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"CIDFont+F1," "F2," "F3," and so on are not actual font names that you can download; they are temporary placeholders
For 95% of users, installing and Noto Sans CJK JP will instantly resolve F1 through F6 errors. For F7, inspect your PDF’s properties and pick a matching open-source font. CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download
Go to > Preferences (Windows) or Acrobat > Preferences (Mac). Select the Page Display category. Check the box for Use local fonts . "CIDFont+F1," "F2," "F3," and so on are not
If you are using Adobe Illustrator , you can "Flatten Transparency" and check the option. This converts the text into shapes, removing the need for the font file entirely. Print to PDF (Again) Select the Page Display category
: Since these aren't real font files, downloads from unofficial sources may just be bundled unwanted software. How to Fix the Issue
They point to a subset of an actual font (like Arial, MS Gothic, or Helvetica) used in the original document. Why Is Your PDF Showing a CID Font Error?