Understanding CIDFont F1: Why You Can’t "Download" It and How to Fix It
Note: Print quality will be slightly lower, but the CIDFont error will disappear because your computer rasterizes the page instead of trying to map fonts.
You are not alone. The CIDFont+F1Normal error is a notorious issue among engineers, architects, graphic designers, and administrative professionals who work with legacy PDFs, plotter files (HPGL), or documents generated by older design software.
Introduction: The Ghost of Printers Past
Your system doesn't have the "base" font (like Arial or Myriad Pro) that the CIDFont was originally based on. How to Fix the CIDFont F1 Issue
For Windows 10 / 11
For batch processing multiple problematic PDFs, use the open-source Ghostscript tool:
Check document properties
: In Adobe Acrobat, go to File > Properties > Fonts . This list may show the actual name of the font that "CIDFont+F1" is trying to represent.
qpdf --decrypt locked.pdf unlocked.pdf
