What to do right now
- Download or copy the PDF again if you still can; compare the file sizes.
- Try a second viewer, such as a web browser, to rule out a viewer problem.
- Inspect the file and rebuild its structure into a new copy.
Step by step
Rule out an incomplete download
Compare the file size with the original or download it again. Email attachments and browser downloads that were interrupted are a common cause.
Open it in another viewer
Open the file in a web browser or another PDF reader. If it opens there, the file may be fine and the problem lies with the first viewer or its settings.
Check for a password
Encrypted PDFs need their password. Without it they cannot be opened, and a damaged encrypted PDF cannot be repaired by structural tools.
Inspect and repair a copy
In Damaged file repair, choose the PDF. FileFix Ultimate checks the header, the cross-reference table, object streams and the end of the file, then offers to create a repaired copy.
Check every page
Open the repaired copy and scroll through all pages. Pages whose content streams were lost can appear blank; that data was not in the file.
Why PDFs break
A PDF is a collection of numbered objects, such as pages, fonts and images, plus a cross-reference table at the end that says where each object starts. If the end of the file is missing or the table points to the wrong places, viewers cannot find the pages and declare the file damaged, even if almost all the content is there.
Repair scans the file for the objects themselves and builds a new, correct table. When the objects are intact, the document comes back complete. When some objects were cut off or overwritten, the pages that depend on them stay incomplete.
Incremental saves add new objects and a new table at the end each time a PDF is edited. If the last save was interrupted, an older, complete table may still exist further up in the file.
Recovered PDFs
PDFs recovered after deletion may be truncated if part of the file was overwritten. FileFix Ultimate checks the structure of every recovered PDF and labels it as validated, partial or not validated.
When it won't work
- Password-protected or encrypted PDFs are not repaired.
- Missing page content, images or fonts cannot be recreated; affected pages stay blank or incomplete.
- Scanned PDFs whose image data is damaged lose those pages.
How FileFix Ultimate helps
- Rebuilds the cross-reference table from the objects it finds, including objects inside compressed object streams.
- Writes a new file and leaves the original as it was.
- Reports what was changed, so you can judge the result.
- Validates recovered PDFs independently of the code that found them.
FileFix Ultimate is free, works offline and never writes to the drive you are recovering from. Check the signature before you run it.
Frequently asked questions
Why does Adobe say the file is damaged but my browser opens it?
Viewers differ in how strictly they treat small structural errors. A repaired copy with a correct structure usually opens in all of them.
Can I recover the text from a damaged PDF?
If the page objects survived, yes; the repaired copy contains them. If they are missing, there is nothing to extract.
Is it safe to open a PDF from an unknown source after repair?
Repair does not remove malicious content. Treat it like the original: open untrusted PDFs only in an up-to-date viewer.
Why is the repaired PDF smaller than the original?
Damaged or duplicate data that no object refers to is left out. If all pages display correctly, nothing you need is missing.