: The text displays in a generic replacement font that may mess up the layout. How to Fix Impossible fonts to be found / Fontes impossíveis de achar
The designations "F1" through "F6" are generic placeholders. When a software program (like a PDF generator or an editor) cannot embed the actual name of a font or its subset, it assigns these internal aliases to different font styles within the document: cidfont f1 f2 f3 f4 f5 f6 full
Frequently used for Arial Regular or Times New Roman Bold . Decoding CIDFont F1 F2 F3 F4 F5 F6
This error highlights the relationship between the identifier (F1) and the font data. Here is what typically happens when a PDF engine processes a CIDFont labeled : Use subsetting when: Mangled rendering : The text
✅ Unless required for editing, subsetting (removing "full") reduces file size by 60–90%.
It seems you're asking for a review or explanation of (Character ID fonts), specifically looking into variants labeled F1, F2, F3, F4, F5, F6 — possibly in the context of PostScript , PDF , or printer firmware (like Canon, Ricoh, or HP’s implementation of CID-keyed fonts).