Encodings / UTF-8 bytes

Binary Translator

Encode Unicode text as eight-bit UTF-8 byte groups, or strictly decode binary bytes without hiding malformed input.

Direction

Unicode text 0 / 20,000 UTF-16 units

Every Unicode scalar value is encoded as one to four UTF-8 bytes. Isolated UTF-16 surrogates are rejected.

UTF-8 binary bytes No result yet

Each byte is padded to eight bits. One ASCII space separates adjacent bytes.

Keyboard shortcut: Ctrl+Enter or Command+Enter runs the selected direction.

Choose a direction and enter data.

Byte rules

What the bits represent

ASCII A, 1 byte01000001

é, 2 bytes11000011 10101001

😀, 4 bytes11110000 10011111 10011000 10000000

Binary input grammar: Decode accepts only ASCII 0, ASCII 1, and ASCII space, tab, CR, LF, form feed, or vertical tab. Whitespace is ignored, and the remaining bit count must be a nonzero multiple of eight. Prefixes, commas, underscores, and other separators are errors.
Strict UTF-8: Decoding stops on the first malformed byte sequence. It rejects stray or missing continuation bytes, invalid lead bytes, overlong forms, UTF-8 encodings of surrogate code points, and values above U+10FFFF. It never inserts a replacement character.
Text preservation: Valid text round-trips by Unicode scalar value. Tabs and spaces are preserved. Browser text controls normalize pasted CR and CRLF line endings to LF before JavaScript reads them.
Limits and meaning: Text input is limited to 20,000 UTF-16 units and binary input to 180,000 units. Binary here is a display of UTF-8 bytes, not encryption, compression, numeric base conversion, or translation.