Repair PDF
Rebuild a damaged PDF structure when recovery is possible. Accepts Damaged or readable PDF up to 20 MB. Produces repaired PDF and recovery report. Processing happens locally in your browser.
Input: Damaged or readable PDF up to 20 MB · Output: repaired PDF and recovery report
Quality boundary
The local qpdf engine rebuilds the document structure and reopens the result. Missing page content or severely damaged objects cannot always be recovered.
How this file is processed
The file stays on this device during processing. Review the result before consequential use.
Troubleshoot a PDF that will not open
Useful next actions
Diagnose a PDF that will not open before rebuilding it.
A failed open can come from an incomplete download, a wrong file extension, password protection, a viewer-specific limitation, or damaged PDF structure. Repair is appropriate only after the simpler causes are ruled out.
Use a short failure matrix
First confirm the file has a PDF signature and a non-zero size, download it again, and try a second current viewer. A password prompt is not corruption, and a browser preview failure does not prove the file itself is damaged. Keep the original bytes for comparison.
Repair structure, then verify content
The local qpdf workflow rebuilds recoverable document structure and reopens the result. It cannot recreate missing pages or content that was never downloaded. Compare page count, visible content, text search, forms, attachments, and signatures with the source before replacing any working copy.
Quick quality check
- Keep the original file
- Download the source again
- Try a second viewer
- Distinguish passwords from damage
- Verify every repaired page