Encode text as UTF-8 binary, or decode binary straight back to text. Live byte and bit counts, clear error messages, and a one-click copy.
🔒 Conversion runs locally in your browser, nothing is uploaded.
Move between human text and machine-level bits without losing accented letters, symbols or emoji.
Uses the same byte-level encoding your browser and operating system use, so multi-byte characters convert correctly.
Watch the byte count and bit count update as you type, useful for understanding storage size at a glance.
Malformed binary input is caught and explained clearly instead of producing broken or silent output.
Every piece of text a computer stores is ultimately represented as binary, a sequence of 0s and 1s. This tool uses UTF-8, the dominant character encoding on the modern web, which represents the basic English alphabet, digits and common punctuation as a single 8-bit byte each, while accented letters, many world-script characters, and emoji require two, three or even four bytes strung together. That is why a short message with an emoji in it can produce noticeably more binary output than its character count would suggest. When converting from binary back to text, the tool groups your input into 8-bit chunks, treats each chunk as one byte, and decodes the resulting byte sequence as UTF-8. If a chunk is not exactly 8 characters of 0s and 1s, or the resulting byte sequence is not valid UTF-8, the decoder stops and reports a clear error rather than guessing or silently producing incorrect characters. Understanding this binary representation is useful for computer science students, for anyone debugging encoding issues, or simply for the curiosity of seeing how the words on this page are actually stored.
Standard English letters, digits and punctuation each take exactly 8 bits in UTF-8.
Accented letters and emoji can take 2 to 4 bytes, which is why byte count and character count can differ.
A bit is a single 0 or 1. A byte is a group of 8 bits, the smallest common unit computers use to store one character.
It encodes your text as UTF-8 bytes and writes each byte as an 8-bit binary group. In Binary to Text mode, it reverses the process by reading 8-bit groups and decoding them as UTF-8.
UTF-8 uses one byte for basic English letters and digits, but characters like accented letters, symbols, or emoji can require two to four bytes, so they produce multiple 8-bit groups.
The converter checks that every group is exactly 8 characters of 0s and 1s. If a group is the wrong length or contains other characters, it shows a clear error instead of producing garbled text.
For decoding, whitespace between bytes is recommended and used automatically when present. For encoding, you can choose whether the output includes spaces between bytes or not.
Yes. It runs entirely in your browser using JavaScript, so your text never leaves your device, and there is no limit on how often you can use it.