UCS Transformation Format—8-bit (UTF-8) is a Unicode character encoding. Codes 0-127 (0-7F hexadecimal) represent the equivalent ASCII characters, and these codes in a UTF-8 stream are never used in any other context. Codes FE and FF are never used, except in the optional Byte Order Mark at the beginning of a document. In UTF-8 the BOM is encoded as the bytes 0xEF, 0xBB, 0xBF. Since UTF-8 has no "endianness," this is not actually a byte order indicator but can be treated as a signature indicating the document is UTF-8 encoded.
- STD 63
- Unicode 6.0, Chapter 3 (2011) – §3.9 D92, §3.10 D95
- ISO/IEC 10646:2003 Annex D (2003)