PDF Repair Tool

Attempts to fix some structural issues by re-reading the file leniently and rebuilding it cleanly. Not every file can be recovered.

With PDF Repair, you just pick your file and download the result in seconds — no extra software needed. PDF Repair speeds up a step that often comes up right before sharing a PDF or moving it into another system. The whole process happens locally in your browser; nothing is sent to a server.

Step-by-step

Pick the file that won't open, or throws an error, in the Corrupted PDF File field. Keep a separate copy of the original.
Click Try to Repair. The tool reads the file leniently and tries to rebuild it.
If it succeeds, open the new file and page through all of it. Look for missing pages, blank areas or broken images.
If the result still won't open, the file is probably too damaged for this method. Your best option then is to find another copy.

When is it useful?

PDFs break in ordinary ways: an interrupted download, a mangled email attachment, a USB stick pulled out mid-copy, or software that writes slightly malformed files. When one reader opens a file but another refuses, that usually points to a small inconsistency in the internal structure. Rewriting the file cleanly often fixes that kind of problem.

Example

A student's laptop shuts down while saving their thesis as a PDF, and now the file won't open. They run it through the repair tool and the rebuilt copy opens. Before relaxing, they check the page count and the final chapters, because if the save was cut off, the end of the file may simply not exist. Any missing part is best re-exported from the original document.

The limits of PDF repair

A damaged PDF may not open because of a half-finished download or a faulty structure. Repair re-reads the file structure and writes a new PDF to bring back the pages that can be recovered. For heavily damaged files or downloads with missing content, not everything may be recoverable.

Before and after repair

First try downloading again or opening with another PDF reader.
Compare the page count and content of the repaired file with what you expect.
Password-protected files need the password first.
For important documents, asking the original source for a new copy is the safest route.

Things to keep in mind

Repair can't restore data that was never written. Pages missing from a half-finished download stay missing.
Rebuilding can drop form fields, bookmarks or digital signatures. Don't expect a signature to remain valid on a repaired copy.
If you still have the source file (Word, Excel and so on), exporting a fresh PDF gives a cleaner result than any repair.
When a file got corrupted during download, simply downloading it again often solves the problem.