them normalized to ISO 8601 — in your browser. Handles ISO, numeric, month-name, and clock formats. No upload.
Find & Decode Base64
Scan any text for embedded Base64 blobs and decode them — showing decoded text, or a file-type + hex preview for binaries. Runs in your browser, nothing uploaded.
Extract Domains
Extract domains from text, URLs, and emails — hostnames or registrable eTLD+1, validated against the Public Suffix List. Free, private, in your browser.
Extract Email Addresses
Pull all email addresses out of any text, deduplicated and optionally grouped by domain — in your browser. Nothing is uploaded.
Extract Video Frames to a Contact Sheet
Sample frames from a video by interval, fps or scene change and tile them into one contact-sheet image. Free, in your browser with ffmpeg, nothing is uploaded.
Extract Hashes
Pull every MD5, SHA-1, SHA-256 and SHA-512 hash out of any text, grouped by algorithm and deduplicated — in your browser. Nothing is uploaded.
Extract IP Addresses
Find, validate and deduplicate all IPv4 and IPv6 addresses in pasted text or a log — in your browser. Nothing is uploaded.
Extract MAC Addresses
Find every MAC address in pasted text or logs and normalize to colon, hyphen, Cisco dotted, or bare hex. Deduplicated, private, runs in your browser.
Extract Numbers From Text
Extract numbers from text — integers, decimals, scientific notation, signed and comma-grouped values. Filter, de-dupe, sort, and get stats in your browser.
Extract Substring
Pull out a portion of text by start/end character index, or everything between two delimiters — in your browser. Nothing is uploaded.
Extract URLs
Pull all http/https URLs out of any text, deduplicated, with an optional scheme/host/path component split — in your browser. Nothing is uploaded.
Faceted Search & Filter for JSON
Run a faceted search over a JSON dataset in your browser: filter and sort records, count every facet value, and page through the matches.
Fake Data Generator
Generate fake test data — names, emails, addresses, UUIDs and more — as CSV, JSON, SQL or XML. Up to 1000 rows, seedable. Free, in your browser.
FASTA to CSV Converter
Convert FASTA sequences to CSV or TSV in your browser — id, description, sequence and length columns, plus optional GC content and base counts. No upload.
FASTQ to FASTA Converter
Convert FASTQ sequencing reads to clean FASTA in your browser — strip quality lines, filter by length and mean quality, wrap, rename, discard N reads. No upload.
Fernet token tool
Create and read Fernet tokens (AES-128-CBC + HMAC-SHA256) in your browser: generate a key, encrypt to a url-safe token, decrypt with optional TTL. No upload.
Few-shot text classifier
Classify text from labeled examples. Choose TF-IDF, nearest-neighbor or centroid scoring, then get predictions, confidence and explanations.
FFmpeg Filtergraph Builder
Turn plain filter steps like 'scale to 720p, crop to square, fade in 1s' into a validated ffmpeg -filter_complex string, -vf chain, or full command. Nothing runs.
FFT Analyzer
Paste samples and get the frequency spectrum: magnitude, phase, dominant peaks, bin resolution and Nyquist, with windowing, dB scaling, CSV and JSON.
Field Extractor
Extract columns or character ranges from every line of text. 1-based selectors with negative indices, ranges, reordering, custom delimiters. A browser cut/awk, no upload.
File List Sorter
Sort a pasted list of filenames or paths in natural order (img2 before img10), by extension, folder depth or size, with folders first — free and private in your browser.
File Tree Generator
Turn a list of file paths or an indented outline into an ASCII tree for READMEs and docs. Unicode or ASCII connectors, optional sorting. Free, in-browser.
Files to Prompt
Bundle multiple files into one LLM-ready prompt: a directory tree, fenced file contents, and a token estimate. Free, in your browser, nothing uploaded.
Filter Lines
Keep or drop lines of text matching a substring or regular expression — a friendly grep in your browser. Nothing is uploaded.
Find Duplicate Lines
List the lines that appear more than once in pasted text, with their counts — in your browser. Optional case-insensitive and trim matching. Nothing is uploaded.
Find and Replace Text
Find and replace text with literal or regex matching, case-sensitive or not, all matches or just the first. Runs in your browser, nothing is uploaded, free.
Find Unique Lines
Return only the lines that appear exactly once in pasted text (like uniq -u) — in your browser. Optional case-insensitive and trim matching. Nothing is uploaded.
First differences and period-over-period deltas
Paste a number series and get first differences, second differences, or period-over-period change as an absolute delta, percent, ratio, or log difference.
Fiscal Quarter Mapper
Append fiscal quarter and fiscal year columns to a CSV date column for a fiscal year starting in any month. Paste a table and map every row in your browser.
FIT File Decoder
Decode a Garmin/ANT .fit activity file (pasted as base64) into a readable summary, a per-record CSV, or a GPX track — locally in your browser, no upload.
Fixed Width to CSV Converter
Convert fixed-width records to CSV. Auto-detect aligned whitespace or enter exact widths/ranges, headers, delimiters, quoting, and line endings.
Flask Session Cookie Decoder
Decode a Flask session cookie (itsdangerous) into readable JSON without the secret key — base64url, zlib payloads, signature timestamp. Free, in your browser.
Flask Session Cookie Signer
Sign Flask session cookies from a JSON payload and SECRET_KEY, with Flask defaults plus timestamp, digest, salt, and compression controls.
Flatten JSON
Flatten nested JSON into single-level dot or bracket key paths, or unflatten those paths back into nested JSON. Custom separator, CSV/pairs output, no upload.
Pick the one task to do next
Pick the single task to focus on next from a pasted to-do list. Scores priority, due dates, effort, overdue work and Eisenhower or WSJF methods locally.
Form Field Validator
Validate a whole form locally: email, phone, URL, postal code, and credit card fields with required checks, locale hints, normalization, and JSON.
CSS Formatter
Pretty-print CSS, SCSS, or LESS locally. Choose indentation, sort declarations, split selectors, and normalize hex colors in your browser.
Format Validator
Validate a value as an email address, URL, IPv4/IPv6 address, phone number, or credit card with Luhn check. Auto-detect formats locally in your browser.
Frequency distribution
Build a character, byte, or n-gram frequency table from text or hex, with counts and percentages, ranked most to least frequent — in your browser. Nothing is uploaded.
Frequency-encode a CSV categorical column
Frequency/count encode a CSV categorical column: replace each value with its occurrence count, share, percent, or log-count. Rare-category pooling, replace or append.
Frequent Contacts Ranker
Paste an mbox export and rank who you email most, weighted by frequency and recency. Export a paste-ready contact list, CSV or JSON — all in your browser.
Full Text Search
Search pasted documents with BM25 or TF-IDF ranking, stemming, stopwords, phrase and exclusion queries, and highlighted snippets.
Analyze a conversion funnel
Paste an event CSV and compute funnel conversion and drop-off rates per step. Unique users, conversion from top and previous step — in your browser, no upload.
Fuzzy CSV Join
Join two CSV tables on approximately matching key values, with similarity scores, join modes, unmatched-row reports and multiple matching algorithms.
Fuzzy Dedupe
Remove near-duplicate rows or lines (typos, casing, spacing) that exact de-duplication misses, and keep one clean row per group.
Fuzzy Text Search
Paste text and fuzzy-search it — find the best-matching lines even with typos, ranked by relevance with the matches highlighted. Runs in your browser, no upload.
Fuzzy Name Matcher
Match and deduplicate person or organization names with Jaro-Winkler, Levenshtein and Soundex. Paste names, tune the threshold, export groups, pairs, CSV or JSON.
Gamma Correct an Image
Apply gamma correction to image midtones in your browser, with per-channel gamma, highlight protection and PNG/JPG/WebP output options.
Gantt chart generator for Mermaid
Turn a task list with start dates, durations and dependencies into Mermaid gantt chart code. Sections, milestones, weekend exclusions and Markdown fencing.
Find missing numbers and gaps in a sequence
Paste invoice numbers, order IDs, cheque numbers, or any sequence that should be consecutive to find missing values, gap ranges, and duplicates.
Google Drive Link Converter
Turn a Google Drive share link into a direct-download, embed, preview, or thumbnail URL — or extract the file ID. Handles large-file scan warnings.
HOTP generator
Generate counter-based one-time (HOTP, RFC 4226) codes from a base32 secret and a counter, in your browser. The secret never leaves your device.
UUID Generator
Generate UUIDs / GUIDs online: v4 (random), v7 (time-ordered), v1, and v5/v3 (namespace), one or in bulk. Runs entirely in your browser — nothing uploaded, free.
Convert VCF Variants to TSV
Flatten Variant Call Format (VCF) records into tidy TSV, exploding INFO fields and optional sample genotype columns. Runs locally in your browser.
Geo Cluster
Cluster latitude and longitude points by real ground distance with DBSCAN or a grid. Get cluster assignments and centroids, entirely in your browser.
Point in Polygon Checker
Test latitude/longitude points against a polygon geofence. Paste GeoJSON or lat,lon lines, choose boundary handling, and export text, CSV, or JSON.
GeoJSON Coordinate Extractor
Extract every coordinate in a GeoJSON file into a flat longitude,latitude CSV — one row per vertex, with elevation, rounding, dedupe and lat/lon order options.
GeoJSON formatter and minifier
Format GeoJSON locally: pretty-print, minify, round coordinates, reorder keys, add bbox, fix winding, and prune properties.
GeoJSON Merge
Merge multiple GeoJSON files, features, or geometries into a single FeatureCollection. Round coordinates, renumber ids, tag by source — in your browser, nothing uploaded.
Query GeoJSON Features
Filter, project, sort, page, and aggregate GeoJSON features with property predicates, bbox filters, and simple spatial functions.
GeoJSON to CSV Converter
Flatten GeoJSON features into CSV rows with property columns, WKT or longitude/latitude geometry, nested-field flattening, and delimiter options.
GeoJSON to SVG
Render GeoJSON to a scalable SVG map in your browser — polygons, lines and points, Web-Mercator or raw lon/lat, custom colours. No tile server, no upload.
GeoJSON validator
Validate GeoJSON in your browser. Report every structural error, polygon winding violation, and out-of-range coordinate with a JSON path.
Convert GeoJSON, WKT, and WKB Geometries
Convert geometries between GeoJSON, WKT/EWKT, and WKB/EWKB with SRID, precision, endian, and multi-feature controls.
Geometry Calculator
Geometry calculator for area, perimeter, surface area and volume — squares, triangles, circles, spheres, cylinders, cones and more. Free, private, in-browser.
GIF to MP4 / WebM
Convert an animated GIF into a much smaller MP4 or WebM video, right in your browser. Re-encodes locally with ffmpeg (H.264 / VP9), nothing is uploaded, free.
Glob Filter
Filter a pasted path list with glob or gitignore-style include and exclude patterns, then preview matched, unmatched, or annotated results.
Gmail Takeout mbox → CSV / JSON
Turn a Google Takeout Gmail .mbox export into CSV or JSON — one row per message with date, from/to/cc, subject and Gmail labels. In-browser, no upload.
GOST Kuznyechik cipher
Encrypt or decrypt text with the GOST Kuznyechik cipher (GOST R 34.12-2015) in CBC, CTR, CFB, OFB or ECB mode — 256-bit key, hex/base64 I/O, in your browser.
GOST Magma cipher
Encrypt or decrypt text with the GOST 28147-89 Magma 64-bit block cipher — ECB or CBC, 256-bit key, hex or base64 — free and entirely in your browser.
GPX Analyzer
Paste a GPX file to get total distance (km and miles), elevation gain/loss, duration, average speed and pace — in your browser. Nothing is uploaded.
GPX Merge
Merge several GPX files, tracks, routes and waypoints into one GPX 1.1 file, ordered chronologically by timestamp. Runs in your browser; nothing is uploaded.
GPX Privacy Scrubber
Scrub a GPX file before sharing it: remove or fuzz start/end locations, rewrite timestamps, and strip sensor extensions. Runs locally in your browser.
GPX Simplifier
Paste a GPX track and reduce its point count with Douglas-Peucker tolerance in meters while preserving route shape, endpoints, elevation and times.
GPX Splitter
Split a GPX track into multiple segments by distance, elapsed time, or detected stop gaps. Output a new GPX or a per-segment summary locally in your browser.
GPX to CSV Converter
Convert a GPX track, route or waypoints to clean CSV in your browser — latitude, longitude, elevation, time, derived speed and sensor data. Free, private, no upload.
GPX / KML to GeoJSON Converter
Convert GPX or KML GPS tracks and waypoints into GeoJSON, or GeoJSON back into GPX, entirely in your browser. Free, private, no upload.
GPX to KML Converter
Convert GPX tracks, routes, and waypoints into KML for Google Earth. Set line color, width, opacity, waypoint color, and altitude mode locally.
Grade to GPA Parser
Paste letter grades, credits, and weighted-course tags to calculate GPA on a 4.0, 4.3, 5.0, or custom scale.
Graph Algorithms
Run graph algorithms on your own edge list — BFS, DFS, Dijkstra shortest path, topological sort, and cycle detection. Free, private, in your browser.
GraphQL formatter
Format, minify, and validate GraphQL queries, mutations, fragments, and SDL schemas in your browser.
Generate mock JSON from a GraphQL SDL schema
Paste GraphQL SDL and get deterministic mock JSON: every type, one named type, or a {"data": ...} query response with seed, depth and null controls.
Detect hidden color pixels in an RGB image
Paste image bytes and check whether every RGB pixel is effectively grayscale, with tolerance, color-pixel counts, and sample coordinates.
Guitar Tab to MIDI
Paste ASCII guitar or bass tablature and download a real Standard MIDI File — tuning presets, capo, transpose, tempo, note length and GM instrument.
Gzip & Brotli Size Estimator
See the gzip and brotli compressed size of any code or text — raw bytes, bytes saved, percent reduction and ratio. Free, private, runs in your browser.
HAR Body Stripper
Remove request and response bodies from a HAR capture to shrink it and clear payloads before sharing. Filter by side, mimeType, or size — all in your browser.
HAR Redactor
Replace HAR cookies, auth headers, query tokens, and bodies with a placeholder while keeping the capture valid and viewer-friendly.
HAR Request Extractor
Extract every request from a HAR capture — method, URL, status, type, size, timing — as a table, CSV, JSON, or URL list. Filter and sort, all in your browser.
HAR to OpenAPI
Convert a HAR capture into a draft OpenAPI 3.0/3.1 spec in your browser. Infers paths, methods, params, and request/response JSON schemas.
HAR Validator
Validate a HAR file against the HAR 1.2 spec: log/entries shape, request/response/timing fields, exact JSON paths, and timing totals.
Hash All Generator
Hash text with every common algorithm at once — MD5, SHA-1, SHA-256/512, SHA-3, BLAKE3, RIPEMD-160, CRC-32 and more — free and private in your browser.
Hash Identifier
Paste a hash and instantly identify its likely algorithm — bcrypt, Argon2, MD5, SHA-1/256/512, NTLM, sha512crypt, PHPass and more. Runs entirely in your browser.
Hash IOC Matcher
Hash text, hex or base64 content and match its MD5/SHA-1/SHA-256/SHA-512 against a pasted blocklist of known-bad IOC hashes. Free, private, in-browser.
Text Hash Generator
Generate MD5, SHA-1, SHA-256/512, SHA-3, BLAKE2 or BLAKE3 hashes of any text in your browser, with hex or base64 output. Free, private, nothing uploaded.
HCL to JSON
Convert HashiCorp HCL2 / Terraform configuration to JSON. Handles blocks, labels, repeated blocks, expressions, sorting, compact or pretty output.
