Check a font's Unicode block coverage

Thirty-one curated blocks, covering ranges like Basic Latin, Cyrillic, Arabic, Devanagari, Hiragana and CJK Unified Ideographs; it is a selected list rather than every block Unicode defines, since checking all roughly 300 would add more noise than signal on a tool page.

Because no font maps a glyph to a control code such as a C0 control or the delete character, so counting them in a block's size would cap every font at well under 100 percent for blocks like Basic Latin that include them.

It lists which of eleven common scripts, such as Latin-1, Cyrillic, Arabic or CJK, the font maps every single code point in, after control characters are excluded; a font missing even one code point in a script's range does not get listed as fully covering it.

No. This only checks whether the font's cmap table maps each code point to some glyph; it says nothing about whether the font can correctly shape combining marks, ligatures or complex scripts that need more than one glyph per character.

The font's cmap table alone, the same character-to-glyph map a browser or operating system consults; nothing about GSUB, GPOS or other layout tables is examined here.