Font File Validator
Verify a TTF, OTF, WOFF or WOFF2 file's structural integrity before you ship.
Runs entirely in your browser — no upload, no registration.
What this tool does
Reads the raw bytes, checks the file's magic number, table directory count, and the eight required OpenType tables (cmap, head, hhea, hmtx, maxp, name, OS/2, post).
Why you might need it
Corrupt or truncated font files silently break your site — this catches most damage in under a second.
How to use it
- Drop a font file below.
- Read each check.
- Green = pass, red = fail.
Supported formats
- TTF
- OTF
- WOFF
- WOFF2
- TTC
Always review the included licence before commercial use. Do not remove copyright records, designer names, licensing metadata or embedding restrictions from any font you process.
Frequently asked questions
Does this upload my font?
No — everything runs in your browser.
Can it fix a corrupt file?
No. It reports what's wrong; you'll need the original source or a converter to rebuild.