Binary Text Encoder/Decoder - Text to Binary & Back

How to use this tool

1. Enter input. Type text or paste binary data. The direction is auto-detected.
2. Choose separator. Select space, comma, or none as the separator between binary groups.
3. Read output. The converted output appears instantly in the output box.
4. Copy result. Click Copy to copy the result, or Swap to translate back.

How binary text encoding works

Every character in digital text is stored as one or more bytes (8 bits). This tool converts text using UTF-8 encoding (the dominant character encoding for the web), then represents each byte as an 8-bit binary number (e.g., A = 65 = 01000001).

A character and a byte are not always the same thing. The letter é takes two UTF-8 bytes, while the emoji 😀 takes four. The byte grid groups those bytes under the character that produced them, so every bit cell corresponds to one real byte in the converter output.

The UTF-8 byte formats panel shows those same values in binary, hexadecimal, decimal, and octal. For example, the byte for A is 01000001 in binary, 41 in hexadecimal, 65 in decimal, and 101 in octal. Comparing these forms is useful when reading a protocol trace or checking an assignment that specifies a number base.

Common binary values

• A = 01000001 (decimal 65)
• Z = 01011010 (decimal 90)
• a = 01100001 (decimal 97)
• 0 = 00110000 (decimal 48)
• Space = 00100000 (decimal 32)

Use cases

• Education: understand how computers store text at the bit level.
• Puzzles and ciphers: encode messages in binary for challenges or games.
• Low-level debugging: inspect raw byte values of a string.
• Protocol analysis: visualize binary framing in communications protocols.

Multi-byte UTF-8 characters

ASCII characters (code points 0–127) each fit in a single byte. Characters outside this range require multiple bytes in UTF-8. For example:

• é (U+00E9) encodes as 2 bytes: 11000011 10101001 (0xC3 0xA9)
• € (U+20AC) encodes as 3 bytes: 11100010 10000010 10101100
• 😀 (U+1F600) encodes as 4 bytes, starting with 11110000

The leading bits of the first byte signal how many bytes form the sequence: 110… = 2 bytes, 1110… = 3 bytes, 11110… = 4 bytes. Continuation bytes always begin with 10….

Bit numbering convention

This tool displays bits in MSB-first (most significant bit first) order, which is the standard for written binary representation. Bit 7 (value 128) is on the left; bit 0 (value 1) is on the right.

Some hardware protocols and embedded systems datasheets use LSB-first (least significant bit first) ordering instead. If you are comparing output with a hardware datasheet, verify the bit order used before drawing conclusions.

When decoding, enter complete 8-bit groups separated by spaces or commas, or use the compact option for a continuous stream that can be split every eight bits. The decoder rejects partial and oversized groups, and it reports malformed UTF-8 instead of silently replacing invalid bytes. The displayed byte values are still available in all four bases for inspection.