Repair PDF
Attempt to fix a damaged or corrupted PDF so it opens normally again.
Attempt to fix a PDF that won't open properly, has broken formatting, or throws errors — processed locally in your browser.
Attempt to fix a damaged or corrupted PDF so it opens normally again.
A “corrupted” PDF usually isn't unreadable in every sense — more often, its internal structure (the cross-reference table that tells a PDF reader where each object lives inside the file) has become damaged or incomplete, often from an interrupted download, a buggy export, or an incompatible editing tool. This repair tool loads the file with relaxed parsing rules using the pdf-lib library — ignoring encryption issues and tolerating invalid objects rather than stopping at the first error — then rebuilds and re-saves the document with a clean, valid structure.
This approach fixes a meaningful share of “won't open” or “shows an error” PDFs, particularly ones with minor structural damage. It can't recover a file that's fundamentally missing data (for example, if the download was cut off partway through and large chunks of the content are simply gone), and it can't fix a PDF that isn't actually a PDF at all. In those cases, the tool will let you know the file is too damaged to repair automatically.
Select the problematic PDF and click Repair & Download. If the repair succeeds, a clean version of your file downloads immediately, ready to open normally in any PDF reader.
No installs, no accounts, and no waiting on server queues. Everything happens locally on your device.
Choose the PDF file that won't open or shows an error.
pdf-lib reloads the file with relaxed parsing and rebuilds its internal structure in your browser.
If repair succeeds, a clean, valid PDF downloads instantly.
It's most effective on PDFs with a damaged internal cross-reference table or minor structural inconsistencies — common causes of a PDF that won't open, shows a parsing error, or displays incorrectly in some readers. It works by reloading the file with relaxed parsing rules and re-saving it with a clean structure.
If large portions of the file's actual data are missing or the file isn't a valid PDF to begin with (for example, a renamed file of a different type, or a download that was cut off partway through), there's no internal structure left to rebuild, and the repair will fail.
The tool ignores encryption errors while loading in order to attempt a repair, but this is meant for recovering the document structure, not for bypassing password protection you don't have the credentials for. Only use this on files you have the right to access.
No. The relaxed loading and re-saving both happen locally in your browser using the pdf-lib library — your file, damaged or not, is never sent anywhere during the repair attempt.
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