Ensure the option or "Subset fonts when percent of characters used is less than 100%" is checked.
Corrupted .ttf or .otf files that can destabilize your system font cache. The Technical Solution
If you are opening a PDF in Adobe Acrobat or Reader and seeing an error like:
Instead of hunting for a non-existent font file, you must fix how your computer or PDF reader interprets the missing data. How to Fix CIDFont-F1 Error and Missing Text cidfont f1normal font free download 2021
Since CIDFont F1 usually defaults to a standard serif or sans-serif font, you can often trick your PDF reader into displaying the text correctly by substituting a common, installed font.
Open your original document program (Microsoft Word, InDesign, etc.). Go to > Save As or Export . Choose PDF as the format. Open the Options or Advanced Settings menu.
Instead, import or place the PDF file as an image layer in a blank document. Ensure the option or "Subset fonts when percent
Upload your file and select "Repair" to attempt to fix the font mapping. Summary of Solutions
The Ultimate Guide to CIDFont+F1Normal: How to Fix, Download, and Manage This Elusive Font
: On macOS, opening the file in Preview and then re-exporting it as a PDF can sometimes fix encoding issues. How to Fix CIDFont-F1 Error and Missing Text
Disclaimer: This information is based on common PDF font issues encountered up to 2026. It is not affiliated with the "Formula 1" trademark, which uses different font licensing.
This can often substitute missing CIDFonts automatically.