In PDF document structures, CIDFont+F1, F2, F3, and F4 are internal labels assigned by PDF-generation software (like Adobe Distiller or Microsoft Print to PDF) when it cannot or chooses not to embed the original font names. These are not "real" font names you can find in a standard font library; rather, they are placeholders for Character Identifier (CID) fonts used to handle large character sets or encoding issues. Breakdown of CID Font Labels
CID stands for Character Identifier. Traditional font encoding systems (like Type 1 or TrueType) were designed for languages with small character sets (e.g., Latin alphabet: 26 letters). However, languages like Japanese (Kanji), Traditional Chinese, and Korean have thousands of characters. Encoding each glyph directly would be inefficient. cid font f1 f2 f3 f4
Search Failures: If the font encoding is broken, you may be unable to use Ctrl+F to search for text. Recommended Solutions In PDF document structures, CIDFont+F1 , F2 ,
Here is a deep dive into the quiet tragedy of the CID Font. Traditional font encoding systems (like Type 1 or