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Font Fix PDFix: Unicode Repair

Font Fix PDFix is a free, 100% local Docker action that automatically detects and repairs Unicode-mapping and font-embedding defects under ISO 14289-1 Clause 7.21.7 and 7.21.4.1 — using OCR to restore PDF/UA and WCAG 2.1 compliance, with no data ever leaving your machine.

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Key Capabilities

  • Detects missing Unicode mappings across all embedded font types
  • Runs 100% locally via Docker – no cloud upload
  • Batch-processes multiple PDFs in one workflow
  • Uses OCR to recover the correct character for each unmapped glyph
  • Integrates into PDFix SDK action pipeline

Key Capabilities

  • Runs 100% locally via Docker, no data ever leaves your machine
  • Requires Docker running before install
  • Works directly inside PDFix Desktop
  • Fits into automation pipelines through the PDFix SDK

What Font Fix solves

  • Missing ToUnicode CMaps
  • CID font broken encoding tables
  • Glyph-width mismatches
  • Type 0 CID · Identity-H/V errors
  • .notdef glyph substitution
  • “Font not embedded” · 7.21.4.1-1
  • “Cannot be mapped to Unicode” · 7.21.7-1
  • OCR reconstruction when Unicode is missing

Action Summary

Free · LocalFont Fix PDFixAutomatically detects and repairs missing Unicode mappings in PDF fonts using OCR recognition technology.
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Frequently Asked Questions

Does Font Fix also fix fonts that aren’t embedded?

Yes – alongside Unicode-mapping errors (7.21.7), it repairs “font not embedded” errors (7.21.4.1-1).

Which PDF/UA checkpoints does this address?

ISO 14289-1 Clause 7.21.7 and 7.21.4.1, plus WCAG 2.1 Success Criterion 1.4.5.

Is Font Fix free and offline?

Yes, 100% free and runs entirely on your local machine via Docker.

Sources: ISO 14289-1:2014 (PDF Association) · WCAG 2.1 SC 1.4.5 (W3C) · Last updated July 2026

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