F4 [2021]: Cid Font F1 F2 F3

Extract the font using tools like pdftops (Xpdf) or mutool extract . Re-embed the missing CID font or substitute it with a compatible one (e.g., using Ghostscript’s -dNOPLATFONTS ).

List all fonts in a PDF, showing if they are CID and their internal names: cid font f1 f2 f3 f4

To understand the depth of F1 through F4, one must understand what they represent in the PDF architecture. Extract the font using tools like pdftops (Xpdf)

If you only need to view or print the file (and don't need to edit the text), use the Transparency Flattener in Adobe Illustrator to convert the text into shapes (outlines). This removes the need for the font entirely. cid font f1 f2 f3 f4