Cid Font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download |best| -

doc = fitz.open("input.pdf")

Before searching for a download, check what the font was supposed to be: Impossible fonts to be found / Fontes impossíveis de achar CID font F1 F2 F3 F4 F5 F6 F7 Fonts Free Download

doc.save("output_fixed.pdf")

Open your PDF in → Go to File > Properties > Fonts tab. Look for entries like CIDFont+F1 , CIDFont+F2 , etc. The "Actual Font" column will show the true name (e.g., "Ryumin-Light"). doc = fitz