Repair a Damaged PDF Online
Rebuild a PDF that will not open or has a damaged structure.
🔒 Your file is processed inside your browser. It is never uploaded or saved.
What is Repair PDF?
A PDF can refuse to open after an interrupted download, a failed email attachment or a faulty save. This tool reads the file, rebuilds its internal structure and saves a fresh copy. It is a quick first attempt that often works for minor structural problems.
How to repair a PDF
- Add the PDF that gives an error when you open it.
- Press Start. The browser tries to read the file and write it again with a clean structure.
- Download the edited copy and open it in your usual viewer.
- If the tool reports an error, try downloading or exporting the original file again from its source.
When Repair PDF is useful
Broken downloads
Recover a file that stopped half-way through downloading.
Slightly corrupted attachments
Fix files that opened yesterday but now report a structure error.
Preparing for other tools
Re-save a fussy PDF so that merge, split and other tools can read it.
Tips for better results
Repair cannot bring back data that is truly missing. If the file was cut short, pages after the break are gone. Keep the original untouched and work on the repaired copy. If your file is protected with a password, unlock it with Unlock PDF first.
Good to know before you start
PDF files keep an index at the end of the file that tells readers where each page is stored. If a download is cut short or a program crashes while saving, that index can be missing or wrong, and viewers then report that the file is damaged. The repair tool reads whatever it can find, writes a fresh index and saves the result as a new file. It works best when the page content is intact. If the file opens but looks wrong, the problem is likely in the content rather than the structure, and repairing will not help. Try opening the original in a second viewer before you repair it.
Why use PDFToolkit
When you repair a PDF with PDFToolkit, the work stays on your own device. Your contracts, ID scans and invoices are processed in the browser and are never sent to a server.
- Private: no upload, nothing saved.
- Free: no sign-up, no daily limit and no watermark.
- Fast: no waiting for files to travel over the internet.
- Everywhere: Windows, Mac, Linux, Android and iPhone.
Frequently asked questions
Can this tool recover every damaged PDF?
No. It handles structural problems, but missing content cannot be recreated.
Does repairing change what the pages look like?
Normally not. The content is kept and only the file structure is rebuilt.
What if the repaired file still will not open?
Try getting a fresh copy from the sender or the original source.
Is my document uploaded?
No. Repair is done in your browser.