Binary to Text Converter Free Online Tool 2026

Last updated March 22, 2026

How Text Is Stored as Binary

Every character you type is stored in memory as a number, and that number is stored as binary. The mapping from characters to numbers is defined by a character encoding standard. The most common is ASCII (American Standard Code for Information Interchange), which maps 128 characters to 7-bit numbers (0–127). Modern systems use UTF-8, which is backward-compatible with ASCII for the first 128 characters but can encode over 1 million Unicode characters using 1–4 bytes per character.

ASCII Binary Reference

Decoding "Hello" from Binary

The word "Hello" in binary (8 bits per character, space-separated):

01001000 = 72  = 'H'
01100101 = 101 = 'e'
01101100 = 108 = 'l'
01101100 = 108 = 'l'
01101111 = 111 = 'o'

Result: Hello

JavaScript: Text ↔ Binary

// Text to binary
function textToBinary(str) {
  return str.split('').map(char =>
    char.charCodeAt(0).toString(2).padStart(8, '0')
  ).join(' ');
}

// Binary to text
function binaryToText(binary) {
  return binary.trim().split(/\s+/).map(byte =>
    String.fromCharCode(parseInt(byte, 2))
  ).join('');
}

console.log(textToBinary('Hi'));
// → "01001000 01101001"

console.log(binaryToText('01001000 01101001'));
// → "Hi"

UTF-8 and Multi-Byte Characters

For characters outside the ASCII range, UTF-8 uses multiple bytes. The euro sign € (U+20AC) encodes as 3 bytes: 0xE2 0x82 0xAC, which in binary is 11100010 10000010 10101100. Emoji like 😀 (U+1F600) use 4 bytes: 0xF0 0x9F 0x98 0x80.

This is why you can't simply split a UTF-8 binary string on every 8 bits to get characters — you need to respect the multi-byte encoding boundaries. The TextEncoder and TextDecoder Web APIs handle this correctly in browsers.