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Although the current version of Python requires an option to open() to read/write UTF-8, [46] plans exist to make UTF-8 I/O the default in Python 3.15. [47] C++23 adopts UTF-8 as the only portable source code file format. [48] Backwards compatibility is a serious impediment to changing code and APIs using UTF-16 to use UTF-8, but this is happening.
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Python 3.15 will "Make UTF-8 mode default", [70] the mode exists in all current Python versions, but currently needs to be opted into. UTF-8 is already used, by default, on Windows (and elsewhere), for most things, but e.g. to open files it's not and enabling also makes code fully cross-platform, i.e. use UTF-8 for everything on all platforms.
The same character converted to UTF-8 becomes the byte sequence EF BB BF. The Unicode Standard allows the BOM "can serve as a signature for UTF-8 encoded text where the character set is unmarked". [76] Some software developers have adopted it for other encodings, including UTF-8, in an attempt to distinguish UTF-8 from local 8-bit code pages.
A UTF-8 file that contains only ASCII characters is identical to an ASCII file. Legacy programs can generally handle UTF-8 encoded files, even if they contain non-ASCII characters. For instance, the C printf function can print a UTF-8 string because it only looks for the ASCII '%' character to define a formatting string. All other bytes are ...
Binary data and text in any other encoding are likely to contain byte sequences that are invalid as UTF-8, so existence of such invalid sequences indicates the file is not UTF-8, while lack of invalid sequences is a very strong indication the text is UTF-8. Practically the only exception is text containing only ASCII-range bytes, as this may be ...
ISO-8859-1, Windows-1252, and the original 7-bit ASCII were the most common character encoding methods on the World Wide Web until 2008, when UTF-8 overtook them. [57] ISO/IEC 4873 introduced 32 additional control codes defined in the 80–9F hexadecimal range, as part of extending the 7-bit ASCII encoding to become an 8-bit system. [63]
Originally, both the Unicode and ISO 10646 standards were meant to be fixed-width, with Unicode being 16-bit and ISO 10646 being 32-bit. [ citation needed ] ISO 10646 provided a variable-width encoding called UTF-1 , in which singletons had the range 00–9F, lead units the range A0–FF and trail units the ranges A0–FF and 21–7E.