UTF-8 Codepage Layout Charset

 

Legend: yellow cells are control characters, blue cells are punctuation, purple cells are numbers and green cells are ASCII letters.

Orange cells with a large dot are continuation bytes. The hexadecimal number shown after a "+" plus sign is the value of the 6 bits they add.

White cells containing a large single-digit number are the start bytes for a sequence of that many bytes. The unbolded hexadecimal code point number shown in the cell is the lowest character value encoded using that start byte (this value can be greater than the value which would be obtained by following the start byte with continuation bytes which are all 128 (hex 0x80), if this would result in an invalid overlong form).

Red cells must never appear in a valid UTF-8 sequence. The first two could only be used for overlong encoding of basic ASCII characters. The remaining red cells indicate start bytes of sequences that could only encode numbers larger than the 0x10FFFF limit of Unicode. The byte 244 (hex 0xF4) could also encode some values greater than 0x10FFFF; such a sequence is also invalid.

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