The sequence F1, F2, F3... is simply the standard naming convention used by PDF generation libraries (like Adobe Distiller, Ghostscript, or PDFKit) when encoding a document.
If you have ever opened a PDF only to see missing font warnings like "Cannot find or create 'CIDFont+F1'" or found that text renders as gibberish in a RIP (Raster Image Processor), you have encountered the CIDFont naming convention. This article provides a deep dive into what F1, F2, F3, F4, F5, and F6 represent, why "full" embedding fails, and how to resolve these issues once and for all. cidfont f1 f2 f3 f4 f5 f6 full
In many cases, these generic identifiers map back to standard system fonts. Users have frequently identified the following correlations: Often maps to Arial Bold Often maps to Arial Regular Other Substitutes: The sequence F1, F2, F3
: Often indicates that a font is supposed to be "Fully Embedded" rather than just a subset of characters. Common Issues This article provides a deep dive into what
You edited a text string that uses CIDFont+F2 , but your system does not have the original base font installed. The PDF viewer falls back to a different F-slot. Fix: Extract the embedded font using tools like pdftops (Xpdf suite): pdftops -fontdir ./extracted_fonts document.pdf
: Refers to "Character ID Fonts," a method for handling large character sets, such as those used in Asian languages or complex Unicode documents.