BIP32 HD Key Derivation
Derive BIP32 child private keys, xpubs, WIF keys, and Bitcoin mainnet/testnet P2PKH or SegWit addresses from a seed or xprv. Private and offline in your browser.
Head — First N Lines
Get the first N lines of any text in your browser — like head -n. Choose the line count, skip a header row, number each line. Free, private, no sign-up.
Hex Byte Inspector
Inspect hex, Base64 or text: byte, bit and hex-char length, conversions, grouping, and crypto-size hints. Free, runs in your browser.
Hex Encoder / Decoder
Encode text to hex and decode hex back to text in your browser. Delimiters, uppercase, and 0x prefixes; tolerant decoding accepts any format. Free and private.
Histogram Bin Calculator
Work out how many bins a histogram needs. Compare Sturges, Scott, Freedman-Diaconis, Rice and square-root, then get the bin edges, counts and percentages.
Histogram Chart Maker
Paste a list of numbers and render an SVG histogram. Auto bin rules or an explicit bin count/width, count, percent, density or cumulative bars, mean and median markers.
HKDF key derivation
Derive keys with HKDF, the HMAC-based extract-and-expand KDF from RFC 5869 — choose hash, salt, info label, length and hex/base64 output, all in your browser.
HL7 v2 Message Parser
Parse an HL7 v2.x message into named segments, fields, components and subcomponents in your browser. MSH, PID, OBX and more, as JSON or CSV. No upload, free.
HMAC Generator
Generate an HMAC of any message and secret key in your browser — HMAC-SHA256, SHA-1, SHA-512, SHA-3 or MD5, hex or base64 output. Free and private.
HMAC Verify
Verify an HMAC tag against a message and secret key using a timing-safe comparison. Supports SHA-256, SHA-512, SHA-1, MD5, hex, and base64.
Remove HTML Comments
Strip HTML comments from markup and change nothing else. Keeps IE conditional, SSI and licence-banner comments by default. Free, runs in your browser.
HTML Diff
Compare two HTML snippets by their visible text, ignoring tag and attribute noise.
HTML Email to Text
Convert HTML email to readable plain text: strip tags, keep paragraphs and lists, render links inline or as footnotes, and optionally wrap lines.
HTML Entity Decoder
Decode HTML character entities to plain text — named (&, ©, —), decimal (©), and hex (©) references in your browser.
HTML Entity Encoder
Encode text into HTML character entities — pick a scope (minimal, all non-ASCII, or every named character) and a format (named, decimal, or hex). Runs in your browser.
Extract Data from HTML with a CSS Selector
Paste HTML, type a CSS selector, and pull out the text, inner/outer HTML, or an attribute from every match. Runs in your browser, nothing uploaded, free.
Extract Every Field From an HTML Form
Paste HTML and get every form field: name, id, type, label, required flag, default value, and validation rules, as JSON, Markdown, or CSV. Runs in your browser.
HTML Form Generator
Generate clean, accessible HTML form markup from a plain field list — labels, validation, selects, radios and textareas. Free, private, in-browser.
HTML Formatter
Pretty-print and beautify HTML with consistent indentation, in your browser. Handles void elements, comments, and preserves pre/script/style. Nothing is uploaded.
Inventory Every Image in Your HTML
Paste HTML and list every img and picture source with alt text, width, height, loading hints, and flags for missing alt or dimensions. Runs in your browser.
HTML Minifier
Minify HTML by collapsing whitespace and removing comments, in your browser. Preserves pre/script/style and significant inline spacing. Nothing is uploaded.
Analyze an HTML Heading Outline
Paste HTML to extract the H1-H6 heading outline, flag outline issues, and count the element tags written in the source.
HTML Preview Bundler
Combine separate HTML, CSS, and JS into one self-contained, runnable HTML file you can open or share — in your browser. Nothing is uploaded.
HTML Sanitizer
Sanitize pasted HTML into safe allowlisted markup or plain text by removing scripts, event handlers, unsafe URLs, and risky tags locally in your browser.
Extract Tables from HTML
Paste HTML and pull out any <table> as clean CSV or JSON. Pick the table and output format. Runs in your browser, nothing is uploaded, free.
HTML to JSX Converter
Convert HTML to React JSX in your browser: class becomes className, inline styles become style objects, void tags self-close, comments become JSX.
HTML to Markdown
Convert HTML into clean Markdown instantly in your browser — preserves headings, links, lists, code blocks, tables, and emphasis. Free, private, no upload, no sign-up.
HTML to Text
Strip HTML markup to clean, readable plain text in your browser — keeps paragraph and list structure, removes all tags. Free, private, no upload, no sign-up.
HTML Validator
Validate an HTML document or snippet and get every syntax error, unclosed tag, and nesting issue with line and column — runs locally in your browser.
HTTP Header Analyzer
Paste HTTP response headers for a plain-English explanation of each, an A+–F security grade, and missing security headers. Free, private, in your browser.
HTTP Header Normalizer
Canonicalize a pasted HTTP header block: Title-Case names, trimmed values, merged duplicates, sorted lines, optional redaction and a curl -H form. Free, in your browser.
HTTP Header Parser
Paste a raw HTTP request or response header block and get a structured, case-normalized JSON map. Fold duplicates, pick the name casing. Free, in your browser.
HTTP Headers Diff
Compare two sets of HTTP headers and see what changed: headers added, removed and changed, with case-insensitive names and noise-header ignore. Runs in your browser.
HTTP Request Builder
Build a well-formed raw HTTP/1.1 request from a method, URL, headers, and body — in your browser. Nothing is sent. Great for netcat, teaching, and debugging.
Human Readable Units
Turn raw byte counts, durations and big numbers into readable units — 1500000000 to 1.5 GB, 123 seconds to 2m 3s, 1200000 to 1.2M. Runs in your browser.
IAM Policy Linter
Lint AWS IAM policy JSON locally for syntax errors, wildcard permissions, public principals, NotAction/NotResource risks and sensitive actions on Resource *.
Extract & Validate IBANs
Paste an invoice, email or statement and pull out every IBAN, each checked with the ISO 13616 mod-97 checksum — in your browser. Nothing is uploaded.
IBAN Validator
Validate an IBAN with the mod-97 checksum and parse out the country, bank, and account — instantly, in your browser. Nothing is uploaded, free.
ICS Agenda View
Paste an iCalendar .ics file to render a day-by-day agenda, expand common recurrences, convert timezones, and list free gaps between meetings.
ICS Merge & Dedupe
Merge several .ics calendar files into one and remove duplicate events by UID or start+title — all in your browser. Free, private, nothing uploaded.
ICS Parser
Parse .ics calendar files into JSON events with start/end, all-day status, location, attendees, organizer and RRULE recurrence. Runs in your browser.
ICS Timezone Shifter
Rewrite DTSTART and DTEND values in an .ics calendar from one timezone to another, preserving all-day events and emitting TZID, UTC, or floating output.
ICS to CSV Converter
Convert an .ics calendar file to CSV in your browser — one row per event with summary, start, end, location and description. Free, private, nothing uploaded.
Auto-Rotate a Photo to its Correct Orientation
Fix sideways and upside-down photos: reads the EXIF orientation flag, bakes the rotation into the pixels, and drops the tag. Runs in your browser, free.
Remove an Image Background with AI
Remove the background from people, products, animals, vehicles, and other foreground subjects locally in your browser.
Replace an Image Background (Chroma Key)
Chroma-key a green-screen or solid-color background out and drop the subject onto a transparent, solid, or gradient background — free, in your browser.
Compress an Image
Shrink an image's file size right in your browser — re-encode a JPG, PNG, or WebP at a chosen quality, same format out. No upload to a server, runs locally, free.
Convert an Image
Convert any image to JPEG, PNG, or WebP right in your browser — pick a target format and quality. No upload to a server, runs locally, free.
Crop an Image
Crop any image right in your browser — set the x/y offset and the width/height of the rectangle to keep. No upload to a server, runs locally, free.
Dither an Image
Apply Floyd-Steinberg, ordered (Bayer) or Atkinson dithering to any image. Pick a 1-bit, e-ink grayscale, retro or custom palette. Runs in your browser, free.
Add a Drop Shadow to an Image
Add a realistic soft drop shadow behind a transparent PNG cutout — set offset, blur, color and opacity. Runs in your browser, nothing is uploaded, free.
Add Film Grain to an Image
Add realistic analog film grain to a photo, right in your browser — adjustable amount, neutral or colored grain, optional format convert. Nothing is uploaded, free.
Convert an Image to Grayscale
Convert any image to grayscale instantly in your browser. No upload to a server, runs locally, completely free.
Remove Image Noise with a Median Filter
Clean salt-and-pepper dots, scanner dust and speckle out of a photo with a median filter that keeps edges sharp. Adjustable window, channels and passes, in your browser.
Perspective Warp an Image
Apply a four-corner perspective transform to a photo — straighten skewed documents or add tilt with pixel corners and W/H edge constants.
Resize an Image
Resize any image right in your browser — set a width and/or height, pick a fit mode. No upload to a server, runs locally, free.
Compress an Image to a Target File Size
Compress a JPG or WebP to a target file size in KB. Enter a KB budget and it searches the best quality that fits — all in your browser, nothing uploaded, free.
Shrink an Image for Sharing
Downscale, strip EXIF metadata, and compress a photo in one step for messaging, email or upload. Runs locally in your browser — nothing is uploaded, free.
Add a Vignette to an Image
Add a dark, light or colored vignette around the edges of a photo, right in your browser — adjustable strength, center and output format. Nothing is uploaded, free.
Tiled Image Watermark
Stamp a repeating tiled watermark across an entire photo. Pick text, size, color, opacity, diagonal angle and tile density. Runs in your browser.
Import & Dependency Graph Extractor
Paste JS, Python, Rust, or Go source and get an import graph with file edges, external deps, dependents, orphans, leaves, and cycles.
Indent Block Text
Indent, outdent, dedent, or prefix every selected line of a text block with spaces, tabs, or custom text.
Index of Coincidence Calculator
Calculate the Index of Coincidence (IC) of any text — spot monoalphabetic vs polyalphabetic ciphers and estimate a Vigenère key length. Free, in your browser.
INI / .env Diff
Compare two .env or .ini config files key-by-key: added, removed and changed settings, with case-folding and secret masking.
INI ⇄ JSON Converter
Convert INI/conf files to JSON and JSON back to INI, or get, set and delete a single key while keeping comments, blank lines and key order intact.
INI Parser
Convert INI/conf files to structured JSON, handle sections, comments and quoted values, and report duplicate keys locally in your browser.
Defang / Refang IOCs
Defang or refang IOCs in your browser: turn http://evil.com into hxxp[://]evil[.]com so URLs, IPs, domains and emails are safe to share. Free, private.
IOC Extractor
Extract IOCs from threat reports in your browser — IPs, URLs, domains, emails, MD5/SHA hashes — with defanged (hxxp, [.]) input support. Free, private, no sign-up.
IP Address Validator
Validate a list of IPv4/IPv6 addresses, get the RFC 5952 canonical form, the type (private, loopback, multicast…) and why anything failed. Runs in your browser.
IP Log Anonymizer
Anonymize IPv4 & IPv6 addresses in a log in your browser: GA/Matomo-style masking, salted SHA-256 pseudonyms, or fixed redaction. Ports & timestamps kept. Free, private.
IP Range Expander
Expand a CIDR block (192.168.1.0/24) or start-end IP range into the full list of addresses, or just count them — IPv4 and IPv6, free and private in your browser.
IP Range to CIDR
Convert a start-end IP range like 10.0.0.5-10.0.0.20 into the minimal set of CIDR blocks that exactly covers it — IPv4 and IPv6, free and in-browser.
Convert IPYNB to Markdown
Convert Jupyter .ipynb JSON to Markdown with fenced code blocks, markdown cells, outputs, errors, HTML tables, and embedded image data URIs. Browser-only.
ipynb to Script
Extract code cells from a Jupyter .ipynb into a clean Python script or Markdown, dropping outputs and execution counts. Runs locally in your browser.
IQR Outlier Trimmer
Drop the CSV rows outside Q1-k*IQR to Q3+k*IQR on a column you choose. Adjustable k, winsorize or flag instead, quartile stats. Free, in-browser, no upload.
IRC Log Parser
Parse raw IRC logs from WeeChat, irssi, mIRC, ZNC or HexChat into a readable timeline, or export them as JSON, NDJSON, CSV or a Markdown table.
ISO 9660 TOC List
List an ISO 9660 disc image's volume label, directory tree and file sizes from base64 data without extracting files. Browser-local and read-only.
Issue Export Reporter
Paste a Jira or Linear CSV issue export to get status breakdowns, lead and cycle-time percentiles, velocity per sprint, and a burndown. Runs in your browser.
iTunes Library XML Parser
Parse an iTunes or Music Library.xml in your browser and export playlists and track metadata as CSV, TSV, JSON, M3U or a library summary.
JA3 Fingerprint Calculator
Compute the JA3 and JA3N fingerprints (string + MD5 hash) of a TLS ClientHello from pasted hex, GREASE removed — free and local in your browser.
JA4S Fingerprint Calculator
Compute a JA4S server fingerprint from a TLS ServerHello in hex — the JA4+ server hash of version, ALPN, cipher, and extensions. Nothing is uploaded.
JMESPath Query Tool
Filter and reshape JSON with a JMESPath expression locally in your browser, including AWS CLI --query style projections, filters, functions, and raw output.
Parse a job posting into structured fields
Extract title, company, location, salary, skills, work mode, and experience level from pasted job ads.
Join Lines
Join lines of text into one line with any separator — comma, space, tab or custom. Trim, drop blanks, add a prefix/suffix. Free, runs in your browser.
Run jq on JSON
Run a jq program against any JSON document right in your browser — filter, map, select, reshape. Pure-Rust jq (jaq), nothing is uploaded, free.
JavaScript Beautifier
Re-indent minified or obfuscated JavaScript into clean, readable source — strings, regex and comments preserved. Free, in your browser; nothing uploaded.
JavaScript & CSS Minifier
Minify JavaScript or CSS and see byte savings. Auto-detects language, strips comments and whitespace, keeps license banners, runs locally.
JavaScript Minifier
Minify JavaScript online: strip whitespace, line breaks and comments without changing behavior — strings and regex kept verbatim. Free, in-browser, no upload.
JSON Array Pluck Field
Paste a JSON array, wrapper object, or NDJSON and extract one key or dotted path from every row as lines, CSV, TSV, JSON, or a custom-delimited list.
JSON Assertion Runner
Run JSONPath assertions against a JSON payload and get a pass/fail report for tests, fixtures, and API responses.
JSON Beautifier
Pretty-print minified or messy JSON with configurable indentation (or minify it), validating it in the process. Runs in your browser; nothing is uploaded.
Convert stringified JSON values back to real types
Paste JSON where every value is quoted and get real types back: numbers, booleans and nulls. Protects ZIP codes, big integers and chosen keys.
JSON Array Deduplicator
Remove duplicate elements from a JSON array: compare whole values or chosen key fields, keep the first or last occurrence, or list the duplicates instead.
JSON Diff
Compare two JSON documents and see exactly what was added, removed or changed, with full JSON paths — in your browser. Nothing is uploaded.
JSON Error Locator
Paste broken JSON and get the exact line, column and cause of every syntax error, with a caret-marked snippet and a suggested fix. Runs in your browser.
JSON Escape / Unescape
Escape or unescape special characters in a string for safe use inside JSON — quotes, backslashes, newlines, control chars. Runs in your browser; nothing uploaded.
Extract JSON from Logs
Paste mixed log or console text and extract embedded JSON objects and arrays — validated, pretty-printed, and separated into blocks in your browser.
