Font Language Support Checker - Test Font Glyphs Online
What is Font Language Support Checker?
Our Font Language Support Checker is a professional client-side utility that inspects custom font files (.ttf, .otf, .woff, .woff2) or local system fonts to verify their character coverage. It checks if the font contains correct glyphs for tone marks, accents, and unique characters of various writing systems (like Vietnamese diacritics, Cyrillic, Hangul, Kana, and Hanzi). Using high-performance Canvas measurement algorithms, it scans fonts instantly and 100% offline.
Key Advantages of Font Support Checker
- •100% Client-Side & Private: Font files are processed entirely inside your browser. No files are uploaded to any server.
- •Tone & Accent Validation: Specifically checks Vietnamese diacritics (dấu tiếng Việt) and European accents to ensure perfect typography.
- •Accurate Fallback Detection: Identifies missing glyphs by comparing font measurements against fallback systems.
- •Uploaded & System Fonts: Upload your own font files or type any system font name (e.g. Helvetica, Segoe UI) to test.
- •Detailed Missing List: Displays exact missing characters so you can fix font files or choose alternatives.
How to use Font Language Checker
- Step 1: Upload a font file using the drag-and-drop box, or type a local system font family name.
- Step 2: View the support statistics dashboard showing coverage percentages for each language.
- Step 3: Click on any language row to expand details, showing which characters are supported and which ones are missing.
- Step 4: Type your own custom text in the Live Preview area at the bottom to test look-and-feel.
- Step 5: Load different fonts to compare and find the perfect typography for your multi-lingual website.
Thank you for analyzing fonts with Any Free Online Web Tools! Keep your typography pristine.