Whether you're a designer trying to edit a client's PDF or a developer digging through document properties, seeing font names like , F2 , F3 , or F4 can be frustrating.

. This keeps the appearance perfect but makes the text uneditable. Export via Preview (Mac) : Opening the PDF in macOS Export as PDF

The CID-keyed font format has continued to evolve. Modern implementations as OpenType/CFF fonts represent the current state-of-the-art in multilingual font technology. The format offers , making it invaluable for multilingual PDFs and forms that require user input in diverse languages.

Basic F1 or F2 fonts often suffer from missing "ToUnicode" mapping tables. Without this table, the PDF viewer knows how to draw the letter shape, but it does not know what actual letter it represents. Upgrading to a proper CID font structure (like F4) ensures every character has a direct Unicode assignment. 2. Perfect Text Search and Selection

| Attribute | F1 | F2 | F3 | F4 | |---|---:|---:|---:|---:| | Glyph coverage | Often full set | Subset optimized | Full with hinting | Subset + optimized enc | | File size | Largest | Small | Large | Smallest | | Rendering sharpness | Good | Adequate | Best (hinted) | Good | | Compatibility | High | High | High | High | | Best for | Print, archival PDFs | Web or lightweight PDFs | Screen-readable PDFs, small-text clarity | Low-bandwidth or web use | | Typical use-case | Archival, exact glyphs | Faster downloads | UI text, small sizes | Mobile/embedded PDFs |

There is no "better" font in this list because they are system-generated substitutes. However, you can determine which one you need based on the following:

Standard fonts map directly to standard text encodings. Sometimes, poorly generated CID fonts lack a proper "ToUnicode" map. When this happens, the text looks perfectly fine on screen, but if you try to copy-paste the text or search for a keyword, it will paste as gibberish. 4. Editing and Post-Processing Winner: Standard Fonts

| Issue | Solution | |-------|----------| | F1 appears in PDF text | Missing embedded font → re-export PDF with embedding | | F1 in print output | Install original font or map F1 to a readable font | | F1/F2/F3/F4 in Ghostscript | Create custom Fontmap.GS with (F1) /NotoSansCJK-Regular | | Want to avoid substitution | Convert all text to outlines (last resort) |