JSON Key Case Converter
Rename every JSON key to camelCase, PascalCase, snake_case, kebab-case or SCREAMING_SNAKE_CASE. Values stay untouched. Runs in your browser.
JSON-LD Schema Markup Generator
Generate schema.org JSON-LD structured data for Article, Product, FAQ, Organization, Event, Recipe and more — a ready-to-paste script tag, free in your browser.
Format and filter structured JSON logs
Pretty-print JSON log lines, flatten nested fields, filter by level or field, and export readable logs as text, table, JSON, or CSV.
JSON Mask
Prune a JSON document to just the fields you name with a mask like a,b(c,d) — the Google Partial-Response syntax. Free, in your browser.
JSON Merge
Deep-merge two or more JSON objects, with configurable array handling and last-wins conflict resolution — in your browser. Nothing is uploaded.
JSON entity normalizer
Normalize deeply nested JSON into id-keyed entity tables plus a result id, using a compact entity schema and deterministic local WASM.
JSON Path Editor
Get, set, or delete a value at a dotted or bracketed path in a JSON document. Supports array indices, quoted keys, and auto-created intermediates.
JSON Redact
Detect and mask secrets — API keys, tokens, passwords, private keys and emails — in a JSON document before sharing. Structure-aware, in your browser, nothing uploaded.
JSON Null Remover
Recursively remove null values from JSON, and optionally empty strings, arrays and objects. Compact or keep array positions, pretty-print or minify.
JSON Repair
Fix broken JSON automatically — trailing commas, single quotes, unquoted keys, missing commas, comments, truncated LLM output. Runs in your browser.
JSON Schema Batch Validator
Validate a JSON array or NDJSON batch against one JSON Schema. Get a pass/fail summary plus per-record errors with JSON Pointer paths — locally in your browser.
JSON Schema compatibility check
Compare old and new JSON Schemas for consumer/backward and producer/forward compatibility. Flags enum, type, required-field, object, array, and bound changes.
Generate fake data from a JSON Schema
Generate deterministic fake JSON, JSONL, or CSV rows from a JSON Schema subset with formats, enums, ranges, arrays, and seeds.
Generate a sample JSON instance from a JSON Schema
Paste a JSON Schema and get a minimal valid example JSON instance. Honors required, default, const, enum, examples, $ref, allOf and formats. Runs in your browser.
JSON Key Sorter
Recursively sort JSON object keys A→Z or Z→A for clean diffs. Supports case-insensitive sorting, optional array sorting, and indent or minify.
JSON structure analyzer
Analyze a JSON document's structure: max nesting depth, node counts, key frequency, per-path types, and array stats — in your browser. Free, private, no upload.
Convert JSON to a DynamoDB BatchWriteItem payload
Convert a JSON array of objects into a DynamoDB BatchWriteItem request payload with typed AttributeValues. Put or delete, pretty or compact, up to 25 items.
JSON to Graph
Turn JSON into a node-link graph as Mermaid flowchart or Graphviz DOT. Collapse deep branches, cap arrays and generate paste-ready diagram source in your browser.
JSON to HTML Table
Render a JSON array or object as a clean HTML table or Markdown table with nested-value controls.
JSON to JSON Schema
Paste JSON and get a JSON Schema — types, required fields, unions, and formats (email, uri, date-time, uuid) inferred. Draft 2020-12 or Draft-07, in-browser, free.
JSON to Markdown Converter
Convert JSON exports, API responses or config files into nested Markdown. Objects become bullets and headings; arrays become tables or lists.
JSON → SQL INSERT Generator
Turn JSON objects or arrays into SQL INSERT statements — MySQL, Postgres, SQLite, SQL Server, or ANSI, with literals or placeholders.
JSON to TypeScript
Paste JSON and get TypeScript interfaces — nested types, optional fields, and unions inferred automatically. Runs in your browser, nothing is uploaded, free.
JSON to XML Converter
Convert JSON to well-formed XML with configurable root and array item names, attributes, text nodes, pretty printing, and an optional XML declaration.
JSON Transform Rules
Reshape JSON with declarative target = selector rules, JSONPath-style selectors, defaults, transforms, merge mode, and a rule report.
Trim the whitespace from every string in a JSON document
Paste JSON and trim the whitespace off every string value at any depth. Collapse inner runs, catch non-breaking spaces, and optionally trim object keys.
JSON ⇄ YAML ⇄ TOML
Convert config data between JSON, YAML, and TOML in any direction — in your browser. Round-trips through a common model. Nothing is uploaded.
JSON ⇄ YAML Converter
Convert between JSON and YAML in either direction, right in your browser. Auto-detects the input format. Nothing is uploaded, free.
JSON5 / JSONC ⇄ JSON Converter
Convert JSON5 or JSONC to strict JSON — strip // comments and trailing commas, quote keys — or turn plain JSON back into JSON5. Private, in-browser, free.
Query & transform JSON with JSONata
Run a JSONata expression against any JSON document right in your browser — query, filter, aggregate, and reshape JSON. Pure-Rust engine, nothing is uploaded, free.
Deduplicate JSONL / NDJSON records
Remove duplicate records from JSONL / NDJSON text — de-duplicate by whole-line equality or chosen key fields, keep the first or last, all in your browser.
JSONL stats
Summarize JSON Lines records: record count, per-key coverage, value-type distribution, distinct counts, samples, and numeric/string stats.
JSONPath Query
Evaluate JSONPath expressions (RFC 9535) against any JSON in your browser — wildcards, slices, recursive descent, filters. Free, private, nothing uploaded.
JWK Thumbprint
Compute the RFC 7638 SHA-256 thumbprint of a JSON Web Key — the canonical kid — in your browser. Supports RSA, EC, OKP, and oct keys. Nothing is uploaded.
JWT Claims Diff
Decode two JWTs offline and see exactly which claims were added, removed or changed — with human-readable expiry deltas. Nothing leaves your browser.
JWT decode
Decode any compact JSON Web Token (JWT) offline to inspect its header, payload claims, signature, and time-based validations. No data leaves your device.
JWT sign
Sign a JSON Web Token (JWT) from a payload with HS256/384/512, RS256/384/512 or ES256/384 in your browser. The secret and key never leave your device.
JWT verify
Verify a JWT signature (HS256/384/512, RS256/384/512, ES256/384) and its exp, nbf, iss and aud claims in your browser — token and key never leave your device.
Check a JWT for security weaknesses
Audit a JSON Web Token offline: alg:none, weak or guessable HMAC secrets, missing or expired expiry, absent iss/aud claims — each finding scored.
Kubernetes Manifest Generator
Fill in a name, image and ports to generate a Kubernetes Deployment plus matching Service, with resources, env, labels and probes.
Kubernetes Manifest Splitter
Split helm template, kustomize or kubectl YAML bundles into per-resource files, an index, JSON, kustomization.yaml or a shell script.
Build a kanban board from a task list
Paste a task list or messy notes and get a kanban board: columns, cards, assignees, priorities, due dates and WIP limits, as Markdown sections, a table, or JSON.
Keccak-256 Hash Generator
Compute the original Keccak-256 or Keccak-512 hash of any text in your browser — the exact hash Ethereum uses, not FIPS SHA-3. Free and private.
Keep to Markdown
Convert a Google Keep Takeout export (JSON or HTML) into Markdown notes — labels, checkboxes, dates and pinned/archived flags preserved. Free, in your browser.
Key derivation function
Derive a key of any length from a passphrase or seed with PBKDF2, scrypt, Argon2id, or HKDF — hex or base64, in your browser. Nothing is uploaded.
Key-value text parser
Parse messy key: value or key=value text into JSON, grouping repeated keys, splitting blank-line records, and preserving ordered pairs with line numbers.
KML / KMZ to GeoJSON Converter
Convert KML or KMZ map data into GeoJSON — or GeoJSON back into KML — entirely in your browser. Free, private, no upload, no account.
Kruti Dev to Unicode Converter
Convert legacy Hindi Kruti Dev 010 font text to standard Unicode Devanagari (Mangal font) and vice versa. Safe, offline, client-side conversion.
CSV to LaTeX table
Convert CSV or TSV data into a LaTeX tabular environment (booktabs, grid, or plain), in your browser. Free, private, no upload.
LaTeX → MathML Converter
Convert LaTeX math to MathML in your browser — accessible <math> markup for HTML, EPUB and Office, with block or inline mode and pretty-print. Free, private.
Lazy-load Attribute Adder
Add loading="lazy" and decoding="async" to HTML img and iframe tags that lack them, while preserving the rest of the markup.
Convert LDAP LDIF exports to CSV
Paste an LDAP LDIF export and flatten entries into CSV rows, with DN, repeated attributes, base64 values, changetype records and delimiter controls.
Least Squares Regression Calculator
Fit linear, quadratic, or polynomial least-squares models to pasted x,y data. Get coefficients, R², residuals, predictions, CSV, and JSON — all locally.
Ledger Balance
Paste a ledger-cli or hledger plain-text journal and get the balance of every account and sub-account, as a tree, CSV, JSON or Markdown. Runs in your browser.
Ledger Register
Paste a ledger-cli or hledger plain-text journal and list matching postings with running totals, filters, CSV, JSON and Markdown output. Runs in your browser.
Adjust Levels for Numeric Samples
Apply a Photoshop/GIMP-style Levels transfer curve to numeric samples: set input black/white points, midtone gamma, and output black/white levels.
License Checker
Check SPDX licenses in an SBOM or dependency list against allow/deny rules. Supports CycloneDX, SPDX, npm-style JSON, CSV-ish lists, JSON/CSV output.
Likert Scale Summary
Summarize Likert survey answers: item means, SD, median, mode, distributions, top/bottom-box percentages, and text stacked bars. Runs in your browser.
InfluxDB Line Protocol ⇄ CSV Converter
Convert InfluxDB line protocol to CSV and CSV back to line protocol in your browser. Annotated CSV, tag/field mapping, RFC3339 or Unix timestamps. No upload.
Fill the gaps in a number series by linear interpolation
Paste readings with blanks or NA markers and fill gaps by linear interpolation. Cap run length, choose direction, and control edge gaps.
Link Extractor
Extract every hyperlink and in-page anchor from pasted HTML or Markdown — URL, link text, relative-link flags, text or JSON output. Free, in your browser.
List Converter
Convert, clean and sort lists online — comma-separated to lines, SQL IN, JSON, XML or custom delimiters, with prefix, dedupe and case options. Free, in-browser.
Merge Two Lists & Remove Duplicates
Merge two lists into one deduplicated list and see how many overlaps were collapsed. Append or interleave, ignore case, trim, and sort. Runs in your browser.
Compare Two Lists
Compare two lists as sets and see which items are only in A, only in B, or shared — with counts. Ignore case, trim, dedupe, and leading zeros. Runs in your browser.
Location History Parser
Turn Google Takeout or Dawarich location-history JSON into per-day places visited and distance traveled. Text, CSV, or JSON; km or miles.
Log Analyzer
Free log analyzer — paste JSON/NDJSON, logfmt, syslog or Apache/nginx logs and get level counts, grouped top errors, time span, and a volume timeline.
Log Merger
Merge multiple log files into one timeline sorted by timestamp, with a [source] tag on every line. Free, private, runs in your browser — nothing uploaded.
Log Parser
Free log parser — auto-detects JSON/NDJSON, logfmt, syslog and Apache/nginx access logs into a filterable table, JSON, or CSV. Runs in your browser, no upload.
Log Pattern Miner
Cluster thousands of raw log lines into a handful of ranked message templates with counts. Drain-style mining, typed placeholders. Free, in your browser.
Log return calculator
Paste a price series and get continuously compounded log returns per period, cumulative and total log return, volatility, and annualized figures as text, CSV or JSON.
Log Timestamp Normalizer
Paste logs whose timestamps are in ISO-8601, epoch, syslog or Apache format and get one format, one timezone and the gap between events. Free and private.
Log to Metrics
Turn JSON, logfmt or CSV logs into per-group counts, throughput rates, error rates and exact p50/p95/p99 latency. Table, JSON, CSV or Prometheus output.
Log to Table
Turn semi-structured log lines into a Markdown table, CSV, TSV, or JSON using named regex groups and presets for Apache, syslog, and log4j-style logs.
Logfmt Converter
Convert log data between logfmt, JSON, NDJSON and CSV in any direction — auto-detects the source, infers types, writes real logfmt. Free, in-browser.
Loop a Video
Loop a video or GIF into one continuous file — repeat it N times or fill a target duration, free and in your browser with nothing uploaded.
Lua Formatter
Format, beautify and re-indent Lua source in your browser. Configurable indent width or tabs, optional quote-style normalization, comments preserved. Nothing is uploaded.
Lua Minifier
Paste Lua source and strip comments and whitespace, preserve license banners, keep or strip line breaks, and optionally rename locals.
Luhn Check Digit Calculator
Compute the Luhn (mod-10) check digit for a partial number and get the completed, valid number — instantly, in your browser. Nothing is uploaded, free.
Luhn Validator
Validate a credit card, IMEI, or any number against the Luhn check-digit algorithm — instantly, in your browser. Nothing is uploaded, free.
LZ-String Compress / Decompress
Compress and decompress text with LZ-String in your browser — Base64, URL-safe, or UTF-16 output, byte-compatible with the lz-string JS library. Free, private.
LZNT1 Decompress
Decompress LZNT1 (Windows RtlCompressBuffer) blobs from hex or Base64 in your browser — registry hives, hiberfil, malware configs. Free, private, no sign-up.
MAC Address Format Converter
Reformat MAC addresses between colon, hyphen, Cisco dotted-quad, and bare hex — in lower or upper case. Paste one or many; runs in your browser, nothing uploaded.
MAC Address Vendor Lookup
Look up the manufacturer of any MAC address from its OUI prefix with the bundled IEEE registry — colon, hyphen, dot or bare hex. Offline, free, in-browser.
MACD Calculator
Compute the MACD indicator from any price series — MACD line, signal line and histogram, with configurable 12/26/9 EMA periods. Free, private, in-browser.
Magnet Link Parser & Builder
Parse a BitTorrent magnet link into info-hash, display name, trackers, and web seeds — or build one from parts. Runs in your browser, nothing uploaded.
Mail Merge from CSV
Fill a text or markdown template once per CSV row — {{name}} placeholders, comma/semicolon/tab data, custom separators. Batch form letters privately in-browser.
Markdown to Anki Flashcards
Turn Markdown notes into an Anki-importable flashcard deck. Headings, Q/A lines, tables or cloze — with deck, tags, note type and TSV/CSV controls.
Markdown Link Check
Paste Markdown and get an offline report for malformed links, duplicate reference definitions, broken anchors, empty targets, bad mailto links and hygiene warnings.
Markdown Link Flattener
Paste Markdown and replace inline links with visible text, text plus URL, or URL-only output while preserving code examples.
Markdown Linter
Lint Markdown for trailing whitespace, hard tabs, heading spacing, list-marker consistency and more — then auto-fix it. Runs in your browser, nothing uploaded.
Markdown List Marker Normalizer
Normalize Markdown bullets to one marker (-, *, or +), snap nested list indentation to an exact step, and renumber ordered lists.
Markdown Notes Index
Paste a pile of Markdown notes and get a linked index: titles, tags, heading outlines and word counts, as Markdown, JSON or CSV. Free, private, in your browser.
Query a Markdown Document
Paste Markdown and pull out its headings, links, images, code blocks, or tables as plain text, JSON, or clean Markdown. Runs in your browser, nothing uploaded, free.
Markdown to HTML
Render Markdown to sanitized HTML in your browser — tables, code blocks, task lists, and footnotes supported. Free, private, no upload.
