Re-export the file. This ensures every recipient has the font data built right into the file. To help find the right solution, let me know: What (Windows, Mac) are you using? What software opens the broken PDF? Was the PDF created by you or sent by someone else?
When a PDF is created, the software sometimes fails to embed the full font file. To keep the file readable, it creates a "CID" (Character Identifier) font. Cid Font F1 F2 F3 Free Download
Converting the PDF to a different format (like a Word document or a series of JPEG images) often forces an online engine to reconstruct the unembedded font data using standard system fonts. Re-export the file
If you know the person who created the document, the best solution is to ask for a corrected copy. Instruct them to export the PDF with the option checked in their software settings (such as Adobe InDesign, Illustrator, or Microsoft Word). To help me provide the best fix, tell me: What software are you using to open the file? What language or type of text is showing up broken? Are you trying to view, print, or edit the document? Share public link What software opens the broken PDF
Are you , or are you receiving an exact error message ? Is the issue happening with a specific PDF or all of them?