If you are dealing with a problematic PDF file displaying corrupted CIDFont tags, use the following methods to repair the file. Method 1: The "Print to PDF" Re-encoding Trick
These errors manifest in several ways. In graphic design software like Adobe Illustrator or InDesign, you might see a pop-up warning: "Missing fonts: CIDFont+F1" . In a PDF reader, you might see the following:
So, how do we get from this sophisticated system to the simple placeholder CIDFont+F1 ? cidfont f1 f2 f3 f4 f5 f6
If you urgently need to read or print a document and do not care about editing or highlighting the text, you can bypass the font engine entirely by forcing your computer to treat the PDF as a giant photo. Open the PDF in Acrobat Reader. Click . Click the Advanced button at the top of the print menu. Check the box that says Print As Image . Click OK and print. Solution 3: Re-distill or Convert the PDF Online
The letters "F1," "F2," etc., are assigned by the PDF generator (like Microsoft Print to PDF or Adobe Distiller) to keep track of the different font styles used. If you are dealing with a problematic PDF
Sometimes, a simple conversion can "bake in" the visual appearance of the text and remove the dependency on the font file. This is a great option when you only need to view or print the document and don't need to edit the text.
Run the tool on the document. The software will visually analyze the shapes of the letters and overlay a brand-new, searchable, copyable text layer across the document, bypassing the broken CIDFont tags completely. Method 3: Convert Text to Outlines (For Designers) In a PDF reader, you might see the
You've seen the placeholders, but where do the numbers F1 , F2 , etc., come from? They are part of the PDF's internal syntax.
: Open the file using the native Preview app. Select File > Export as PDF . This forces the operating system to re-render the font tables into standard formats.
(via command line with qpdf or mutool ):