Instead, these names are internal generic placeholders used by PDF generators and printers. When a system cannot find or read the actual font used in a document, it defaults to labels like "F1" or "F2".
from a browser to see if it flattens the fonts into shapes. To help you resolve this more quickly, could you tell me: What language is the document written in? What software gave you the error message? Cid Font F1 F2 F3 Free Download
The font CIDFont+F1 is Arial (blod) and CIDFont+F2 is Arial (Regular) CIDFont+F1 issue - Adobe Community Instead, these names are internal generic placeholders used