Markdown Runbook Extractor
Extract the named code blocks of a Markdown runbook into one runnable script plus an ordered task list. Strips $ prompts. Runs in your browser.
Markdown Section Extractor
Extract one section from a Markdown document by heading — keep or drop subsections, exact or substring match, ATX and setext. Free, in your browser.
Markdown to Plain Text
Strip Markdown formatting to clean plain text: headings, bold, links, code fences, tables, lists, and blockquotes. Free, private, in-browser, no sign-up.
Markdown Table Extractor
Paste a Markdown document and pull every GitHub-flavored table out of it as CSV, JSON or JSON Lines. Pick one table or export them all. Runs in your browser.
Markdown Table Formatter
Format GitHub-flavored Markdown tables online — even column widths, tidy delimiter rows, alignment kept or forced. Free, in your browser, no upload.
Markdown Table to CSV
Convert Markdown or pipe-delimited tables into clean CSV. Strip alignment rows and padding; choose delimiter, quoting, line endings, header, and BOM.
Markdown to Confluence
Convert Markdown to Confluence markup in your browser — storage format (XHTML) or wiki markup, with code macros, panels, tables, and lists. Free, no upload, no sign-up.
Markdown to Word (.docx)
Convert Markdown into a real Microsoft Word .docx document in your browser. Headings, lists, quotes, code blocks and inline formatting become editable Word content.
Convert Markdown ↔ Jira Wiki Markup
Convert Markdown to Jira wiki markup and back locally. Handles headings, lists, tables, code blocks, links, images, quotes, and common panels.
Markdown to LaTeX
Convert Markdown to LaTeX in your browser — headings, lists, tables, code blocks, links, math passthrough; body fragment or full document. Free, no upload.
Markdown to PowerPoint (.pptx)
Turn a Markdown outline into a real PowerPoint .pptx deck — headings become slides, lists become bullets. Light/dark themes, 16:9 or 4:3. In-browser, nothing uploaded.
Markdown to Slides
Convert Markdown to a self-contained HTML slide deck in your browser — split slides with ---, arrow-key and swipe navigation, light or dark theme. Free, private.
Read a Mattermost Bulk Export
Paste a Mattermost bulk export (import.jsonl) and get a readable per-channel transcript with resolved authors, timestamps, threads and a summary. Runs locally.
MBOX Dedup
Paste an mbox archive and remove duplicate messages by Message-ID. Keep first or last, handle ID-less messages, and download the cleaned mbox locally.
MBOX Splitter
Paste an mbox archive and split it into individual .eml messages with suggested filenames. List what is inside, pull out one message, or export JSON — all local.
Generate a Mel Spectrogram PNG
Render a local audio file as a PNG mel spectrogram with ML-style FFT, hop, mel-band, dB, colormap, and image-size controls.
Memory Strings Extractor
Extract ASCII and UTF-16LE strings from a memory or process dump, then group URLs, IPs, emails, domains, file paths and registry keys locally.
Resolve Git merge conflict markers
Paste a file with Git conflict markers and resolve every block by keeping ours, theirs, both sides or the diff3 common ancestor, with per-conflict overrides.
Mermaid from data
Turn structured node and edge rows into Mermaid flowchart, classDiagram or erDiagram source with labels, shapes and relationship styles.
OBJ ↔ STL Mesh Converter
Convert pasted OBJ or ASCII STL meshes to OBJ, ASCII STL, or binary STL data URLs. Supports scaling, Y-up/Z-up axis swaps, and triangulation.
Metadata Privacy Linter
Scan image metadata for privacy leaks before sharing: GPS, serial numbers, owner names, timestamps, software, descriptions and keywords. Browser-local, no upload.
Extract MFCC Features from Audio
Extract MFCC features from audio as CSV, TSV, or JSON. Tune speech defaults, librosa-style settings, deltas, and sample-rate options locally.
MIDI Chord Progression Generator
Convert chord symbols like C G Am F into a downloadable .mid file with voicing, inversion, arpeggio, strum, tempo and instrument controls.
MIDI note extractor
Extract every note from a .mid file as a CSV or TSV table: pitch, start, duration and velocity, in seconds, ticks or beats. Free, runs in your browser.
MIDI tempo changer
Change the tempo of a MIDI file without moving a single note. Set an exact BPM or scale the speed, keep or flatten tempo changes. Runs in your browser.
MIDI to JSON
Convert a Standard MIDI File (.mid/.midi) to JSON — paired notes with pitch names, a raw event stream, or a compact summary. Free, runs in your browser.
MIDI track splitter
Split a multi-track MIDI file into separate single-track .mid files, one per track or per channel. Tempo and time signature are copied into every part.
Missing Value Imputer
Fill missing cells in a CSV with mean, median, most-frequent, a constant, or KNN imputation. Pick columns and missing markers. Runs in your browser, free.
Missing Value Report for CSV / TSV
Paste a CSV or TSV table and get per-column missing-value counts, percentages, and a missingness-pattern grid. Handles custom NA tokens. Runs locally in your browser.
Convert MKV to MP4
Free MKV to MP4 converter that runs in your browser. Lossless stream-copy remux for H.264/HEVC clips, or re-encode VP9/AV1. Nothing is uploaded.
Mock Data Generator
Generate realistic mock JSON from a shorthand schema — your own fields, 30+ types, nested objects, arrays, and a seed to reproduce. Free, in-browser.
Molecular Weight Calculator
Compute molar mass, monoisotopic mass, atom counts, and elemental percent composition from a chemical formula. Supports groups and hydrate dot notation.
MongoDB Query Runner for JSON
Run a MongoDB find filter against a JSON array in your browser. Supports $gt, $in, $and, $elemMatch, dotted paths, projection, sort, skip and limit.
Convert a MongoDB query to SQL
Paste a MongoDB find filter or db.collection.find() shell call and get the equivalent SQL condition, WHERE clause, or full SELECT statement.
Monte Carlo Simulation
Run Monte Carlo simulations in your browser: define input distributions, a formula, and trials, then get percentiles, target probability, and a histogram.
Morse Code Translator
Translate text to International Morse code and decode Morse back to text in your browser — A-Z, 0-9, punctuation, custom separators. Free and private.
Mortgage Calculator
Estimate your monthly mortgage payment — principal, interest, property tax, insurance and HOA — plus total interest, total cost and how extra payments shorten the term.
Convert MOV to MP4
Free MOV to MP4 converter that runs in your browser. Lossless container remux (stream-copy) for H.264/HEVC clips, or re-encode ProRes. Nothing is uploaded.
Moving Average Calculator
Calculate simple, exponential and weighted moving averages (SMA, EMA, WMA) over any number series with your chosen window. Free, private, in-browser.
Convert MP4 to FLV
Convert MP4, MOV, MKV or WebM to FLV in your browser — H.264 or Sorenson Spark, AAC or MP3, with RTMP-friendly bitrate and keyframe controls. Nothing uploaded, free.
Extract M4A Audio from MP4
Extract an MP4's audio track to M4A in your browser. Lossless stream-copy remux — no re-encode, no quality loss, nothing uploaded.
Convert MP4 to MKV
Free MP4 to MKV converter in your browser. Lossless stream-copy remux — keeps video, audio and subtitle tracks, nothing re-encoded or uploaded.
Convert MP4 to MOV
Free MP4 to MOV converter in your browser. Lossless stream-copy remux into a QuickTime container for Final Cut Pro and iMovie — nothing re-encoded or uploaded.
MessagePack to JSON
Paste MessagePack hex or base64 and decode it into pretty-printed JSON. Preserves field order, uint64 values, timestamps, and binary payloads in your browser.
MT940 Statement Parser
Parse a SWIFT MT940 bank statement into JSON or CSV in your browser: balances, dates, debit/credit, amounts, references and narrative. No upload, free.
Multi Encoder
Encode or decode text across Base64, hex, binary, URL-encoding, ROT13, and Morse — one tool, both directions. Runs in your browser, nothing uploaded, free.
Multilingual Stemmer
Stem words with Snowball algorithms in English, German, Spanish, French, Russian, Arabic and more. Browser-local text, stem list, mapping, table or JSON output.
Multiple linear regression calculator
Paste a numeric data matrix and fit an OLS multiple regression: coefficients, p-values, confidence intervals, R², adjusted R² and F-test.
Music File Renamer
Build a safe rename and folder-move plan for music files from pasted tag dumps, templates, and filesystem rules.
Generate a Safe Rename Script
Paste an old,new filename mapping and get a safe bash mv or PowerShell Rename-Item script, correctly ordered and quoted, plus the matching undo script.
NaCl crypto_box encrypt/decrypt
Encrypt or decrypt NaCl crypto_box messages with Curve25519 keys, XSalsa20-Poly1305 authentication, and hex/base64 inputs. Free, local, and browser-based.
NaCl Secretbox encrypt/decrypt
Encrypt or decrypt NaCl secretbox data with a 32-byte shared key and 24-byte nonce. Free, local, and browser-based.
Train a local Naive Bayes text classifier
Train a naive Bayes classifier from labeled examples, then classify text with multinomial, Bernoulli, or complement scoring and token explanations.
Natural Language → Todo.txt
Turn plain-English tasks into todo.txt lines with priority, +project, @context and due dates from phrases like tomorrow or next Friday.
NDJSON / JSON Lines Filter
Filter and reshape NDJSON (JSON Lines) in your browser. Keep rows with a predicate, pick or rename fields, and export as JSONL, a JSON array, or CSV.
NDJSON to matrix
Turn NDJSON / JSON Lines records into one aligned table: unified columns from dotted paths, chosen fill for missing cells, CSV, TSV, matrix or JSON out.
NDJSON Viewer
Paste NDJSON / JSON Lines and read it: pretty, compact, array or table view, search any key or value at any depth, and per-line error reporting.
Net Worth Calculator
Paste your assets and liabilities and calculate net worth with a per-category breakdown, proportional bars, and a debt-to-asset ratio. Runs in your browser.
Network Config Parser
Parse Cisco IOS, Arista EOS, or Juniper Junos configs into nested JSON, flat command paths, or a compact stats report in your browser.
Newsletter HTML Builder
Build responsive, email-client-safe newsletter HTML from simple sections: headings, text, buttons, images, columns. Inline CSS, Outlook-safe, in your browser.
NEXUS to FASTA Converter
Convert NEXUS DATA or CHARACTERS sequence matrices to FASTA locally, with interleaved matrices, comments, matchchar expansion, TAXA labels, gaps, and wrapping.
Nmap Output Parser
Parse nmap XML or greppable output into sortable host, port, service and version tables. Export Markdown, CSV or JSON.
NMEA to CSV
Convert raw NMEA 0183 GPS/GNSS sentences into a timestamped CSV track with latitude, longitude, altitude, speed, course and fix quality.
Sign a Nostr event locally
Build a Nostr event from content, tags and kind, sign it from an nsec or hex secret key, and copy publish-ready JSON. Runs locally in your browser.
Convert Nostr keys and ids
Convert Nostr keys and event ids between raw hex and NIP-19 bech32: npub, nsec, note, nprofile and nevent. Runs locally in your browser.
Export Markdown Notes to HTML
Combine Markdown notes into one standalone HTML page with embedded CSS, sanitized output and a linked table of contents.
NPY Array Decoder
Decode a NumPy .npy file in your browser: read its dtype, shape and byte layout, and export the array values as JSON or CSV. No Python, no NumPy, no upload.
NT / NTLM Hash Generator
Generate the NT (NTLM) hash of a password — MD4 of its UTF-16LE encoding — instantly in your browser. Hex or base64 output. Free, private, nothing uploaded.
Format a Number as Currency
Format a pasted number as currency with symbols or codes, grouping, decimal places, rounding, signs, accounting parentheses and locale-style separators.
Convert Number Words to Digits
Convert numbers written in English words into digits — inside prose, line by line, or as a list. Handles decimals, fractions, ordinals, lakh/crore and long scale.
Numeric Range Check
Flag CSV numeric values outside an expected min/max range, with column selection, delimiter detection, and text or JSON reports.
Numeric Row Deduplicator
Remove duplicate numeric rows from CSV/TSV in your browser. Compare cells by value, key on selected columns, apply rounding tolerance, and keep first or last.
Clean messy number cells into floats
Strip currency symbols, thousands separators, units, percents, and stray whitespace from messy spreadsheet number cells and parse them into clean floats.
OBJ Vertices to CSV
Extract every vertex of a Wavefront OBJ mesh into an x,y,z CSV or plain XYZ point cloud — with unit scaling, Y-up/Z-up conversion, rounding, dedupe and object filters.
Clean up OCR text
Clean OCR text by expanding ligatures, rejoining hyphenated line breaks, reflowing lines, fixing confusables, and normalizing spacing.
One-hot encode a CSV categorical column
One-hot encode a CSV categorical column into binary 0/1 indicator columns. Drop a reference level, cap top categories, and keep or remove the original.
One-Time Pad
Encrypt, decrypt, or generate true one-time pads locally: mod-26 letters, mod-10 digits, or bytewise XOR with hex/Base64 pads.
OpenAPI Stub from JSON
Generate an OpenAPI 3.1 operation stub from sample request and response JSON, with inferred schemas, parameters, examples, and YAML or JSON output.
Generate curl Commands from OpenAPI
Generate ready-to-run curl commands from an OpenAPI or Swagger spec. Build sample path, query, header and body values locally in your browser.
OpenAPI to Fetch Client
Generate a self-contained typed TypeScript fetch client from an OpenAPI or Swagger paths spec, with functions or a class and configurable error style.
OpenAPI to TypeScript Types Generator
Turn an OpenAPI 3.x or Swagger 2.0 schema into TypeScript types in your browser — paste JSON or YAML, get interfaces or type aliases with refs and enums handled.
OPML ⇄ JSON ⇄ CSV Converter
Convert OPML subscription files (podcast/RSS exports) to and from JSON and CSV in any direction — in your browser. Folders round-trip; nothing is uploaded.
Decode otpauth-migration exports
Decode an otpauth-migration export payload into standard otpauth provisioning URIs, offline.
otpauth:// URI generator
Build an otpauth:// provisioning URI (TOTP/HOTP) from an issuer, account, and base32 secret to set up any authenticator app. The secret stays in your browser.
otpauth:// URI parser
Paste an otpauth:// provisioning URI and see its type, issuer, account, base32 secret, algorithm, digits, and period or counter. Runs in your browser.
Outlier detector
Find outliers in a list of numbers using the z-score, modified z-score (MAD) and IQR (Tukey's fences) methods, in your browser. Free, private, no upload.
Outline to JSON
Turn an indented text outline into nested JSON in your browser — spaces or tabs, children-array or nested-object shape, pretty or minified. Free, private.
Outline to Mind Map
Paste an indented text outline and get a clean mind-map SVG in your browser — nothing uploaded. Indentation sets nesting; right or top-down layouts, dark theme.
Convert OwnTracks Exports to GPX
Convert OwnTracks JSON or Recorder .rec exports into GPX 1.1 tracks with timestamps, elevation, segments, and optional OwnTracks extensions.
Page Weight Analyzer
Analyze page weight from pasted HTML — resource counts, render-blocking scripts and styles, inline JS/CSS sizes, and a page-weight budget. Free, in-browser.
Generate Pairwise (All-Pairs) Test Cases
Generate deterministic all-pairs test cases from a parameter model. Covers every value pair with far fewer rows than exhaustive combinations.
Parametric Equalizer
Free parametric equalizer in your browser — set the exact frequency, gain and Q of three bands, then save as MP3, WAV, OGG, FLAC or M4A. Nothing uploaded.
Date / Time Parser
Parse a date or time in almost any format — ISO 8601, RFC 2822, US/European dates — into year, month, day, weekday, ISO week and a canonical ISO 8601 value.
