A PDF can become damaged when a download is interrupted, an email gateway mangles an attachment, or a program crashes while saving. The symptoms vary: the file refuses to open, some pages are blank, or your viewer warns that the document is damaged. Often the page content is still there and only the internal index (the cross-reference table) or a few objects are broken.
Repair PDF rebuilds that structure using qpdf and PyMuPDF and writes a clean new file containing everything that could be recovered. Your file is uploaded securely over HTTPS, processed on our servers and deleted automatically within an hour.
Be realistic about the outcome: if parts of the file are truly missing, for example a download that stopped halfway, those pages cannot be brought back. If you can, try downloading or exporting the original again first.
How to Repair PDF
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1
Upload the damaged PDF
Select the file that won't open or shows errors.
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2
Repair
We rebuild the file structure and recover readable objects.
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3
Check the result
Open the repaired file and review the pages.
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4
Download
Save the repaired PDF; the server copy is deleted automatically.
Features
Cross-reference rebuild
Reconstructs the PDF's internal index, the most common cause of 'file is damaged' errors.
Two repair engines
qpdf and PyMuPDF approach broken files differently, which improves the chance of recovering content.
Clean output
The result is written as a fresh, standards-conforming PDF that most viewers can open.
Good to know
- Not every file is recoverable. Data that is missing or overwritten cannot be restored.
- Fonts or images that were damaged may display incorrectly or be missing in the repaired file.
- Maximum 100 MB and 500 pages per file.
Frequently asked questions
Can every corrupted PDF be repaired?
No. Repair works well when the file structure is broken but the content is intact. If the file is truncated or its data has been overwritten, the missing parts cannot be recovered.
My PDF opens but some pages are blank. Can this help?
Sometimes. If the page content exists but isn't referenced correctly, rebuilding the structure can bring it back. If the content itself is missing, it can't.
Can you repair a password-protected PDF?
The file must be readable. If you know the password, remove it with Unlock PDF first; if the encryption data itself is damaged, repair may not succeed.
Is my file kept after repair?
No. It is processed in an isolated worker and deleted automatically within 60 minutes. You can also delete it immediately after downloading.