The terms typically refer to generic internal labels assigned to missing or unembedded fonts within a PDF document. This often happens when a PDF is created by software that fails to properly embed the original font data or uses a "Character Identifier" (CID) system to map glyphs to a collection rather than using standard font names. Common Issues
This guide addresses the common confusion regarding "CIDFont+F1," "F2," "F3," and "F4" labels often seen when opening or editing PDF files. What are CIDFont F1, F2, F3, and F4? In most cases, these are not real font names
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In this extensive guide, we will dissect every aspect of the keyword —explaining what a CID font is, what the F1/F2/F3/F4 labels represent, how they are structured in PDF internals, common issues, and how to manage them effectively.
Uncheck for geometry fonts, converting them to geometry lines instead. How to Prevent This Error in Future Documents The terms typically refer to generic internal labels
Text streams then mix these: show Latin with /F1, Japanese runs with /F3, special symbols with /F4.
Let me search my memory: There's also the concept of "CIDFontType0" and "CIDFontType2", but not f1-f4. Perhaps the user is referring to the "Four-Character ID" or "Registry-Ordering-Supplement" triple. Or maybe it's about the "WMode" parameters? No. What are CIDFont F1, F2, F3, and F4
: Manually change the font of the affected text block to a common one like Arial or Roboto .
: The "CIDFont+" prefix often includes a string of random characters (e.g., AAAAAA+CIDFont+F1 ) to indicate that only a "subset" of the font—the specific characters used in that document—is embedded to save space. Common Issues and Solutions
If you are struggling with a "CIDFont+F1 missing" error, try these solutions from Smallpdf and Adobe Community : CID+ Fonts - Adobe Community
Here, references a Type0 CID font ( MS-Gothic-H ). Thus, CID Font F1 is the logical name used on that page to invoke that Japanese font.