Ethernet Frame Parser
Paste an Ethernet frame in hex and decode destination/source MAC, EtherType or 802.3 length, 802.1Q / Q-in-Q VLAN tags, and payload — free, in your browser.
gRPC Frame Parser
Parse gRPC length-prefixed frames from base64 or hex and decode each protobuf payload into a readable field tree. No .proto needed — free, in your browser.
HTTP Message Parser
Parse a raw HTTP/1.x request or response — decode the method, target, status, version, all headers and the body, in your browser. Free, nothing uploaded.
IPv4 Header Parser
IPv4 header parser: paste hex and decode DSCP/ECN, flags, fragment offset, TTL, protocol, checksum validity, and addresses — free, in your browser.
Query String Parser
Parse a URL query string into key/value pairs and structured JSON — repeated keys, PHP/Rails bracket notation, percent and + decoding. Free, in your browser.
TCP Header Parser
Decode a raw TCP header from hex in your browser: ports, sequence/ack numbers, SYN/ACK/FIN flags, window, checksum and TCP options. Nothing is uploaded.
TLS Record Parser
Decode TLS record bytes from hex in your browser — record header plus full ClientHello/ServerHello: cipher suites, SNI, ALPN, versions. Nothing is uploaded.
UDP Header Parser
Decode a UDP header from hex — source and destination ports with service names, length, payload size, and checksum. Free, private, runs in your browser.
URI / URL Parser
Parse a URI or URL into scheme, user info, host, port, path, percent-decoded query parameters, and fragment — free and private, right in your browser.
WebSocket Frame Parser
Decode a WebSocket frame (RFC 6455) from base64 or hex — FIN, RSV bits, opcode, mask flag, payload length, masking key, unmasked payload — in your browser.
Password Strength Checker
Estimate a password's entropy in bits and crack time, and flag weaknesses — entirely in your browser. Your password is never sent anywhere, free.
Password export converter
Convert a password manager export between Bitwarden JSON/CSV, KeePass CSV, LastPass CSV and Chrome CSV. Keeps TOTP secrets and folders. Runs in your browser.
Password Generator
Generate strong random passwords or passphrases with configurable length, character sets, and word count — entirely in your browser, nothing uploaded, free.
Password Vault Audit
Paste a password list or vault export to find reused passwords, duplicate logins, common passwords, short/weak entries, stale items and insecure HTTP URLs. Runs locally.
Extract file paths from logs and text
Paste build logs, stack traces, git status output, or prose and extract deduplicated POSIX or Windows file paths as a list, CSV, or JSON.
Payment QR Generator
Build validated payment URIs and render scannable SVG QR codes for Bitcoin BIP21, Litecoin, Dogecoin, Ethereum, Lightning invoices or plain text.
PBKDF2 key derivation
Derive a key from a password with PBKDF2-HMAC (SHA-1/256/512). Pick iterations, salt, length and hex/base64 output — all in your browser. Nothing is uploaded.
PCA and t-SNE visualizer
Paste a numeric table, reduce it to 2D with PCA or deterministic t-SNE, and get an SVG scatter plot colored by label, plus CSV/JSON coordinates.
Peak Detector
Paste a 1-D signal and find its peaks and valleys, with prominence, height, distance and width filters. Free, runs in your browser.
Split PEM bundles into labeled blocks
Split concatenated PEM bundles into ordered, labeled blocks with type summaries, DER byte counts, suggested filenames, and optional SHA-256 fingerprints.
PEM ⇄ DER Converter
Convert keys, certificates and CSRs between PEM (base64 text) and DER (binary, shown as hex or base64) in either direction. Runs in your browser, nothing uploaded, free.
PEM Inspector
Decode PEM certificates, CSRs, and public/private keys in your browser. See subject, issuer, validity, SANs, key size, and fingerprints. No upload.
Extract Public Key from a Private Key
Derive the public key from an RSA, EC (P-256/P-384) or Ed25519 private key as a PEM public-key block. Free, in your browser — nothing is uploaded.
PEM → JWK converter
Convert a PEM-encoded RSA or EC key into a JSON Web Key (JWK), in your browser. Nothing is uploaded.
Normalize counts into per-capita rates
Paste label, count and population rows and get population-adjusted rates per capita, per 1,000, per 100,000 or a custom base.
Percent Decimal Converter
Convert percentage strings like 12.5% to decimal fractions like 0.125, or decimals back to percentages, across a pasted column or delimited table.
Percent difference between two numbers
Compare two numbers: absolute difference, symmetric percentage difference, and percent change in both directions. Runs in your browser, nothing uploaded.
Percentage Calculator
Free percentage calculator: what is P% of X, what percent X is of Y, percent increase or decrease, and share of a total. Private, runs in your browser.
Percentile Rank Calculator
Calculate percentile rank for one or more values in a dataset. Choose weak, strict, mean or rank tie handling, plus rounding and summary stats.
Period Predictor
Predict your next period start dates from your last period and cycle length, with ovulation estimates and fertile windows. Free, private, in-browser.
Normalize Persian Text
Normalize Persian/Farsi text: replace Arabic letters, fix ZWNJ half-spaces, convert digits, and correct punctuation spacing in your browser.
Persian Tokenizer
Tokenize Persian text into words and sentences. ZWNJ half-space compounds stay whole, Persian punctuation and digits handled. Free, in your browser.
Split full names into first, middle, last & more
Split a CSV full-name column into title, first, middle, last, and suffix fields. Handles titles, suffixes, particles, and Last, First names.
PGP decrypt
Decrypt a PGP message online with your private key or the password it was encrypted with. Verifies embedded signatures, handles binary payloads, runs in your browser.
PGP key info
Inspect an ASCII-armored PGP public or private key locally: fingerprint, key ID, algorithm, user IDs, dates, and subkeys.
PGP verify
Verify a PGP signature online — detached or clearsigned — against a message and public key; reports validity and signer key ID. Runs in your browser.
Phishing Header Inspector
Paste raw email headers to flag From/Return-Path mismatches, Reply-To detours, failed SPF/DKIM/DMARC, and suspicious Received hops locally.
Phone Number Formatter & Validator
Parse, validate and format any international phone number — E.164, national and international formats, country and line type. Free, in-browser.
Photo Filter Presets
Apply a one-click photo filter — sepia, vintage, warm, cool, noir, grayscale, vivid, invert, or fade — right in your browser. No upload to a server, runs locally, free.
JSON → PHP serialize()
Convert JSON to PHP serialize() format in your browser — byte-accurate strings that PHP's unserialize() can read. Free, private, no sign-up.
PHP unserialize() → JSON
Decode a PHP serialize() string to readable JSON in your browser. Inspect PHP sessions and WordPress wp_options values. Free, private, no sign-up.
PHYLIP to FASTA Converter
Convert PHYLIP alignments to FASTA in your browser. Sequential and interleaved layouts, strict or relaxed taxon names, gap stripping. Nothing is uploaded.
Make a Pie or Donut Chart
Turn labeled values into a clean pie or donut chart as a scalable SVG — in your browser, nothing uploaded. Auto percentages, custom colors, legend, and title.
PII Tokenizer
Replace emails, phones, IPs, cards and SSNs with deterministic, format-preserving tokens. Same value maps to the same token, so data stays linkable. No upload.
Pinterest Pin Image Resizer
Resize and crop any image to a Pinterest pin size right in your browser — 1000×1500 (2:3), square, tall, or story. Smart crop, no upload, free.
PKCS#12 Inspector
Inspect a .p12/.pfx keystore offline: cert bags, key bags, friendly names, local key IDs, PBE and MAC parameters. No password needed, nothing uploaded.
Plist viewer
Parse XML plist or Base64 binary bplist data and render it as readable JSON or a plutil-style tree. Free, private, in-browser.
PLY to OBJ Converter
Convert a Stanford PLY mesh or point cloud to Wavefront OBJ. Reads ascii and binary PLY, keeps vertex colors, normals and UVs, scales and reorients axes.
PNG to JPG Converter
Convert PNG to JPG in your browser: transparency is flattened onto a background color you choose, with adjustable JPEG quality. Free and private — no upload.
Podcast feed parser
Parse a pasted podcast RSS/XML feed into clean JSON with episode titles, dates, durations, and audio enclosure URLs. Free, private, in-browser.
Portfolio Allocation Calculator
Paste holdings and calculate percentage allocation by asset class, holding, sector, or account with chart-ready values and concentration score.
Portfolio P/L Calculator
Calculate profit and loss across long or short positions from pasted entry and current prices, with fees, tax estimates, sorting, and portfolio totals.
Postman / Insomnia Collection Converter
Paste a Postman Collection v2 or Insomnia export and get curl commands, JavaScript fetch() or axios code for every request, with variables filled in. Browser-only.
Postman Collection Extractor
Paste a Postman Collection v2 export and list every request — folder, method, URL, headers, body, auth — as a table, CSV, JSON, Markdown or URLs. Browser-only.
Principal component analysis (PCA) calculator
Paste a numeric data matrix and run PCA: eigenvalues, explained variance, scree plot, loadings, and projected scores.
Prisma Schema from SQL
Convert SQL CREATE TABLE / ALTER TABLE DDL into a Prisma schema — models, fields, @relation from foreign keys, indexes and native types — locally in your browser.
Prisma Schema to SQL
Convert a Prisma schema into SQL CREATE TABLE DDL — columns, primary keys, indexes, enums and foreign keys — for PostgreSQL, MySQL, SQLite or SQL Server, in your browser.
Pronounceable Password Generator
Generate pronounceable, easy-to-type passwords from consonant/vowel phonemes with length, capitalization, digit, and symbol controls.
Lint English Prose for Style Issues
Paste English prose and flag clichés, weasel words, passive voice, redundancies, jargon, long sentences, and repeated words locally in your browser.
Protobuf Wire Decoder
Decode raw protobuf wire bytes (base64 or hex) into a field-number/wire-type tree — no .proto schema needed, nested messages recursed. Free, in your browser.
Python Dict to JSON Converter
Convert a Python dict or list literal to valid JSON in your browser — handles True/False/None, single quotes, tuples, trailing commas and comments.
QIF / OFX to CSV Converter
Convert QIF, OFX and QFX bank exports to clean normalized CSV in your browser — Date, Amount, Payee, Memo, Category and more. Free, private, no upload.
QR Paper Backup
Encode text or pasted file bytes into a printable SVG sheet of numbered QR codes with restore instructions and checksummed chunk metadata.
Query Result Formatter
Turn raw query result rows — a JSON array, CSV, or TSV — into a clean, aligned Markdown or ASCII table for docs and chat.
Query String Codec
Free online query string codec: parse URL query strings into JSON or build encoded query strings from JSON, with arrays and bracket notation.
Rabbit cipher
Encrypt or decrypt text with the Rabbit stream cipher (RFC 4503 / eSTREAM) — 128-bit key, optional 64-bit IV, hex or base64. Free, in-browser, no upload.
RAKE Keyword Extractor
Extract the top keywords and keyphrases from any document using the RAKE algorithm — ranked by relevance, right in your browser. Nothing is uploaded.
Random Bytes Generator
Generate cryptographically secure random bytes and output them as hex, Base64, Base64URL, binary, decimal, a C array or a Python bytes literal.
Random projection dimensionality reducer
Reduce a wide numeric table to fewer dimensions with a Johnson–Lindenstrauss random projection, and see how much pairwise distances moved.
Random Token Generator
Generate cryptographically secure random tokens, API keys, and secrets with a configurable length and character set — entirely in your browser, nothing uploaded, free.
RC2 cipher
Encrypt or decrypt with the RC2 block cipher (RFC 2268) in ECB or CBC mode, configurable effective key bits, hex or Base64 output — in your browser.
RC4 cipher
Encrypt or decrypt text with the RC4 stream cipher — optional drop-N to skip weak keystream bytes, hex or base64 output — free and in your browser.
RC6 cipher
Encrypt or decrypt data with RC6-32/20 in ECB or CBC mode with hex/base64 I/O — in your browser. For interop, learning, and CTFs. Nothing is uploaded.
Readability Extractor
Paste a web page's HTML and extract just the main article — title and body — with navigation, ads, and boilerplate stripped. Free, runs in your browser.
Readability score
Score any text for readability with Flesch Reading Ease, Flesch-Kincaid Grade, Gunning-Fog and SMOG, in your browser. Nothing is uploaded.
Recovery Code Generator
Generate printable one-time account recovery codes with custom length, grouping, alphabet and optional SHA-256 storage digests.
Recurring Task Expander
Expand recurring task rules (rec:1w, rec:+2m, mon,thu, weekdays) into the next dated instances. Paste a todo list, get real due dates. Free and in-browser.
Check a Photo for Red-Eye
Check a flash photo for red-eye before you print or post it. Get the pixel position, radius and confidence of every red pupil, entirely in your browser.
Redact PII
Detect and redact PII (emails, phone numbers, IPs, credit-card and SSN numbers) in text, in your browser. Nothing is uploaded.
Bulk Regex Matcher
Check one regular expression against a pasted list of lines. See match/no-match status, captures, positions, JSON, or CSV output. Runs locally.
Regex Capture Groups to CSV
Scan text with a regex and get CSV: one row per match, named capture groups as columns. Pick the delimiter, quoting, and columns — all in your browser.
Run a regex codemod across many files and preview the diff
Paste several files, run one regex find-and-replace with capture groups, and preview the result as a unified diff before you apply it.
Validate a CSV column with a regex
Validate one CSV column against a regex, with header or index selection, delimiter auto-detect, blank handling, inverted matching, and text or JSON reports.
Regex Extract
Run a regular expression over text and extract every match — case-insensitive, multiline, dot-all, capture groups, dedupe. Free, in your browser.
Regex Literal Escape
Escape special characters so a regex matches text literally. Nine flavors: PCRE, JavaScript, Python, Go/RE2, .NET, Java, Ruby, and Rust.
Regex Search
Search pasted text with a regex or literal pattern and return matching lines with line numbers, context, invert, whole-word, and highlighting.
Regex Tester
Test regular expressions online — see every match with positions plus the value and span of each numbered and named capture group. Free, in-browser, no upload.
Regex to JSON
Parse each line of text with a named-capture regex and turn it into structured JSON — group names become keys. Type coercion, NDJSON output, in your browser.
Registry Hive Parser
Parse offline Windows registry hive bytes from hex or Base64, inspect regf header integrity, browse keys and values, and sweep Run/RunOnce autostart locations locally.
Regression model trainer
Fit linear, ridge, or bounded random-forest regression from a pasted numeric table and report R², RMSE, MAE, coefficients, or feature importance.
Relative to Absolute URLs
Rewrite relative href, src and srcset values in HTML to absolute URLs against a base. Only the URLs change. Free, runs in your browser.
Remove control characters
Strip null bytes and non-printable control characters from text, in your browser. Keep tabs and newlines or remove them too. Nothing is uploaded.
Remove Duplicate Lines
Remove duplicate lines from text in your browser — keep first or last occurrence, ignore case or whitespace, uniq-style consecutive mode. Free, private.
Remove Empty Lines
Delete all blank and whitespace-only lines to compact your text, or collapse runs of blank lines to one. Free and private — runs in your browser, nothing is uploaded.
Remove whitespace
Trim leading/trailing whitespace, collapse extra spaces, or strip all whitespace from text, in your browser. Nothing is uploaded.
Jinja2 Template Renderer
Render a Jinja2 template against JSON or YAML data in your browser — variables, loops, conditionals and filters. Free, private, no upload.
Template Renderer
Render a Handlebars or Mustache template against JSON data in your browser — {{variables}}, nested paths, {{#each}} loops and {{#if}} conditionals. Free, private.
