If you created the document using software like AutoCAD, InDesign, or Microsoft Word, the export settings are likely the culprit. Open the original source document. Go to the or Save As menu and select PDF. Open the PDF Options or Advanced Settings menu.
Since you cannot install the "font" itself, the solution is to fix the PDF file or substitute the missing fonts with fonts you actually possess. Method 1: The "Save As/Export" Fix (Most Effective)
Go to and check Convert All Text to Outlines . This turns the text into shapes so you don't need the font at all.
Run with sudo bash fix-cidfonts.sh .
cidfont f1 f2 f3 f4 f5 f6 install looks like a weird tech spell, but it’s really just a request to install standard Japanese/Mincho/Gothic CID-keyed fonts. The fix is usually:
cannot be found, you aren't alone. This issue typically arises when a PDF was exported from software that failed to properly embed the original fonts.
Open the problematic PDF in Preview (macOS) or another PDF editor. Select or Print > Save as PDF . cidfont f1 f2 f3 f4 f5 f6 install
in your export settings to prevent others from seeing this error. for a specific project? How to fix font issue to make PDF file show properly?
The new file will often have the fonts re-encoded or flattened, making them viewable without errors. 3. Flatten for Editing (Illustrator)
I can provide specialized command-line tools or alternative software recommendations based on your setup. Share public link If you created the document using software like
: You can check what the missing fonts were supposed to be by going to File > Properties > Fonts in Adobe Acrobat. If the original names are listed next to the "F1" alias, you can install those specific fonts (e.g., Arial Bold) on your system.
If your PDF reader relies on your operating system's font library to substitute missing CIDFonts, you need to ensure Windows or macOS has the proper language files installed. On Windows 10 & Windows 11 Press Windows Key + I to open .
fc-cache -fv echo "CIDFont mapping for F1-F6 installed." Open the PDF Options or Advanced Settings menu