Here is a blog post explaining what they are and how to solve the "missing font" issue.
download random ZIP files from unknown blogs. Stick to GitHub, Google Fonts, or your OS’s built-in fonts. By installing the correct weight variants (Light, Regular, Bold, Heavy) and mapping them to F1-F4 in your software, you will eliminate missing font errors forever. cid font f1 f2 f3 f4 free link download
If you need a for CID fonts equivalent to F1-F4, do not search for shady file hosters. Go directly to the official source: Here is a blog post explaining what they
Check the document properties in Adobe Acrobat (File > Properties > Fonts) to see if the "Actual Font" is listed next to the F1-F4 labels. By installing the correct weight variants (Light, Regular,
The terms do not refer to a single downloadable font family like "Arial" or "Times New Roman". Instead, they are generic placeholders or "internal tags" automatically generated by software when a PDF is exported without properly embedding the original fonts.