Rent Affordability Calculator
Work out affordable rent from income using the 30% rule or a custom ratio, with debts, gross-vs-net handling, guideline ranges, and money left over.
Rent vs Buy Calculator
Should you rent or buy a home? Run the invest-the-difference net-worth race over your time horizon and get a break-even year and a buy/rent verdict.
Remove accidentally repeated words from text
Paste text and delete accidentally doubled words like "the the". Keeps real English repeats such as "had had", with a marked-up diff and an audit report.
REST File to cURL
Paste a .http, .rest or .ain request file, supply variables or an environment, and get ready-to-run curl commands for bash, cmd or PowerShell. Browser-only.
Resume Builder
Turn structured JSON details — contact, experience, skills — into a clean, ATS-friendly Markdown resume in your browser. Free, private, no sign-up.
Résumé Scaffolder
Turn structured JSON details — contact, experience, education, skills — into a clean, print-ready HTML résumé you can Print to PDF. Free, private, no sign-up.
Resume to JSON
Paste a plain-text resume and get a JSON Resume (v1.0.0) document — or validate an existing resume.json against the schema. Runs in your browser.
Returns risk analyzer
Paste a returns series and compute annualized return, volatility, Sharpe, Sortino, Calmar and max drawdown, in your browser. Free, private, no upload.
RNCryptor v3 encrypt
Encrypt text or bytes into the password-based RNCryptor v3 container format, or verify and decrypt one, with base64/hex input and output.
Round Decimals in a CSV
Round the numeric columns of a CSV to N decimal places in your browser. Pick a rounding mode (half-up, banker's, ceil, floor, truncate). Free, no upload.
Round to Nearest Multiple
Round CSV numbers to the nearest multiple of any step — 0.25, 0.05, 5, 100, 1000. Pick nearest, up, down, or banker's ties. Browser-only, no upload.
RSA Decrypt
Decrypt RSA ciphertext with a PEM private key using OAEP or PKCS#1 v1.5 padding. Supports base64/hex input and UTF-8/hex/base64 output.
RSA encrypt
Encrypt a short message to an RSA public key (OAEP or PKCS#1 v1.5, SHA-256/384/512) and get base64 ciphertext, in your browser. Nothing is uploaded.
RSA sign
Sign a message with an RSA private key (PKCS#1 v1.5 or PSS, SHA-256/384/512) and get a base64 signature, in your browser. Nothing is uploaded.
RSA verify
Verify an RSA signature (PKCS#1 v1.5 or PSS, SHA-256/384/512) over a message against an RSA public key, in your browser. Nothing is uploaded.
RSI calculator
Calculate Wilder's Relative Strength Index (RSI) from pasted closing prices with configurable period and overbought/oversold thresholds. Runs locally in your browser.
RTF to Markdown Converter
Convert raw RTF source to clean Markdown with headings, lists, links, tables, bold, italic, underline, and Unicode escapes preserved in-browser.
RTF to Text
Convert RTF (Rich Text Format) markup to clean plain text in your browser. Strips control words, tables, and formatting; decodes Unicode and hex escapes. Free, private.
Rule-based text extractor
Turn logs, invoices or scraped text into structured data with named regex rules. Grok-style %{PATTERN:field} shortcuts, JSON/CSV output, per-rule report.
Map Rust source into a module tree
Paste Rust source and map its modules, structs, enums, traits, impl blocks, functions and visibility as a tree, Mermaid graph, JSON, or crate::path list.
SafeLink Decoder
Decode Outlook SafeLinks, Proofpoint URLDefense (v2/v3), Google redirects and ?url= wrappers to reveal the real destination. In-browser, no fetch, free.
Salary Converter
Convert pay between hourly, daily, weekly, biweekly, monthly and annual figures. Set your hours per week and weeks per year — all six rates at once, free and in-browser.
Salsa20 cipher
Encrypt and decrypt with the Salsa20 stream cipher in your browser — 16/32-byte key, 8-byte nonce, hex or base64 output. Free, private, nothing uploaded.
Convert SAM Alignment Records to CSV
Convert SAM sequence-alignment records into CSV or TSV with named columns, decoded FLAG bits, optional tag columns, filters, and computed spans.
SBOM Diff
Diff two package-lock.json, Cargo.lock, requirements.txt, or CycloneDX/SPDX SBOMs and see added, removed, and version-bumped dependencies. Runs locally in your browser.
SBOM Generator
Generate CycloneDX or SPDX SBOMs from package-lock.json, Cargo.lock, or requirements.txt. Runs locally in your browser.
Schema Inferrer
Infer JSON Schema and SQL CREATE TABLE from CSV or JSON samples. Detect column types, nullability, and formats locally in your browser.
scrypt key derivation
Derive a key from a password with the scrypt memory-hard KDF (RFC 7914). Set N, r, p, salt and hex/base64 output — free and fully in-browser.
scrypt encrypted file tool
Encrypt, decrypt and inspect files in the scrypt encrypted data format the scrypt CLI reads, with tunable logN, r and p cost parameters.
Make a Video Loop Seamlessly
Blend a video's ending back into its beginning for a smooth, endlessly repeatable MP4. Adjust the crossfade and quality locally in your browser.
Build a Search Index
Build an offline full-text search index JSON from documents. Pick fields, store result data, set boosts, and run privately in your browser.
Seconds to HH:MM:SS
Convert seconds into HH:MM:SS, D:HH:MM:SS, ISO-8601, or human-readable duration text with optional fractional seconds. Runs locally in your browser.
secp256k1 Public Key Derivation
Derive the secp256k1 public key from a private key: compressed (02/03) and uncompressed (04) SEC1 points, plus X and Y coordinates. Hex or WIF input, all in your browser.
Secret scanner
Paste code or config and flag hardcoded secrets — AWS, GitHub, Stripe, Google and other API keys, plus private-key headers. Runs in your browser, nothing uploaded.
Sentence Length Stats
Analyze sentence length in prose: sentence count, average and max words, variety score, long-sentence rate and a length distribution. Runs locally.
Sentence Splitter
Split text into one sentence per line. Abbreviation-, decimal- and quote-aware boundaries, numbered or JSON output, custom abbreviations. Free, in your browser.
Sentence Tokenizer
Tokenize text into sentences and word, number and punctuation tokens with character offsets. JSON, TSV, one-token-per-line output. Free, in your browser.
SEO Audit
Paste a page's HTML and get a scored on-page SEO audit — title, meta description, headings, image alt text, canonical, and Open Graph tags. Free, private, no upload.
JSON array set diff
Compare two JSON arrays as sets: union, intersection, difference and symmetric difference, matched on whole values or on an id field, with counts.
SHA-1 Hash Generator
Generate a SHA-1 hash of any text in your browser — hex or base64 output, uppercase option, hex/base64 input decoding. Free, private, nothing uploaded.
SHA-256 Hash Generator
Generate a SHA-256 (SHA-2) hash of any text instantly in your browser — hex or base64 output, uppercase option. Free, private, nothing is uploaded.
SHA-3 Hash Generator
Compute the FIPS-202 SHA-3 hash (SHA3-256/384/512) of any text in your browser — the NIST standard, not Keccak. Hex or base64 output. Free, private, no sign-up.
Shamir Secret Recover
Paste Shamir shares to recover a secret locally, with GF(256) format detection, threshold checks and redundant-share verification.
Lint Bash and sh Scripts
Paste a bash, sh, dash or zsh script and catch common shell pitfalls: unquoted variables, missing strict mode, useless cat, risky rm -rf and subshell scope traps.
Shellbags Parser
Parse Windows shellbags from a registry hive pasted as hex or Base64: walk BagMRU, decode shell items and rebuild the folder paths a user browsed, deleted ones included.
Sigma rule matcher
Run Sigma detection rules against parsed Windows event JSON, filter by severity/status, and return report, table or JSON detections.
Simplenote Export to Markdown
Convert a Simplenote JSON export into clean Markdown files with titles, YAML frontmatter or #hashtags, and dates. Free, private, in your browser — no upload.
Sitemap URL Extractor
Paste an XML sitemap or sitemap index and pull out every URL (and lastmod date) as a clean list — in your browser. Nothing is uploaded.
Slugify — URL Slug Generator
Turn any title into a clean URL-safe slug — accents transliterated to ASCII, lowercased, punctuation collapsed to hyphens. Free slug generator, in-browser.
SM2 public key from private key
Derive an SM2 public key from a private key (GM/T 0003, curve sm2p256v1) — hex scalar or PKCS#8 PEM in, SEC1 hex and SPKI PEM out. In-browser, no upload.
SM4 cipher
Encrypt or decrypt data with the SM4 block cipher (GB/T 32907) in ECB or CBC mode, with hex/base64 I/O — in your browser. 128-bit key. Nothing is uploaded.
Smart Quotes Cleaner
Replace smart (curly) quotes, em and en dashes, ellipses, and other typographic characters with plain ASCII in your browser. Free, private, no sign-up.
Smart Quotes Converter
Free online smart quotes converter: turn straight ASCII quotes into curly typographic quotes (and back), with correct opening/closing detection. Runs in your browser.
Social Image Resizer
Resize and crop one image to Instagram, Facebook, X, LinkedIn, YouTube, Pinterest, or TikTok preset sizes in your browser.
SOPS-style config encryption
Encrypt or decrypt YAML, JSON and .env values with a passphrase. Keys stay readable, the file stays valid, and diffs still show what changed.
JSON Array Sorter
Sort a JSON array of objects by one or more fields, ascending or descending. Supports nested dot-paths, per-key direction, missing-value placement, and minify.
Sort Lines
Sort lines of text alphabetically, numerically, naturally or by length, remove duplicates and blank lines — free and private in your browser.
Sorted Order Checker
Check whether a list of numbers is sorted ascending or descending and see exactly where the order first breaks. Free, runs in your browser.
Spaced repetition scheduler
Paste a flashcard review log and get every card's next review date, interval, ease or stability, and leech status with the SM-2 or FSRS algorithm.
Spectral EQ Match
Paste your track's band levels plus a reference or target curve to derive corrective EQ gains, a ready-to-paste ffmpeg filter chain and the loudness offset in dB.
Speech audio quality checker
Paste a short WAV clip as base64 or hex and check ASR readiness: sample rate, channels, SNR estimate, clipping, level, and verdict.
Spell Checker
Check English spelling, get ranked suggestions, and copy a corrected version. Private, free, and runs in your browser.
Spending Categorizer
Paste a bank or credit-card CSV export to auto-categorize every transaction by merchant keywords and summarize spending by category. Runs in your browser.
SPHERE (.sph) to WAV Converter
Convert a NIST SPHERE (.sph) speech-corpus file to a standard WAV in your browser. Parses the ASCII header, fixes big-endian byte order, expands mu-law and A-law.
Smooth a noisy numeric series with a cubic spline
Fit a cubic smoothing spline to noisy numeric data. Choose automatic GCV/CV smoothing, p, lambda, or target degrees of freedom and return JSON, CSV, or SVG.
Split Text by Delimiter
Split text on any delimiter into one item per line — comma, tab, custom, whitespace, or characters, with trim and drop-blanks options. Free, in-browser.
SQL Danger Checker
Paste SQL and flag destructive statements before you run them — DROP, TRUNCATE, and UPDATE/DELETE with no WHERE. Comment- and string-aware, in-browser.
SQL Dialect Converter
Convert SQL between PostgreSQL, MySQL and SQLite in your browser — rewrites identifier quoting, auto-increment columns and CREATE TABLE data types. Free, no upload.
SQL Dump → CSV
Paste a SQL dump and pull the rows out of its INSERT statements into CSV — one CSV per table, with delimiter, header, NULL and quoting options. Free, private, no upload.
SQL Formatter
Format, beautify and standardize SQL queries in your browser. Clauses on their own lines, configurable indentation, keyword casing. Nothing is uploaded.
SQL injection scanner
Paste code and flag SQL built by string concatenation, f-strings, or format calls instead of bound parameters. Runs in your browser, nothing uploaded.
SQL Linter
Paste SQL to flag syntax issues plus SELECT *, comma joins, bare JOINs, and missing subquery aliases. Local, read-only linting.
SQL Playground
Run SQL in your browser against a fresh in-memory database — CREATE TABLE, INSERT, SELECT, JOIN — with table, CSV, or JSON output. Free and private.
SQL Schema Extractor
Parse CREATE TABLE and ALTER TABLE statements from a SQL dump into a clean table, column, and constraint model as JSON or Markdown — locally in your browser.
SRT Subtitle Shifter
Shift SRT subtitle timestamps forward or backward to resync subtitles that run early or late — seconds or milliseconds. Free, private, runs in your browser.
SRT to Plain Text
Strip cue numbers and timestamps from SRT or WebVTT subtitles and return clean transcript text, with options for tags, sound effects, speaker labels and layout.
SRT to VTT Subtitle Converter
Convert SRT to VTT and VTT to SRT free in your browser — format auto-detected, timestamps rewritten, WEBVTT header handled. No upload, no sign-up.
SSH Config Formatter
Pretty-print ~/.ssh/config with canonical keywords and consistent indent, then flag duplicate hosts, shadowed blocks, unknown keywords and bad values.
Get the SSH Public Key from a Private Key
Derive the OpenSSH public key (id_*.pub line) from an RSA, ECDSA (P-256/P-384) or Ed25519 private key. Runs in your browser, nothing uploaded, free.
SSH Public Key Parser
Paste an OpenSSH public key, authorized_keys or known_hosts line and read its algorithm, bit size, comment and SHA256/MD5 fingerprints — free, in your browser.
Analyze a Stack Trace and Find the Root Cause
Paste a Java, Python, JavaScript, Go, Ruby, C#, Rust, or PHP stack trace to get the root cause, the first frame of your own code, and every frame parsed.
Stepwise feature selection for regression
Run forward, backward, or bidirectional stepwise OLS regression on a numeric table to choose predictors by AIC, BIC, AICc, or p-value thresholds.
Turn a Still Image into a Video Clip
Turn a still image into a fixed-length MP4, WebM or MOV clip in your browser. Pick the duration, size, fit, frame rate and quality — nothing is uploaded.
STL format converter
Convert an STL between binary and ASCII either way, in your browser. Paste binary STL bytes as base64 or hex for readable text, or ASCII STL for a binary download.
STL inspector
Inspect an ASCII or binary STL in your browser: triangles, vertices, bounding box, surface area, volume, watertight and manifold status, weight estimate.
STL Repair & Watertight Checker
Paste an STL or OBJ mesh to weld vertices, drop degenerate and duplicate triangles, fix flipped normals, fill holes and check watertightness.
STL Vertices to CSV
Extract triangle vertex coordinates from ASCII or binary STL into CSV or plain XYZ text — with triangle rows, normals, axis conversion, scale, rounding and dedupe.
Stop word remover
Remove stop words from text in 8 languages, or use your own list. Whole-word matching, a keep list, and a removed-words report. Runs in your browser, free.
Stream Editor
Apply safe sed-style scripts to pasted text: substitute, delete, print, insert, append, change, branch, and address by line or regex.
String Escaper
Escape (or unescape) any string for JSON, JavaScript, HTML, URL, shell, SQL, or regex. Spec-aware escaping that runs in your browser; nothing is uploaded.
String Literal Extractor
Extract every string literal from pasted source code, skipping comments, with quote, length, and dedupe filters and list/JSON/CSV output.
String Obfuscator
Mask secrets and PII or transform text with ROT13, leetspeak, and Unicode homoglyphs in your browser — keep first/last chars visible. Free, private.
Strip ANSI Codes
Remove ANSI escape and color codes from terminal output and CI logs instantly in your browser. Strip everything or only colors. Free, private, no sign-up.
