This font, included with Android SDK, contains CID mappings for all CJK characters. It is legal to download via developer resources.
pdfcpu fonts extract document.pdf
Use this checklist to resolve the missing "CID font F1" error for good.
1. Using pdffonts (part of Poppler – free) cid font f1 f2 f3 f4 f5 f6 f7 fonts free download work
pdffonts document.pdf
Output:
name type encoding emb sub uni object ID
------------------------- ------------ ---------- --- --- --- ---------
AAAAAA+NotoSansCJK-Regular CID Type 2 Identity-H yes yes yes 4 0
F2 CID Type 2 Identity-H yes yes yes 5 0
The name column shows the real font (AAAAAA+NotoSansCJK-Regular). The prefix AAAAAA+ indicates a subset. Remove the prefix to find the base font: NotoSansCJK-Regular.
2. Using mutool info (from MuPDF – free) This font, included with Android SDK, contains CID
mutool info document.pdf | grep -i font
Once you have the real font name (e.g., NotoSansCJK-Regular, SourceHanSans, KozMinPro, MS-Mincho), download from:
| Font Family | Free Source | |-------------|--------------| | Noto CJK (Google) | https://fonts.google.com/noto | | Source Han Sans (Adobe) | https://github.com/adobe-fonts | | Source Han Serif | same as above | | IPA fonts (Japanese) | https://mojikiban.ipa.go.jp | | Unifont (CJK fallback) | https://unifoundry.com/unifont |
Installation (Windows): Copy to C:\Windows\Fonts\
Linux: ~/.local/share/fonts/ then fc-cache -fv pdfcpu fonts extract document
If you’ve encountered errors like "Cannot find or create the font 'F1'" in Adobe Acrobat, Illustrator, or a CNC engraving software, you are likely dealing with CID-keyed fonts. These are not standard decorative fonts but rather internal font mappings used by PostScript printers and PDFs.
Below is a breakdown of what F1 through F7 refer to, how they work, and where to get functional free equivalents.