When you see names like CIDFont+F1, F2, through F6 in a PDF's properties or in an error message, you are looking at "virtual" fonts created during the PDF export process. These are not standard fonts you can download from a website; rather, they are internal references generated by software like Adobe InDesign, Illustrator, or Microsoft Print to PDF. What These Font Names Mean
A CID (Character Identifier) font is a type of font format used primarily to handle large character sets.
The "F" Labels: The "F1, F2, F3..." suffixes are typically just internal, randomized abbreviations assigned in the order they were used by the exporting application. For example, in one document F1 might be Arial Bold while F2 is Arial Regular. In another document, those same labels could refer to entirely different fonts. Cidfont-f1 F2 F3 F4 F5 F6
Use Substitute Fonts: Manually replace them with Arial or Myriad Pro when prompted by your software; the appearance is often identical.
The subject line "Cidfont-f1 F2 F3 F4 F5 F6" refers to a specific classification of font files used primarily within the Adobe PostScript and PDF (Portable Document Format) environments. These identifiers are typically associated with CID-keyed fonts, a format designed to handle large character sets, such as those required for East Asian languages (Chinese, Japanese, and Korean) or complex expert sets. When you see names like CIDFont+F1 , F2
The "Missing Font" Problem: If you see these names instead of actual font names, your software is likely substituting a default font (like Arial) to display the text. This often causes the text to look "broken," appear as dots, or fail to be editable. Common Solutions for CIDFont Errors
Generate more content in a specific style (professional, futuristic, etc.) CID = A number (0 to 65,535) mapping
On older macOS systems (Classic OS 9 or early OS X), data fork fonts (DFONT) sometimes exposed internal resources as f1, f2, etc. A corrupt DFONT containing CID resources might list its suite as: