Binary to Text Converter

Quick answer

Binary to text groups bits into bytes and decodes them as UTF-8. 01001000 01101001 00100001 is 'Hi!', since 01001000 = 72 (H), 01101001 = 105 (i) and 00100001 = 33 (!).

Enter binary in groups of 8 bits. The calculator returns the decoded text.

Related tools: Binary Calculator: Add, subtract, multiply, divide or apply bitwise operations to binary numbers. Hex to Text Converter: Decode hexadecimal bytes as UTF-8 text. Hex Calculator: Add, subtract or multiply hexadecimal numbers.

How to use the Binary to Text Converter

1. Type binary bytes, for example 01001000 01101001.
2. Press Calculate to see the result, and use Reset to start again.

Formula and method

Separate bytes with spaces.

Worked examples

These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.

The first line is the headline result (text). IEEE-754 double precision; shown to the decimals indicated.

How to read it

Each byte is an ASCII code for plain English text: 'A' is 01000001 (65). Multi-byte UTF-8 sequences represent accented letters and symbols: 'é' is 11000011 10101001.

Errors

The number of bits must be a multiple of 8, and invalid UTF-8 is rejected rather than guessed. Spaces between bytes are fine. Binary doesn't encrypt anything: it is only a representation.

Bytes, ASCII and UTF-8

Each group of 8 bits is one byte. 01001000, 01101001 and 00100001 are 72, 105 and 33, which are the ASCII codes for H, i and !, so the text is Hi!. Plain ASCII characters use one byte in UTF-8.

Characters outside ASCII use two to four bytes: é is 11000011 10101001. Cutting a multi-byte character in the middle, or entering a group that is not exactly 8 bits, produces wrong text or an error, so keep the groups complete.

What happens with invalid input

These messages are produced by the calculator itself, so you know what to fix.

• Binary bytes: left empty shows "Enter binary bytes." beside that field and no result.

Choosing between the Binary to Text Converter and similar calculators

Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.

Background: number systems

To convert a whole number from decimal to another base, divide repeatedly by the base and read the remainders backwards; to convert to decimal, multiply each digit by the base raised to its position (counting from 0 at the right) and add. Each hexadecimal digit equals exactly four bits and each octal digit three, so binary converts to hex by grouping bits in fours from the right.

255 in decimal is 11111111 in binary and FF in hexadecimal.

Assumptions and limitations

• Invalid UTF-8 is rejected

If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for binary bytes to confirm this.

Related calculators

• Binary Calculator — Add, subtract, multiply, divide or apply bitwise operations to binary numbers.
• Hex to Text Converter — Decode hexadecimal bytes as UTF-8 text.
• Hex Calculator — Add, subtract or multiply hexadecimal numbers.
• Two's Complement Calculator — Two's-complement representation of an integer in a fixed bit width.
• Number Base Converter — Convert a number between bases 2 and 36.
• IP Subnet Calculator — IPv4 network, broadcast, mask and host range from an address and CIDR prefix.

Sources

• RFC 20, ASCII format for Network Interchange (IETF, 1969)
• RFC 3629, UTF-8, a transformation format of ISO 10646 (IETF, 2003)

Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.