When a PDF creator saves a file, they can choose to "embed" the fonts. If they do not, your PDF reader must guess what the font is. If your system lacks the specific CJK font pack, it throws a CID Font F1 error. 2. Corrupted PDF Export
A CID-keyed font in a PDF is a combination of two essential components:
From a forensic data perspective, the CID Font F1 Family has specific, predictable properties. If you are writing a parser or analyzing a PDF with pdf-parser.py or qpdf , look for these attributes: cid font f1 family
CID-keyed fonts bypass character names entirely. Instead of mapping names to glyphs, they reference glyphs using unique index numbers called Character Identifiers (CIDs).
If you are dealing with a document or print job plagued by CID Font F1 issues, use these steps to resolve the problem: For Document Creators (Preventing the Issue) When a PDF creator saves a file, they
Therefore, "CID Font F1" simply means It could map to a Japanese Gothic font, a Chinese Mingti font, or even a corrupted Western font fallback. Why Do CID Font F1 Errors Happen?
While 256 slots are plenty for the English alphabet, punctuation, and a few accented characters, it is entirely inadequate for East Asian scripts. Chinese, Japanese, and Korean (CJK) languages require tens of thousands of unique glyphs to be usable. The CID Solution Instead of mapping names to glyphs, they reference
Select or Save as PDF as your printer destination.
: They separate the glyph outlines (the visual shapes) from the character encoding (how the computer maps a keystroke to a shape), allowing for more flexible cross-platform rendering . Why "F1" or "F2" Appears
In a PDF object representation: