Network & web tools
IPs, CIDRs, DNS, URLs, HTTP and email — parse, build and analyze network and web data.
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.
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.
CSV Query
Query a CSV with SQL-style SELECT, WHERE, ORDER BY, and LIMIT — right in your browser. Free, private, no upload.
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.
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.
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.
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 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.
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 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 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.
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 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.
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.
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.
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.
JSONPath Query
Evaluate JSONPath expressions (RFC 9535) against any JSON in your browser — wildcards, slices, recursive descent, filters. Free, private, nothing uploaded.
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.
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.
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.
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.
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.
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.
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.
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.
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.
XPath query
Run an XPath 1.0 expression against XML or XHTML and return matching node values or serialized XML. Local browser WebAssembly tool.