How to use TTF / OTF / WOFF Font Inspector: a practical file-check workflow
Open a real file with TTF / OTF / WOFF Font Inspector and check important fields, output, format boundaries, and local privacy.
When to use it
Use this read-only tool when web or print output has missing glyphs, name conflicts, or unexpected variable-font behavior and you need to inspect internal mappings and names. A one-line preview cannot prove character coverage, embedding rights, or correct metrics. This tool reads internal font tables but does not replace the license text.
Practical example
Search a target character and code point, confirm cmap maps it to a glyph other than .notdef, then inspect family/subfamily, PostScript name, fsType embedding bits, and the wght axis range. Metadata still does not replace the license.
Steps
- Choose a TTF, OTF, WOFF, or WOFF2 font.
- Review family, subfamily, PostScript name, version, and copyright records.
- Search a Unicode character and inspect its mapped glyph.
- Test text, kerning, and variable axes; export or embed only when licensed.
Result checklist
- The target character has a Unicode cmap mapping that is not .notdef
- Family, subfamily, and PostScript names do not collide with another font
- Version, copyright, license URL, and embedding bits are recorded
- Variable-axis min/default/max are plausible and the test value is in range
First troubleshooting checks
Preview text still uses the system font
The target glyph may be absent and fall back; confirm the glyph mapping rather than visual appearance alone.
WOFF2 cannot be parsed
Browser decoding or font tables may be incompatible; try the original TTF/OTF and confirm the download was not HTML/CSS.
Real limitations
- Font metadata is not complete legal permission
- Complex GSUB/GPOS, color glyphs, and hinting may be partially represented
- No circumvention of encryption, DRM, or embedding restrictions
Privacy and file safety
Parsing runs in the current browser tab and the file is not uploaded to FreeTool to use this tool. Still use a trusted device for customer, engineering, research, or medical material. Keep the original unchanged and clear downloads, screenshots, and browser data after a shared device.