First, it's important to understand what a CIDFont is. In the context of a PDF, a "CIDFont" is not a specific typeface like Arial or Times New Roman. It is a container, or a sophisticated structure , designed to hold a collection of glyphs. This technology was developed by Adobe to overcome the limitations of older font formats and to efficiently represent large character sets, particularly those used for East Asian languages like Japanese, Chinese, and Korean (CJK).
If you authored the document and your clients or colleagues are seeing the "cidfont f1" error, you must re-export the file and ensure all fonts are fully embedded.
Commercial printing presses require all fonts to be fully embedded into a PDF to guarantee accuracy. Preflight software (like Adobe Acrobat Pro or Enfocus PitStop) will often flag "cidfont f1 normal fixed" as an , halting production because the printing press cannot verify how the characters should look. How to Fix and Resolve "cidfont f1 normal fixed" Issues
In Ghostscript’s source file gs_cidfn.ps , you will find: