Binary Code Translator

Translate text to binary code and binary sequences back to readable text with ASCII/UTF-8 encoding support.

  • Conversion
  • Runs in your browser
  • Free, no signup

The guide

Tested tool guide Tested browser tools Checked August 15, 2026

What Binary Code Translator does, with a checked example

This tool converts characters to their binary form and back. Encoding mode takes each character, maps it to its ASCII or UTF-8 byte value, and writes that value as an 8-bit string of 0s and 1s, with a space between bytes. Decoding mode reverses this: it reads 8-bit groups, converts each to a byte value, and reassembles the bytes as text. The most common surprise is byte count on non-ASCII input - an accented letter or emoji is not one 8-bit group under UTF-8, it is two to four, because those code points don't fit in a single byte.

Worked example

A concrete input and expected output from the current implementation.

Input

Hi

Expected output

01001000 01101001

H is ASCII/UTF-8 byte 72 (01001000) and i is byte 105 (01101001); each character maps to one 8-bit group separated by a space.

How the result is produced

1

Text to binary

Each input character is converted to its Unicode code point, then encoded as one or more bytes (1 byte for ASCII characters, up to 4 for UTF-8 characters outside the ASCII range). Every byte's numeric value (0-255) is written as an 8-digit base-2 string with leading zeros preserved, and the groups are joined with single spaces.

2

Binary to text

The input is split on whitespace into 8-character chunks; each chunk is parsed as a base-2 integer to recover a byte value (0-255). The resulting byte sequence is then decoded as UTF-8 text. Chunks that aren't exactly 8 digits of 0s and 1s, or that don't form a valid UTF-8 byte sequence, produce an error or garbled output rather than a silent guess.

Good uses

  • decoding a binary string handed out in a CTF challenge or puzzle hunt
  • converting a word or short message into binary for a computer science exercise
  • checking how many bytes UTF-8 uses to represent a specific accented letter, symbol, or emoji

Limits and checks

  • characters outside plain ASCII (accents, CJK text, emoji) expand to 2-4 bytes each under UTF-8, so the output has more 8-bit groups than there are visible characters
  • decoding requires each group to be exactly 8 binary digits with no stray characters; binary copied from a source that wraps lines or drops leading zeros will not decode cleanly
  • a byte sequence that is valid binary but not valid UTF-8 (for example, a stray continuation byte with no lead byte) will fail to decode into text even though the binary itself is well-formed

Common questions

Why did one emoji turn into 32 binary digits instead of 8?

Most emoji sit outside the Basic Latin range and require 4 bytes under UTF-8 encoding, not 1. Four bytes means four 8-digit groups, 32 digits total. This is expected UTF-8 behavior, not a tool error - switching to an ASCII-only assumption would simply fail on that character.

Can I paste binary without spaces between bytes?

The decoder expects 8-digit groups to know where one byte ends and the next begins; a single unbroken run of digits is ambiguous unless the tool documents an assumption of fixed 8-bit chunking. If your source has no separators, re-insert a space every 8 digits before decoding.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.