macOS
These are generic internal aliases generated by PDF export engines (like Adobe Acrobat , XeLaTeX, or web renderers). Because the system fails to identify or pull the real font name (e.g., Arial, Calibri, or Helvetica), it assigns placeholder variables sequentially: F1 for regular text, F2 for bold, F3 for italics, and so on.
Many installers use PDF-based manuals or splash screens. If the PDF was exported with "Subset Fonts" enabled, and the repackaging process corrupted the embedded font data, the viewer cannot render the text.
A (or "re-encapsulation") is the process of extracting the CID font subsets (F1–F4) from a problematic PDF and either: cid font f1 f2 f3 f4 repack
Closing practical note
Repacking cleans out the corrupted font headers and strips away the broken multi-byte CID references. It replaces them with a clean, standard font layout (like TrueType or OpenType) that any PDF reader can render instantly. How to Fix CID Font F1–F4 Errors: A Step-by-Step Guide
Limitations: Acrobat may not fully rebuild CID subsets if the CMaps are severely corrupt. macOS These are generic internal aliases generated by
Ultimately, encountering CIDFont+F1 is a common, yet resolvable, issue. By understanding that this placeholder is a generic sign of a missing font and using the step-by-step methods above to repack your document, you can restore full functionality and legibility to your problematic PDF files.
For many users, a simple and effective solution is to open the problematic PDF with the app and then use the "Export as PDF" function. This process often re-encodes the document and successfully re-embeds the necessary fonts, resolving the issue.
If you have the .cid files (often .fnt or .cid extensions) but the software can't find them, you may need to map them manually in your application’s font configuration settings. 4. Summary Table Scrambled text/boxes Install CJK fonts; Re-create PDF with embedding. MicroStation Error on load Check/regenerate font.map . AutoCAD/Plot Missing font error Install required TrueType fonts ( .ttf ). General "Repack" requested Re-install fonts and restart the application. 5. Conclusion If the PDF was exported with "Subset Fonts"
// iText 7 example - Force full CID embedding PdfFontFactory.FontEncodeing = PdfEncodings.IDENTITY_H font.setSubset(false);
The fonts defined in the drawing (e.g., Japanese or Chinese character sets) are not installed on the local machine.