Font language checker for missing character coverage

Choose a local font file or a font from the library, then read the result for each language separately. Full support means the file contains every standard and auxiliary letter listed for that language in Unicode CLDR, including forms used in accents, names and borrowed words. Core alphabet means the basic set is present while one or more additional forms are missing. A missing-letter result identifies characters that could fall back to another font when you type a word or sentence.

These labels describe character presence, not visual quality. The checker reads the font character map, which lists the glyphs included in the file; it does not assess accent positioning, shaping, kerning or whether the letters look consistent in a real line of text. If the language is important to a project, test representative words in the font tester as well. Inspect accented and less common letters, and confirm the actual rendered line in the software where the font will be used. For a name list, include the names with the most varied accents rather than testing only a common phrase; for a product interface, sample the labels users will see every day.

The font file is read in your browser and is not uploaded for this check. Library font pages show language badges based on the same CLDR source and full-support rule, so you can use the checker to understand a result and the library to explore other options. A badge is a coverage signal; it does not replace checking the typeface’s appearance, spacing or license for your intended project. Before a multilingual release, test a short sample from each language you need, including the less common letters that matter to names or place names. This helps catch a visual issue that character coverage alone cannot reveal.