TrueType Fonts
TrueType Fonts in PDF
TrueType (TTF) fonts are embedded in PDF documents to ensure consistent rendering across viewers. When a font is not embedded, PDF viewers substitute a system font which may cause text reflow or incorrect character shapes.
Font Embedding
Aspose.PDF FOSS for Java embeds font data when creating documents that reference non-standard fonts. For PDF/A compliance, font embedding is mandatory for all fonts used in the document content.
Font Subsetting
Font subsetting embeds only the character outlines actually used in the document, reducing file size while maintaining correct rendering. Subsetting is applied automatically when the font contains more glyphs than are referenced.
Standard 14 Fonts
The 14 standard PDF fonts (Helvetica, Times-Roman, Courier, Symbol, ZapfDingbats,
and their variants) do not require embedding because they are guaranteed to be
available in all PDF viewers. They can be referenced by name in DefaultAppearance.