Are my files uploaded to a server?

No. Every tool on this site runs inside your browser. Your file is read from your disk into your own browser's memory, processed there, and written back out. You can confirm this yourself: open your browser's developer tools, switch to the Network tab, and run the tool — you will not see your document being sent anywhere. It also means the tools keep working if you go offline after the page has loaded.

Can it recover a file that was truncated?

Often, yes — partly. If the download stopped at 80%, the objects in that 80% are usually still readable and can be rebuilt into a working document with the later pages missing. Nothing can recover bytes that never arrived.

What if repair does not work?

Then the damage is in the page content itself rather than the index, and no tool can invent what is not there. If you still have the original source, re-exporting it is the only real fix.

BunkerPDF

Repair a damaged PDF

Reconstructs a PDF's internal structure from whatever is still intact. Fixes the broken cross-reference tables and truncated files that stop a document opening.

Runs in your browser — this file is never uploaded

Select a damaged PDF

or drop a file here

Files that will not open, show errors, or came from an interrupted download.

How to repair a damaged PDF

1Select the damaged PDFAny file that will not open, throws an error, or shows blank pages is worth trying.
2Let it rebuildThe file's internal index is reconstructed from the objects still present in it. This takes a second or two.
3Check the resultYou are told how many pages were recovered before you download, so you know whether it worked.

When you would use this

PDFs break in predictable ways: a download that stopped halfway, a file copied off a failing drive or a full USB stick, or a document written by software that produced a slightly malformed file to begin with. In many of those cases the pages are all still there and only the index that points at them is broken, which is exactly what this rebuilds.

Questions about Repair PDF

Are my files uploaded to a server?: No. Every tool on this site runs inside your browser. Your file is read from your disk into your own browser's memory, processed there, and written back out. You can confirm this yourself: open your browser's developer tools, switch to the Network tab, and run the tool — you will not see your document being sent anywhere. It also means the tools keep working if you go offline after the page has loaded.
Can it recover a file that was truncated?: Often, yes — partly. If the download stopped at 80%, the objects in that 80% are usually still readable and can be rebuilt into a working document with the later pages missing. Nothing can recover bytes that never arrived.
What if repair does not work?: Then the damage is in the page content itself rather than the index, and no tool can invent what is not there. If you still have the original source, re-exporting it is the only real fix.

Other tools you might need

Compress PDFShrink file size for email and uploads, with control over the quality trade-off.Merge PDFCombine several PDFs into one, in exactly the order you choose.Split PDFPull out single pages, custom ranges, or break a file into separate documents.Organize PDFReorder, rotate and delete pages on a visual board.