CIDFont F1, F2, F3, F4, F5, and F6 are not actual font names you can "install" from a website. Instead, they are generic placeholders created by PDF generation software when a font is improperly embedded or "subset" in a document. Because these are randomized labels, there is no single file to download to fix the issue. Creative COW Why You See This Error
| Alias | Typical CIDFont | |-------|----------------| | F1 | HeiseiMin-W3 (Japanese) or Ryumin-Light | | F2 | HeiseiMin-W5 | | F3 | HeiseiKakuGo-W5 | | F4 | HeiseiMaruGo-W4 | | F5 | KozMinPro-Regular (Japanese) | | F6 | KozMinPro-Bold |
Download the Adobe Acrobat Reader DC Font Pack from the official Adobe website.
If you know what the font should be (e.g., the document looks like Arial), you can sometimes force a replacement. In professional tools like Adobe Acrobat Pro, you can use the Preflight tool to embed missing fonts or convert existing ones to a standard format. Summary Checklist