Repair PDF Online — Fix Corrupted Files Free
Got a PDF that won't open with a “damaged file” error? This tool rebuilds its internal structure and gives you a fresh, working download. Honest note: it can't recover data that was never there.
Drag & drop your PDF here
or click to browse — files stay on your device
Files never leave your deviceHow to repair a corrupted PDF
- Drop the damaged PDF into the box above (you can add several at once).
- Click Repair PDF — the file's structure is rebuilt page by page.
- Download each repaired file and check it opens in your reader.
About this free repair pdf tool
PDFs break more often than you'd think: an interrupted download, a failing USB stick, or a buggy exporter can leave the file's internal cross-reference tables scrambled even though the actual pages are fine. Readers then refuse to open it with a “file is damaged” message. This tool parses the file with a strict PDF engine and writes it back out cleanly, reconstructing the navigation structures from scratch — which is enough to rescue a surprising number of “corrupt” files.
The honest limits: repair works on structure, not content. If the file is truncated and pages are genuinely missing, no tool can invent them — re-download the original if you can. Password-protected or encrypted PDFs can't be parsed at all, so they must be unlocked first. And as with every PDFPax tool, your file never leaves your browser: the repair happens entirely on your device, and the fixed file is generated locally.
Frequently asked questions
What does repairing actually do?
The tool re-reads your PDF with a strict parser and writes it back out from scratch, rebuilding the cross-reference tables and object streams that readers use to navigate the file. If the visible content is intact but the internal bookkeeping is broken, the rebuilt file usually opens fine again.
Will it fix a password-protected PDF?
No. Encrypted files cannot be parsed without the password, so repair will fail on them. Remove the password first (if you know it), then run the repair.
What if my file still won't open?
Then the damage is in the content itself — for example the download was cut off and pages are missing. No tool can recreate data that was never received; try downloading the original file again.