The "F1, F2, F3, F4, F5, F6" suffix does not refer to specific font styles (like Bold or Italic). Instead, it likely indicates within a RIP (Raster Image Processor) or a DTP (Desktop Publishing) application.
Unlike standard Western fonts that rely on a 256-character limit (defined by ASCII or ANSI encoding), CID-keyed fonts are designed to support thousands of characters. In a CID system: Cidfont-f1 F2 F3 F4 F5 F6
Look for output lines listing CIDFontType0C and names like CIDFONT+F1 . The "F1, F2, F3, F4, F5, F6" suffix
(and F2, F3, etc.) are generic placeholder names. When a program creates a PDF but doesn't properly "embed" the full font name to save space, it often gives them these "anonymous" labels. The Mystery: In a CID system: Look for output lines
: These suffixes typically refer to different styles or weights of the original font used in the document (e.g., F1 might be Arial Bold, while F2 is Arial Regular). Why You Are Seeing Them
If you work in prepress or PDF engineering, seeing Cidfont-f4 in a preflight report is a red flag. It means fonts are and output will be inconsistent across different printers.
If you can see the text but can't save or print it correctly, open the file in a browser (like Chrome) or (on Mac). Choose Print , but select Save as PDF as your printer. This often flattens the fonts and "bakes" them into the new file. 2. Identify the Original Font