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Font Coverage Comparator
Compare two fonts using their preferred default Unicode character maps.
Two fonts in left/right picker order
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the displayed example values,or choose the local input files requested by the controls. Optional source files take precedence where labelled.
- Choose Compare default coverage and inspect the complete result and any reported limitations.
- Use Download result and each companion download link to save complete outputs. Reset clears output and restores example controls.
Examples
Choose the required local file using the displayed input control.
Limitations
- Compare complete default Unicode cmap code-point sets of exactly two single-font TTF,OTF or WOFF files. Return every shared/left-only/right-only code point and selected platform/encoding/format. Reuse existing bounded SFNT/WOFF readers;default preference matches FontTools/HarfBuzz,choosing the first matching platform subtable. Supported cmap0/4/12/13;unsupported preferred formats refuse rather than falling back. Exclude glyph0,out-of-range glyph IDs and surrogates. No variation-selector,shaping,sequence,language,fallback,rendering,license or complete font-validity claim. WOFF2/collections are unsupported.10 MiB per file/20 MiB combined,200,000code points per font,JSON20 MiB. All processing stays in your browser.
- Complete outputs only. Unsupported or oversized input is refused. Follow the displayed job-specific bounds and format policies.
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