Cidfont F1 F2 F3 F4 F5 F6 Fixed Here

The labels are simply shorthand aliases generated by the PDF engine.

[Original Design Software] ──(Font Substitution during Export)──> [Corrupt PDF Asset] │ ┌─────────────────────────────────┴────────────────────────────────┐ ▼ ▼ [Reader Lacks System Fonts] [Incomplete Subset Embedding] The viewer app cannot find the Only a partial glyph table exists; original font files locally. text cannot be rewritten/edited.

The following are some key characteristics of CID fonts F1, F2, F3, F4, F5, and F6: cidfont f1 f2 f3 f4 f5 f6

Because CIDFont+F1 is not a real font, your computer has no idea what the letters or characters should look like. This leads to several common issues:

Embed the required CIDFont or map F1 to a valid system font using fontconfig or a substitution table. The labels are simply shorthand aliases generated by

By inspecting your PDF’s font dictionary, using tools like pdffonts and Ghostscript’s cidfmap , and embedding proper CIDFonts, you can eliminate the ambiguity of F1–F6. Treat them as warnings—not as actual font names—and your documents will render consistently everywhere.

Errors typically occur when your PDF viewer cannot find the original font on your system and the PDF itself doesn't have the font "embedded" (stored inside the file). This often results in: CID+ Fonts - Adobe Community The following are some key characteristics of CID

with "Outline Text" checked can bypass font dependency by turning text into vector shapes. CIDFont+F1 issue - Adobe Community

Inside a PDF file, the page's content stream contains instructions for rendering text. One common instruction looks like this:

When the font program is missing or not embedded, and the software needs to name the CIDFont dictionary, it often names it based on this resource key, creating CIDFont+F1 , CIDFont+F2 , and so on.