Repair PDF

A PDF that refuses to open is stressful, especially when it is the only copy of an invoice, a certificate, or a signed contract. PDFora's repair tool re-parses the damaged file, salvages the objects it can still read, and rebuilds the PDF's internal structure into a fresh, standards-compliant document. For the most common kinds of corruption, that is enough to bring a dead file back.

Corruption usually comes from an interrupted download, an email attachment that got truncated, a crashed export, or a file transferred between systems that mangled its bytes. The symptoms range from an outright error message to subtler oddities, like blank pages, missing images, or a reader that freezes on page three. Repair addresses these by discarding the broken scaffolding and writing a clean one.

The whole process runs in your browser. Your broken file is never uploaded, which means a corrupted tax document or medical report stays private while it is being fixed. The tool is free, requires no account, adds no watermark, and you can attempt as many repairs as you need. It is currently in beta, and we say so plainly.

How to repair a corrupted PDF online

1. Open the Repair PDF tool on PDFora in any up-to-date browser.
2. Select the damaged PDF from your device, or drag it onto the drop area.
3. Click Repair to start. The tool re-parses the file locally and rebuilds its internal structure.
4. Wait while recoverable pages, text, and images are collected into a new document.
5. Download the repaired PDF and open it in your usual reader to confirm the fix.
6. Page through the whole document, since some content may be recoverable while other parts were truly lost.

When to use this tool

• Recovering an invoice that downloaded halfway before your connection dropped and now shows a 'file is damaged' error.
• Fixing a PDF email attachment that opens on the sender's machine but errors out on yours.
• Rescuing an old scanned certificate from a backup drive that developed read errors.
• Repairing a report that a buggy export-to-PDF feature wrote with a broken cross-reference table.
• Getting a PDF to open in a strict reader, like a print shop's software, after it worked only in a forgiving browser viewer.
• Rebuilding a file that displays blank pages or garbled images even though it technically opens.

Tips for the best results

• Try re-downloading first. If the original source still exists, a fresh download is more reliable than any repair, since repair can only work with the bytes that survived.
• Never overwrite the broken file. Save the repaired version under a new name so you can attempt other recovery routes if needed.
• If the repaired file opens but looks incomplete, the missing parts were likely destroyed rather than just misreferenced. Repair rebuilds structure; it cannot invent lost data.
• A PDF that asks for a password is locked, not corrupted. Repair cannot process encrypted files, so unlock the document first if you have the password.
• Check the page count after repair. Comparing it against what you expected is the fastest way to spot whether pages were lost to the corruption.