Remove console.log statements
Strip console.log, console.debug and other console.* calls from JavaScript or TypeScript. Strings, comments and regex stay untouched. Free, in-browser.
IPv4 Header Stripper
Strip the IPv4 header from a raw hex packet — honoring IHL options and Total Length padding — to get the TCP/UDP/ICMP payload as hex, free in your browser.
UDP Header Stripper
Strip the 8-byte UDP header from a hex datagram to get the payload, plus source/destination ports, length and checksum — free, in your browser.
Structured Data Validator
Validate schema.org structured data from pasted HTML — extract JSON-LD, microdata and RDFa and flag markup errors, locally in your browser.
Subscription Finder
Paste bank or card transactions to find recurring charges, forgotten subscriptions, next charge dates, and projected yearly cost. Free and private.
Subscription Cost Tracker
Add up every recurring subscription, normalize each billing cycle to a monthly and annual figure, and see the biggest spend to cancel. Private, in-browser.
Subtitle Merger
Merge SRT or VTT subtitle files into one — combine split parts or overlay a second language track, with optional per-file time-shift. Free, in your browser.
Super timeline builder
Merge parsed forensic artifact CSVs into one sorted UTC timeline with expansion, dedupe, filters, and CSV/l2tcsv/TLN exports.
Survey Tabulator
Tabulate survey CSV responses into frequency tables and two-way cross-tabs with counts, percentages, and a chi-square test. Free, private, runs in your browser.
SVG Optimizer
Minify and clean SVG in your browser — collapse whitespace, strip comments, the XML prolog and Inkscape/Sodipodi metadata. Path data is untouched. Nothing uploaded.
SVG Recolor
Recolor SVG online free — swap colors with from→to pairs or tint the whole icon monochrome; matches #fff, rgb() and named colors right in your browser.
SVG Security Linter
Paste an SVG and check for scripts, on* handlers, javascript: URLs, foreignObject, external refs and XXE entities. Ranked with line numbers.
SVG Sprite Sheet Builder
Combine multiple SVG icons into one symbol sprite sheet referenced with <use href> — auto, id, or title naming and automatic viewBox. Free, in your browser.
SVG to Data URI
Convert SVG markup to an inline data: URI — URL-encoded or Base64 — with ready-to-paste CSS, mask, img and JSX snippets. Free, runs in your browser.
Swagger 2.0 to OpenAPI 3.0 Converter
Convert Swagger 2.0 specs to OpenAPI 3.0 in your browser — JSON or YAML in, JSON or YAML out, with servers, components, requestBody, and $refs rewritten.
Syntax Highlighter
Syntax-highlight a code snippet to self-contained inline-styled HTML (or ANSI terminal colors) for 100+ languages and many themes, in your browser. Nothing is uploaded.
Syslog Triage
Paste syslog or auth.log text to classify sudo, SSH auth, and cron events, filter failures, and rank failed logins by source IP.
Table heatmap
Shade a CSV/table's numeric cells with a spreadsheet-style color scale and get a styled HTML table. Free, private, no upload.
Table to SVG Image
Render CSV or JSON tables as a clean standalone SVG with headers, zebra rows, themes, accent colors, titles, and alignment controls.
Tabs to Spaces
Convert tabs to spaces or spaces back to tabs online, respecting tab stops. Pick tab width, direction, and leading-only scope. Private in-browser tool.
Tail — Last N Lines
Get the last N lines of any text in your browser, like tail -n — skip footer rows and add original line numbers. Free, private, no sign-up.
Tar Archive Lister
Paste a tar or tar.gz archive as base64 or hex and list every member — path, size, permission mode, owner, group, type and mtime — without unpacking a single file.
Target-encode a CSV categorical column
Replace a CSV categorical column with the per-category mean of a numeric target. Supports smoothing, leave-one-out, replace or append output, and unknown handling.
Task Format Converter
Convert task lists between todo.txt, Markdown checklists, JSON, and CSV while preserving priorities, tags, and dates.
Markdown Task List Summarizer
Summarize a Markdown task list — count done and pending checkboxes, get a completion percentage, or filter tasks — free and private in your browser.
Tasks to iCal
Paste a todo.txt list and get an .ics file of to-do or VEVENT entries to import into Apple Reminders, Google Calendar or Outlook. Runs in your browser.
TCX to GPX Converter
Convert Garmin TCX workout files into GPX 1.1 in your browser. Preserves trackpoints, elevation, timestamps, and heart rate/cadence. Free, private, no upload.
TDEE Calculator
Estimate your BMR and total daily energy expenditure from age, sex, weight, height and activity, with calorie goals, BMI and all activity levels.
Read a Telegram result.json Export
Paste a Telegram Desktop result.json export and get a clean transcript, per-sender message and word stats, top words and emoji. Runs locally.
Tempo Map Extractor
Turn a list of beat times into a tempo map: BPM versus time, with smoothing, drift statistics and CSV, JSON, label-track or MIDI tempo exports.
Colorize Text with Regex Rules
Highlight log or command output with user-defined regex color rules, then export ANSI terminal escapes or self-contained HTML.
Text Corpus Cleaner
Clean a line-oriented text corpus: normalize Unicode, trim/collapse whitespace, drop duplicate, short, or junk lines, and filter by language. Runs in your browser, free.
Text Diff
Compare two text blocks and highlight added, removed, and changed lines.
Text encrypt
Encrypt or decrypt text with a passphrase using AES-256-GCM, in your browser. Get a copy-pasteable token. Nothing is uploaded.
Inspect text file encoding and line endings
Check encoding hints, BOM bytes, line-ending style, line counts, longest lines, whitespace, indentation and control characters in pasted text.
Normalize Text
Normalize text in one pass: Unicode form (NFC/NFD/NFKC/NFKD), case fold, strip accents, collapse whitespace, straighten punctuation. Free, private, in your browser.
Text Pipeline Playground
Pipe pasted text through a chain of transforms — grep, reject, regex replace, sort, unique, head/tail, split, join — with a tiny safe DSL. Free, private, in your browser.
Regex Text Splitter
Split text on a regular expression instead of a fixed character: whitespace runs, mixed delimiters, blank lines. Add a field pattern for columns. Runs in your browser.
Text statistics
Count words, characters, sentences, paragraphs and lines, and estimate reading time, in your browser. Nothing is uploaded.
Text to JSON
Paste INI, key=value / .env, logfmt, CSV, or /etc/passwd-style text and get clean JSON. Auto-detects the format, infers types, and runs entirely in your browser.
Text to Reminders
Turn free-form notes into an importable .ics reminders file with due dates, priorities and optional alarms — private, deterministic and in-browser.
Text to Table
Render delimited text (CSV, TSV, or custom-separated data) as an aligned ASCII or Markdown table.
Text to Unicode
List each character's Unicode code point (U+XXXX), name, \u escape sequence and UTF-8 bytes for any text.
Text Wrap
Hard-wrap text to a fixed column width in your browser — keep indentation and blank lines, optionally break long words. Free, private, no sign-up.
TextRank summarizer
Summarize text by extracting its most important sentences with TextRank, in your browser. No AI model, nothing uploaded.
Time Series Forecaster
Forecast a time series with exponential smoothing, Holt trend, damped trend, or Holt-Winters seasonality, including prediction intervals and accuracy metrics.
Time series generator
Generate deterministic synthetic time-series CSV, TSV, JSON or NDJSON with configurable trend, seasonality, noise, missing values and outliers.
Time-Series Resample
Resample timestamped CSVs to hourly, daily, weekly, monthly or yearly buckets with mean, sum, count, median, std or OHLC. Runs in your browser.
Time to Decimal Hours Converter
Convert HH:MM to decimal hours (1:30 → 1.5) and back for timesheets, payroll and billing — plus total minutes and seconds. Free, private, in-browser.
Timesheet Calculator
Paste a work log of start–stop times tagged by project and get total hours plus billable amounts with rates, rounding and overnight shifts.
Turn Tracked Hours Into an Invoice
Turn tracked hours and an hourly rate into a client-ready invoice with line items, totals, tax, discount and Net terms. Markdown, plain text, CSV or JSON.
Timezone Converter & Meeting Planner
Convert a date and time across multiple timezones with correct DST handling and a 24-hour meeting planner grid. Full IANA database — free, private, in-browser.
Table of Contents Generator
Generate a linked table of contents from Markdown or HTML headings — pick levels, bullets or numbers, Markdown or HTML output — free in your browser.
To-do Organizer
Turn a brain-dump into a prioritized Markdown checklist — tasks grouped High/Medium/Low by urgency keywords, with due-date hints. Free, in-browser.
Toggle Line Comments
Comment or uncomment pasted code with the right marker for its language — //, #, --, ;, %, REM, plus /* */ and <!-- -->. Runs in your browser.
LLM Token Counter & Cost Estimator
Paste text to count LLM tokens with real tiktoken BPE, then estimate the prompt cost and context-window usage for GPT, Claude, and Gemini. Free, private, in-browser.
Format TOML without losing comments
Format TOML in your browser with validation, key sorting, indentation, array layout controls and comment preservation.
TOML to CSV Converter
Turn a TOML array-of-tables into spreadsheet-ready CSV: one row per entry, a unioned header, and dot-notation columns for nested tables.
Topic Modeler
Discover latent topics across pasted documents with deterministic browser-local LDA, including topic word lists, document mixtures, JSON, and CSV output.
TopoJSON to GeoJSON Converter
Convert TopoJSON to GeoJSON in your browser. Decodes shared arcs, delta encoding and the quantization transform into standard RFC 7946 features.
TOTP generator
Generate time-based one-time (2FA) codes from a TOTP secret, in your browser. The secret never leaves your device.
TOTP Secret Setup Generator
Generate a fresh base32 TOTP secret and otpauth enrollment URI for authenticator apps — local, random, and copy-ready.
Train/Test Split
Split a CSV into train, test and validation sets. Stratify on a label, keep groups together, or split sequentially for time series — with a reproducible seed.
Transcript Cleaner
Paste a raw transcript or captions and clean it into readable prose: strip timestamps, remove filler words, merge speaker turns, and fix punctuation locally.
Trim an Audio File
Trim any audio file in your browser — keep or remove a start–end range, add edge fades, save as MP3, WAV, FLAC or M4A. Runs locally, nothing is uploaded.
Truncate Text
Truncate text to a character or word limit with word-safe cutting and a custom ellipsis. Free, private, runs in your browser, no sign-up.
Time Series Decomposition
Paste a time series and split it into trend, seasonal and residual components with STL or classical decomposition. SVG plot plus CSV/JSON components.
Tweet Thread Splitter
Split long text into a numbered tweet thread that never breaks mid-word — custom character limit, (i/N) counters, sentence-aware breaks. Free, in your browser.
Read Your Twitter/X Archive
Paste tweets.js from your Twitter/X data export and get a readable transcript, posting stats, top hashtags and top tweets. Runs entirely in your browser.
TypeScript to JSON Schema
Paste a TypeScript interface, type alias or enum and get JSON Schema — optional props, literal unions, $refs, JSDoc. Draft 2020-12 or Draft-07, in-browser.
TypeScript Transpiler
Paste TypeScript and convert it to best-effort JavaScript locally by stripping annotations, interfaces, assertions, and simple enums.
Unicode to Text
Decode Unicode escape sequences back into readable text. Auto-detects \uXXXX, \u{X}, \xXX, \U00XXXXXX, U+XXXX and HTML &#nn; / &#xnn; in one pass.
Reverse a Unified Diff
Paste a unified or git diff and get the reverse patch that undoes it, including swapped hunks, paths, index lines, renames, modes, and summaries.
Unit Converter
Convert between units of length, mass, temperature, volume, area, speed, data size, and time — instantly in your browser. Names and symbols accepted. Nothing is uploaded.
Unix timestamp converter
Convert Unix timestamps (seconds, milliseconds, microseconds, nanoseconds) to UTC dates, or parse human-readable dates back to epoch timestamps. Free, private, no upload.
Unwrap text
Remove hard line breaks inside paragraphs to rejoin wrapped text into continuous lines, in your browser. Nothing is uploaded.
URL Cleaner
Remove tracking parameters (utm_*, fbclid, gclid and more) from any URL for a clean, shareable link — batch mode, custom params. Free, private, in-browser.
URL Encoder / Decoder
Percent-encode or decode text and URLs in your browser — component, whole-URL, or form mode, batch per-line, and recursive decode. Free, private, no sign-up.
URL Normalizer
Normalize URLs in bulk: lowercase hosts, remove default ports, resolve dot-segments, canonicalize percent-encoding, sort query params, and optionally strip tracking.
URL Query Normalizer
Canonicalize URL query strings: sort parameters, collapse duplicates, fix percent-encoding, and optionally strip utm_* tracking. Bulk, free, in your browser.
URL Safety Inspector
Paste a URL to rate phishing risk from structural heuristics: IP hosts, @ tricks, deep subdomains, punycode and lookalike TLDs. Runs locally.
URL Stripper
Free online URL stripper: remove http/https/ftp URLs and www. links from text, optionally strip emails, and tidy leftover spacing in your browser.
Trailing Slash URL Normalizer
Paste a list of URLs and make every trailing slash consistent — add one, or strip them all. File paths like /sitemap.xml are left alone. Runs in your browser.
USN Journal Parser
Parse an NTFS $UsnJrnl:$J change journal from hex or Base64 and list file create, rename, write and delete events with UTC timestamps, locally.
UTM Link Builder
Free UTM link builder — add utm_source, utm_medium and utm_campaign tags plus GA4 fields to any URL, correctly encoded, right in your browser.
Value Counts for a CSV Column
Count distinct values in a chosen CSV column with counts and percentages. Pick a header or column index, sort by count or value, and include blanks if needed.
vCard Duplicate Remover
Find and merge duplicate contacts in a vCard (.vcf) file. Match on name, email, or phone; merge into one card or drop extra copies. Runs in your browser.
Normalize vCard Contacts
Normalize vCard address books locally: lowercase emails, format valid phone numbers, tidy names, and preserve custom fields.
vCard QR Code Generator
Turn contact details into a vCard (.vcf) and a scannable QR code. Scanning it saves the contact on iOS and Android. Static, free, and generated in your browser.
vCard to JSON
Convert vCard (.vcf) contact cards to a clean JSON array. Parses vCard 2.1/3.0/4.0, splits names and addresses, keeps phone/email types. Runs in your browser.
vCard Validator
Paste a vCard to validate it against the 2.1, 3.0 and 4.0 specs: missing FN/N/VERSION, malformed phone numbers and emails, bad dates and structure. Runs in your browser.
Checksum Verifier
Verify text or data against an expected checksum — auto-detects MD5, SHA-1, SHA-256, SHA-3, BLAKE2 or BLAKE3 from digest length. Free, private, in-browser.
Add a Silent Audio Track to a Video
Give an audio-less video a silent audio track so uploaders and editors that require an audio stream accept it. The picture is copied untouched, in your browser.
Pad a Video to an Aspect Ratio
Letterbox or pillarbox a video to 9:16, 1:1, 16:9 or any preset ratio with colored bars or a blurred background — free, in your browser, nothing is uploaded.
Fix Video Aspect Ratio
Repair a video that plays stretched or squashed by retagging its display aspect ratio locally with ffmpeg stream copy — no upload, no re-encode, no quality loss.
Set a Video's Audio Bitrate
Re-encode just a video's audio at your chosen bitrate to shrink an oversized soundtrack while the picture is stream-copied untouched. Runs in-browser; nothing uploaded.
Compress a video's audio dynamics
Even out a video's quiet and loud passages in your browser with ffmpeg dynamic-range compression. The picture is copied untouched.
