The terms CIDFont+F1, F2, F3, and F4 typically represent generic, auto-generated font placeholders that appear when a software application (like Adobe Illustrator or a PDF reader) cannot locate the original fonts embedded in a digital document. 1. What are CID Fonts?
CID (Character ID) encoding is a technology designed to support large and complex character sets—such as Japanese, Chinese, or Arabic—that exceed the limits of standard Western encodings.
When you dig into the file properties, you often see generic entries like F1, F2, F3, or F4. These aren't font names; they are internal references. And when they point to CIDFonts that are broken or embedded incorrectly, you have a problem.
Ensure "Embed All Fonts" is selected in your export settings.
CID Font F1 F2 F3 F4 Repack: A Comprehensive Guide for Designers and Font Enthusiasts