Ghostscript includes free replacements for missing CIDFonts using the or Noto Fonts (Google’s free CJK fonts). How to install (gratis): On Ubuntu/Debian:
These names are not actual font families like Arial or Times New Roman. Instead, they are used by PostScript and PDF renderers. When these CIDFonts go missing, text can become garbled, boxes appear instead of letters, or the file refuses to print. cidfont f1 f2 f3 f4 gratis
/CIDFont+F1 /NotoSansCJK-Regular ; /CIDFont+F2 /NotoSerifCJK-Regular ; This effectively gives you across any platform. Method 3: Free Microsoft Fonts That Replace F1–F4 If you are on Windows, you might already have the fonts that your PDF is looking for. Microsoft distributes several free (as in included with Windows) Asian fonts that act as drop-in replacements. text can become garbled