Remove Background Noise from a Video
Clean up hiss, hum and background noise in a video's audio right in your browser — pick a strength and denoiser. The picture is untouched. Nothing is uploaded, free.
Fade Video Audio In or Out
Add fade-in and fade-out ramps to a video's audio while copying the picture untouched. Free, private, and runs in your browser.
Change a Video's Audio Volume
Make a video louder or quieter right in your browser — by decibels or a factor, with a clipping-safe limiter. The picture is untouched. Nothing is uploaded, free.
Remove Mains Hum from a Video
Kill 50/60 Hz electrical hum and harmonics in a video's audio with tuned notch filters. The picture is untouched and nothing is uploaded.
Video audio RMS timeline
Extract windowed RMS and peak audio levels from a video's audio track into a CSV or JSON time series. Set the window, hop, and dBFS/linear unit.
Fix Video Audio Sync
Shift a video's audio earlier or later to fix lip-sync in your browser. Positive delays, negative advances; the picture is untouched. Nothing is uploaded.
Keep One Audio Track in a Video
Pick which audio track to keep in a multi-language video and drop the rest — lossless, no re-encode. Runs in your browser, nothing is uploaded, free.
Remove Black Bars from a Video
Auto-detect and crop letterbox or pillarbox black bars from a video. Two-pass ffmpeg cropdetect runs in your browser — nothing is uploaded.
Bake Video Rotation Metadata
Bake a video's rotation metadata into upright pixels and clear the rotate flag so sideways phone clips play correctly everywhere.
Blur or Pixelate a Region in a Video
Blur or pixelate a fixed rectangle — a license plate, name tag or logo — on every frame of a video, right in your browser. Nothing is uploaded, runs locally, free.
Burn Subtitles Into a Video
Hard-burn an SRT or WebVTT subtitle track into your video so captions show even when muted — pick position, font size, color and a background bar. Free, in your browser.
Compress a Video
Shrink a video's file size right in your browser — pick a quality (CRF). Re-encodes locally with ffmpeg to H.264/AAC, nothing is uploaded, free.
Crop a Video
Crop a video to any rectangle in your browser — set width, height, and an optional x/y offset (centered by default). Re-encodes locally with ffmpeg, free.
Cut a Video into Segments
Cut a video to multiple time windows, keep or remove those clips, and export one joined MP4. Runs locally in your browser.
Remove Duplicate Frames from a Video
Drop repeated frames from a screen recording or slideshow export in your browser — shrink the file, clean the timing, optionally close the pauses. Nothing uploaded.
Deinterlace a Video
Remove interlacing combing from camcorder, DV, DVD or broadcast footage in your browser — pick bwdif or yadif and keep or double the frame rate.
Denoise a Video
Remove noise, grain and sensor speckle from a video in your browser — choose a strength and denoiser. Local ffmpeg cleanup, nothing uploaded.
Fix Video Duration
Repair a video whose duration shows as Infinity, 0:00, or the wrong length by remuxing it locally with ffmpeg stream copy — no upload, no re-encode, no quality loss.
Check a Video's Duration Against a Target
Check a video's exact duration against a target length and get a PASS or FAIL with the delta. Enforce a 30s ad, a 59s Reel or a minimum watch time in your browser.
Adjust Video Brightness, Contrast & Color
Free online video color adjuster — tweak brightness, contrast, saturation, and gamma with live sliders. Re-encodes locally with ffmpeg in your browser, nothing uploaded.
Extract a Video's Audio Track (Lossless)
Demux a video's audio track in your browser with no re-encode — lossless stream-copy into MKA, M4A or OGG. Pick the track, keep the original codec, nothing uploaded.
Fade a Video In and Out
Add a fade-in and fade-out to a video — picture fading from and to black, sound ramping out of and into silence. Free, private, runs in your browser.
Extract a Video's First & Last Frame
Grab a video's first and last frame and stitch them into one before/after image — side by side or stacked. Free, in your browser with ffmpeg, nothing uploaded.
Change a Video's Frame Rate
Change a video's frame rate right in your browser — set any fps (60→30, 24, 25). Frames are dropped or duplicated with ffmpeg locally, nothing is uploaded, free.
Fragment MP4 for Streaming
Convert a progressive MP4 into a single-file fragmented MP4 for MSE, DASH byte ranges or CMAF-style playback. Stream-copy by default; optional H.264/AAC re-encode.
Extract a Video Frame
Grab a single frame from any video as a PNG image, right in your browser — pick a timestamp in seconds. Runs locally with ffmpeg, nothing is uploaded, free.
Freeze Frame Video Effect
Add a freeze-frame effect to a video: play up to a moment, hold that frame still for a set number of seconds, then continue. Free, in your browser.
Extract GPS Location from Video Metadata
Extract GPS location from MP4/MOV metadata: latitude, longitude, altitude, and a map link. Private in-browser parsing — no upload.
Convert a Video to Black and White
Free black-and-white video converter — turn a clip grayscale, sepia or cyanotype with adjustable strength and contrast. Runs locally in your browser, nothing uploaded.
Convert HDR Video to SDR
Tone-map an HDR (PQ/HLG, BT.2020) video down to SDR BT.709 so it stops looking gray, dim or washed-out. Runs in your browser with ffmpeg — nothing is uploaded.
Ken Burns Effect from a Photo
Turn a still photo into a short MP4 with a smooth pan-and-zoom (Ken Burns) move, right in your browser. Pick the motion, length and size — nothing is uploaded, free.
Mute a Video
Remove the audio track from a video right in your browser — lossless, no re-encode. Nothing is uploaded, free, no sign-up.
Mute Part of a Video
Silence the audio over a chosen time range in a video while keeping the rest of the sound and the picture untouched. Free, private, runs in your browser.
Remove Embedded Subtitles From Video
Strip all soft subtitle and caption streams from a video locally with ffmpeg stream copy — keep the video and audio intact, no upload and no re-encode.
Resize a Video
Scale a video to a target resolution right in your browser — set width and/or height, aspect ratio preserved. Re-encodes locally with ffmpeg, nothing is uploaded, free.
Rotate / Flip a Video
Rotate a video 90/180/270 degrees or flip it horizontally/vertically, right in your browser. Re-encodes locally with ffmpeg, nothing is uploaded, free.
Round the corners of a video
Round the corners of a video into a card-style clip. Choose pixel or percent radius, transparent WebM/MOV corners, or a solid-color MP4 background.
Split a Video into Scenes
Detect every scene change in a video and cut it into one clip per shot, with a CSV of the timings. Multi-pass ffmpeg runs in your browser — nothing is uploaded.
Set Video Keyframe Interval
Re-encode a video with a fixed keyframe interval — one keyframe every 2 seconds, or any GOP size in frames — for clean seeking and even HLS/DASH segments.
Detect Speech Segments in a Video
Run voice-activity detection on a video's audio in your browser and get speech vs non-speech timestamps as a report, CSV, SRT, or Audacity labels.
Stabilize a Shaky Video
Smooth out camera shake in a handheld video in your browser — pick a strength and how to handle the edges. Local ffmpeg stabilization, nothing uploaded.
Strip Video Metadata
Remove GPS, device, timestamp, title, comment, stream, and chapter metadata from a video locally with ffmpeg stream copy — no upload and no re-encode.
Compress a Video to a Target File Size
Set an MB budget and it computes the H.264 bitrate from your clip's length to fit under it — for Discord, email or WhatsApp. Runs in your browser, nothing uploaded.
Make a Timelapse From Video
Turn long footage into a fast timelapse in your browser. Pick a speed and output fps; frames are dropped with ffmpeg locally and audio is removed.
Add a Title or Lower Third to a Video
Add a styled title or lower-third caption to your video over a set time range — pick position, font size, color and a background bar. Free, in your browser.
Video to Animated WebP
Convert a short video clip to a looping animated WebP in your browser. Trim, resize, set fps and quality, or use lossless WebP with transparency preserved.
Convert Video to DNxHR MOV or MXF
Transcode a video to an Avid DNxHR editing intermediate. Choose DNxHR LB/SQ/HQ/HQX/444, wrap as MOV or MXF, optionally downscale, and write PCM or copied audio.
Video to GIF
Turn any video into an animated GIF right in your browser. Pick a section, set fps and width — high-quality palette, runs locally, nothing is uploaded, free.
Convert Video to H.264 MP4
Force-transcode any video to universally-playable H.264 High-profile MP4 (yuv420p, faststart, AAC) in your browser. Make clips that won't play work everywhere.
Convert Video to Broadcast MXF
Wrap or transcode a video into broadcast MXF. Choose XDCAM HD422, XDCAM HD, IMX 50/D-10, or rewrap; set raster, frame rate, and PCM audio locally.
Convert Video to ProRes 422 MOV
Transcode a video to an Apple ProRes 422 QuickTime MOV intermediate for editing. Pick Proxy, LT, 422, or HQ, downscale if needed, and keep uncompressed PCM audio.
Transcode a Video
Convert any video to MP4 or WebM right in your browser — pick a target format and quality. Re-encodes locally with ffmpeg, nothing is uploaded, free.
Trim a Video
Cut a clip out of any video right in your browser — set a start time and duration. Stream-copy (no re-encode), runs locally, nothing is uploaded, free.
Trim Black Frames from a Video
Automatically detect and trim the leading and trailing fully-black frames from a video. Two-pass ffmpeg blackdetect runs in your browser — nothing is uploaded.
Convert VFR to CFR
Convert a variable-frame-rate phone, screen or game recording to constant frame rate in your browser, and stop the audio drifting out of sync in your editor.
Convert a Voice Note
Convert WhatsApp, Telegram, Signal and other Opus/Ogg voice notes to MP3 or WAV, or encode audio back to Opus voice notes in your browser.
WAV Samples to JSON
Paste an uncompressed WAV as base64 or hex and get JSON: the sample rate, channels, bit depth and duration alongside the PCM samples as an array. Runs in your browser.
WAV to CSV Samples
Paste an uncompressed WAV as base64 or hex and export its decoded PCM samples to CSV: one column per channel, with a time or sample index. Runs in your browser.
WAV to NumPy NPY Converter
Paste WAV bytes as base64 or hex and export decoded PCM samples as a NumPy .npy array with dtype, shape, mono, order, and frame-window controls.
WAV to Raw PCM Extractor
Paste an uncompressed WAV as base64 or hex and get just its raw interleaved PCM bytes — header stripped — as base64, hex, or a C array.
Waveform Image from Audio
Turn any audio file into a waveform PNG in your browser — pick the size, solid or gradient wave colors and background, or keep it transparent. Nothing is uploaded.
Weak Password Detector
Check whether a password is one of the most common or breached passwords. Detects case and leetspeak variants, offline in your browser — nothing is uploaded.
Generate Webhook Signatures
Generate Stripe, GitHub, Slack, Shopify, Standard Webhooks, Svix, Square, Twilio, Paddle, or custom HMAC webhook headers from a raw payload and secret.
Weblog Attack Analyzer
Paste Apache, Nginx, or IIS access logs and flag SQLi, XSS, traversal, scanner user agents, sensitive probes, and high-volume offending IPs.
Weighted Random Sampler
Draw weighted random samples from CSV or JSON rows, with or without replacement. Seeded, reproducible, and browser-local.
Analyze an Exported WhatsApp Chat
Paste an exported WhatsApp chat to count messages per person, busiest hours and days, and top words and emoji. Fully in-browser — nothing is uploaded.
WireGuard Config Builder
Build a WireGuard wg0.conf from entered keys, addresses, endpoint and AllowedIPs, with every key, IP/CIDR and port range-checked.
WireGuard Key Generator
Generate WireGuard private, public and preshared keys locally, with a ready-to-paste wg0.conf snippet and JSON export.
Word Counter
Count the words, characters, and lines in any block of text. Free, instant, runs entirely in your browser — no sign-up required.
Word frequency counter
Count how often each word appears in your text and rank them by frequency, right in your browser. Skip short words, drop stop words, keep the top N. Free, private.
Summarize a Timestamped Worklog
Paste a timestamped worklog and total time by project, tag, day, or entry. Supports date ranges, CSV/JSON export, rounding, and open-entry handling.
Wrap Lines in Quotes
Wrap each line of text in quotes or brackets with an optional trailing comma — build SQL IN lists, JSON arrays, and CSV rows fast. Free, private, runs in your browser.
X25519 ECDH key agreement
Derive an X25519 (Curve25519) ECDH shared secret from your private key and a peer public key, then expand it with HKDF-SHA256/512. Runs in your browser.
XLIFF to JSON
Convert XLIFF 1.2 and 2.x files to JSON in your browser. Source/target pairs, flat or nested i18n bundles, placeholders preserved. Free, private, no upload.
XML Diff
Compare two XML documents structurally and see exactly what was added, removed or changed, with full element paths — in your browser. Nothing is uploaded.
XML formatter
Pretty-print or minify XML with indentation control and a well-formedness check, in your browser. Nothing is uploaded.
XML to CSV
Flatten repeated XML elements into a CSV table, with columns inferred from child tags and attributes, in your browser. Free, private, no upload.
XML to JSON
Convert an XML document into an equivalent JSON structure, preserving attributes and nesting, in your browser. Free, private, no upload.
XOR cipher
XOR text, hex, or Base64 data against a repeating key and output hex, Base64, or UTF-8. Symmetric encrypt/decrypt in your browser.
XPath query
Run an XPath 1.0 expression against XML or XHTML and return matching node values or serialized XML. Local browser WebAssembly tool.
Derive addresses from an extended public key
Derive receive and change Bitcoin addresses from an xpub, ypub, zpub, tpub, upub, or vpub. Watch-only, offline, and private in your browser.
Deep-merge YAML documents with Helm-style overrides
Deep-merge YAML documents left-to-right with Helm-style overrides. Choose array strategy, precedence, null deletion, key sorting and indentation.
YAML Formatter
Reindent and normalize messy YAML with consistent spacing. Pick indent width, sort keys, or switch between expanded block and compact flow style.
YAML Path Query
Query, set or delete YAML values by dotted and bracketed paths in your browser — dot keys, list indexes, quoted keys, JSON output, and comment-preserving edits.
Query YAML with jq-style filters
Query and transform YAML with jq-style filters in your browser — yq-like selection, mapping, slurp mode, YAML/JSON output, no upload.
YAML Resume to HTML
Turn a JSON Resume document written in YAML or JSON into one self-contained, print-ready HTML résumé with themes, accent color, fonts and page setup.
YAML to CSV
Flatten a YAML list or mapping of records into CSV with a unioned column header. Nested keys become dot-paths. Runs in your browser, no upload.
YouTube Takeout stats
Parse Google/YouTube Takeout watch-history JSON or HTML into top channels, repeated videos, monthly trends, weekdays, hours, streaks, CSV, and JSON.
YouTube Thumbnail Generator
Create a thumbnail PNG from a video frame with bold outlined headline text, a crop-to-canvas layout, and an optional accent bar.
Z-Score Calculator
Turn raw scores into z-scores with percentiles and normal-curve probabilities, invert them, find critical values, or standardize a pasted dataset.
Z-Score Normalize
Standardize a list of numbers with z-score, min-max, max-abs, or robust median/IQR scaling. Population or sample standard deviation, private and browser-local.
Zero Pad IDs
Paste a CSV, TSV or list of IDs and pad (or strip) leading zeros to a fixed width, so ZIP codes, SKUs and account numbers sort and join again. Runs locally.
Zero-width character cleaner
Detect and strip invisible zero-width spaces, joiners, byte-order marks, bidi controls and soft hyphens from pasted text, in your browser. Nothing is uploaded.
Zstandard Decompress
Paste a Zstandard (.zst) payload as Base64 or hex and read what's inside. Output as text, hex, or Base64, with size stats and frame details.
No tools match your search.