Free Online PDF Tool
Repair a Corrupted PDF
Recover a PDF that won't open, shows errors, or displays incorrectly by rebuilding its internal structure.
Open Repair PDF →Free sign-in · Up to 20MB per file, unlimited on Pro
How to Use Repair PDF
- Upload the damaged PDF file.
- Click Repair and let LONX DOC attempt to rebuild the file.
- Download the repaired PDF.
Frequently Asked Questions
Can every corrupted PDF be repaired?
Most structural corruption (bad headers, broken cross-reference tables) can be fixed, but a file with badly damaged content streams may not be fully recoverable.
Is my file uploaded to a server?
No. This tool runs entirely in your browser — your file is never uploaded anywhere, so nothing ever leaves your device.