If you only have the broken PDF file, you can try rebuilding it using an open-source command-line tool like Ghostscript to substitute generic fallback fonts. Install Ghostscript on your machine.
Instead, they are created by the software that generated the PDF.
Look for the fonts listed; the real name is usually parenthesized next to the F-alias. How to Fix CID Font Display Errors Cid Font F1 F2 F3 F4 F5 Free Download
⚠️ These labels vary by manufacturer. In Canon’s printing system, F1–F5 refer to fixed, non-editable, printer-resident fonts. You cannot "download" them as separate installable font files—they are firmware-based.
Once you've downloaded the Cid Font package, installation is a breeze. Here's a step-by-step guide: If you only have the broken PDF file,
CID fonts are a type of font format developed by Adobe to handle character sets with thousands of glyphs, such as Chinese (Simplified/Traditional), Japanese, and Korean (CJK). Unlike traditional PostScript fonts, CID fonts offer efficient rendering for large character sets.
Open the document in a browser, click Print , and select Save as PDF or Microsoft Print to PDF . This sometimes forces the system to convert the problematic CID glyphs into standard vector shapes. Look for the fonts listed; the real name
Therefore, searching for a font named "F1" to download is impossible, because "F1" is just an arbitrary label assigned to a completely different font embedded within that specific file.
There are three common reasons why your PDF reader is failing to display these fonts:
