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PDF Fonts → JSON

Identify the declared/used fonts in a PDF (page resources) and export the list in JSON format, locally.

Import a PDF

No data is sent to a server: everything is done in your browser.

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About: PDF Fonts → JSON

Export the font inventory of a PDF to JSON format (types, encodings, subsets, resources per page) for technical audit, debugging, and automation.

Use Cases

  • Quick Resource AuditList all used fonts, their types, and encodings to understand a complex PDF.
  • Extraction & IndexingDetect cases where text extraction is fragile (absence of ToUnicode, non-standard encoding).
  • Print Preparation / PDF/AIdentify subset, non-embedded, or potentially problematic fonts.

What You Get

A structured JSON listing the fonts (BaseFont, Subtype, Encoding, embed/subset flags, ToUnicode if present).

Contextual information: page(s) of use, associated resources, object identifiers (if available).

Limitations and Points of Attention

  • The same font name may appear multiple times via different subsets.
  • Some information may be missing depending on the PDF generator (minimum font metadata).
  • For very large PDFs, the export can be heavy: filter later in the code according to your needs.

Frequently Asked Questions

Does this export include font files?
No: it describes the fonts and their properties. To embed a font, the PDF must be regenerated.
Why do the names look like “ABCDEF+Roboto”?
This is typical for subset fonts: a random prefix is added to avoid collisions.
What is the purpose of exporting to JSON?
To automate audits (CI), compare two PDFs, or enrich a technical diagnosis.

Tip

To investigate a rendering issue, pair this tool with “PDF Pages → JSON” to correlate fonts and affected pages.