How to use PDF Font Checker
- Choose one PDF within browser safety limits.
- Review every measured fact and unknown limitation.
- Use a linked existing tool only when a supported finding needs action.
PDF Font Checker
Identify fonts used by searchable PDF text, subset names, page usage, and supported embedding evidence without uploading the file.
The PDF and diagnostic facts stay in browser memory. The source is not modified, uploaded, or saved, and embedded actions are never executed.
Add a PDF sourceOne PDF · 100 MB and 300 page safety limitsChoose from your device or drag and drop a file here.
Identify fonts used by searchable PDF text, subset names, page usage, and supported embedding evidence without uploading the file. Results are evidence-based, and any fact the current parser cannot establish remains labeled unknown.
How OpenFileTools processes it
Local processing, explicit choices.
The managed PDF.js session reads searchable-text fonts, page geometry, and image-paint operators in memory. Reused raster placements are measured independently at their displayed size. Embedded actions are never executed.
Questions, answered.
Is my PDF uploaded?
No. PDF bytes and diagnostic results stay in this browser tab.
Does this change the PDF?
No. These diagnostics are read-only.
Why does a check say unknown?
OpenFileTools reports unknown instead of guessing when the browser parser does not expose reliable evidence.