If you have ever encountered an error message like "CIDFont+F1 cannot be created or found" or opened a PDF in only to see text replaced by dots or generic boxes, you have encountered CID-keyed fonts . Despite the technical-sounding name, CIDFont+F1, F2, F3, and F4 are not specific typeface names like Arial or Helvetica. Instead, they are generic placeholders created by PDF exporting software when it cannot properly embed or name the original font. What is a CID Font?
: PDFs that combine various global scripts. cid font f1 f2 f3 f4
: Modern OpenType fonts often get converted into CID encoding when they are embedded into a PDF to ensure all characters display correctly. Decoding "F1, F2, F3, F4" If you have ever encountered an error message