: These are "virtual" font names assigned by apps like Adobe Illustrator or Acrobat when a font is re-encoded during PDF creation.
While the numbers are arbitrary (they simply count fonts), they often correlate with the order of appearance or role of the font in a structured document. Here is how advanced users interpret them to build workflows:
cpdf -subset-fonts input.pdf -o output.pdf
In the context of PDF files, , F2 , F3 , and F4 are not specific font "brands" you can download, but rather internal placeholder names generated by software during the PDF export process.
Here are the best practices for optimizing, embedding, and ensuring font compatibility for CID-keyed fonts. A. Prioritize Full Embedding over Subsetting cid font f1 f2 f3 f4 better
The "better" designation stems from their superior handling of character-heavy, complex, and internationalized content. 1. Superior Support for Large Character Sets (CJK)
: Software often assigns these names (F1, F2, etc.) when it cannot decode or find the original font name during export.
Click Help in the top menu bar, then select Check for Updates . Install any pending updates and restart your computer.
(e.g., Adobe’s CJK fonts, Noto CJK).
: To keep file sizes small, software often only embeds the specific characters used in that document. When this happens, the original font name (like Arial or Calibri) is often replaced with a generic ID like CIDFont+F1 . Which one is "better"?
This process breaks down complex CID font structures into flat, universally readable visual elements.
represents the secondary font (like bold text or headings).
: Check the document properties in Adobe Acrobat (File > Properties > Fonts) to see if the actual font names are listed alongside the placeholders. : These are "virtual" font names assigned by
If a PDF is displaying correctly but won't let you search or copy text, you can force the system to rebuild the font structures. Open the PDF in your browser or viewer. Select (Ctrl+P or Cmd+P).
The error "Cannot find or create the font 'CIDFont+F1'" usually occurs because: CIDFont+F1 issue - Adobe Community
Look for the "Type" column: CIDFontType0 or CIDFontType2 . Then inspect the "CMAP" column. If you see Identity-H but the language is Japanese, no direct conversion is possible without a custom CMAP.