Binary Encoder / Decoder
Convert text to a binary bit string, or decode binary back to text — with byte delimiters and an optional 0b prefix. Decoding ignores spacing and prefixes, so any format round-trips. Runs entirely in your browser, no server, no sign-up.
What this tool does
Convert any text to a binary bit string, or decode a binary string back to the
original text — instantly, right in your browser. Every byte becomes eight 0/1
bits. Nothing is sent to a server: it runs locally, works offline, and needs no
sign-up. Pick a Mode, then optionally choose a byte delimiter or a
per-byte 0b prefix.
Modes
| Mode | What it does |
|---|---|
| encode (default) | Turns your text into binary — e.g. Hi becomes 01001000 01101001 (each byte is eight bits). |
| decode | Reverses it — turns a binary string back into the original text. Decoding ignores whitespace, delimiters, and the 0b prefix. |
Formatting options (encode)
| Option | What it does | Example |
|---|---|---|
| Byte delimiter | Inserts a separator between bytes — space (default), none, colon, dash, comma, or newline. | Hi · colon → 01001000:01101001 |
| Per-byte prefix | Adds 0b before each byte. | Hi · 0b + space → 0b01001000 0b01101001 |
Decode output — text or raw bytes
| Format | When decoding |
|---|---|
| text (default) | Renders the bytes as UTF-8 text (errors if they aren't valid UTF-8) |
| bytes | Shows the decoded bytes as a plain lowercase hex byte string — use this for binary data that isn't readable text |
Examples
| Input | Settings | Output |
|---|---|---|
Hi | encode | 01001000 01101001 |
Hello | encode · no delimiter | 0100100001100101011011000110110001101111 |
Hi | encode · 0b prefix · space | 0b01001000 0b01101001 |
01001000 01101001 | decode | Hi |
01001000:01100101:01101100 | decode | Hel |
FAQ
Is it free and private?
Yes — your input never leaves your device, and it keeps working offline once the page has loaded.
What encoding does it use for text?
Text is read and written as UTF-8, so
each character becomes its one-or-more UTF-8 bytes, and each byte becomes eight
bits. An emoji or accented letter therefore spans several bytes (é →
11000011 10101001).
Can I paste binary with spaces or 0b prefixes?
Yes. Decoding ignores ASCII
whitespace, the : - , delimiters, and the 0b prefix, so a string copied
from a hex dump, a debugger, or Python's bin() output decodes without editing.
Does the bit count matter?
Yes — after stripping formatting, the number of
0/1 bits must be a multiple of 8 (one byte per eight bits). A partial byte is
an error.
My decoded output looks garbled.
The bytes probably aren't UTF-8 text. Switch the Decode output to bytes to see the raw hex instead.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool binary-codec "Hello, world!"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/binary-codec/?input=Hello%2C%20world%21&mode=encode&format=text&delimiter=space&prefix=noneMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.