Font Embedding and Subsetting
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Definition
Section titled “Definition”A PDF can either reference a font by name or embed the font’s data inside the file. Embedding means the document renders the same on any machine, even one that has never seen the font. Subsetting goes further and embeds only the glyphs the document actually uses, which keeps the fidelity without paying for the entire typeface — a document using three characters of a CJK font does not ship megabytes of glyphs it never draws.
Example
Section titled “Example”A report set in a corporate font, opened on a laptop that does not have it installed. With the font embedded, the report looks exactly as designed. With the font merely referenced, the reader substitutes something else and the headings shift — sometimes enough to break a layout or push content across a page break.
In the PDFLean tools
Section titled “In the PDFLean tools”- list the fonts in a PDF — checks which fonts a file references and whether they are embedded or subset
- add headers and footers to a PDF — automatically embeds font subsets for CJK header text
Related reading
Section titled “Related reading”- Page Content Stream — where the drawing instructions that use fonts live
- PDF Metadata — the other invisible cargo a file carries
- Supported Formats — the formats whose handling depends on font embedding