The "CID Font F1, F2, F3, F4" labels often appear as a technical byproduct when PDF files are created or exported from professional design software like Adobe InDesign or Illustrator. These labels are not the original font names but rather generic placeholders assigned by the PDF generator to identify specific font subsets. 🛠️ The Purpose of CID Encoding
In the page’s /Resources: /Resources << /Font << /F1 10 0 R >> >>
Using Command Line (pdffonts - Linux/macOS): cid font f1 f2 f3 f4
Seeing these names often indicates a missing font or an embedding error, which can make editing the text difficult.
Convert or repair CID fonts:
Install the Correct Fonts: Check the document properties (Ctrl+D or File > Properties > Fonts) to see if the original font names are listed next to the CID labels.
If you have ever opened a PDF in software like Adobe Illustrator or Acrobat and been greeted by an error about missing fonts named CIDFont+F1, F2, F3, or F4, you aren't alone. These aren't actually real font names you can go out and download. The "CID Font F1, F2, F3, F4" labels
Font Mapping and Substitution: When working with documents that use specific fonts like CID fonts, font mapping or substitution might occur if the target system doesn't have the exact font. This could involve F1, F2, F3, and F4 referring to fallback or substitute fonts.
Bottom line: cid font f1 f2 f3 f4 is a generic internal label, not a real font. If you see it in a PDF error or font list, you need to locate the underlying base font (e.g., via the /BaseFont entry) to know what you're really dealing with. Using Command Line (pdffonts - Linux/macOS): Seeing these