Repair PDF Online
Fix a PDF that will not open or shows errors. We rebuild its structure and keep every page we can read. Your file stays in your browser.
Free to use · Works on any device · Files auto-deleted after processing
Drag and drop here or
File must be a PDF
and size up to 15MB.
How it works?
Upload your file
Drag and drop your damaged .pdf file, or browse from your device.
Repair
The file structure is rebuilt and readable pages are kept.
Download your PDF
Save the repaired file and open it again.
Why choose our Repair PDF tool?
Private
Repair runs in your browser, so the file is not uploaded.
Rebuilds structure
Fixes broken cross-reference tables and trailing data where possible.
Clear result
We show how many pages were recovered.
100% free
No hidden fees, no watermarks, no account needed.
Works everywhere
Windows, Mac, Android, iPhone, or Linux. Any modern browser works.
Why repair a PDF?
Interrupted downloads, failed saves and faulty software can leave a PDF with a damaged structure. Repair re-reads what is still intact and writes a clean new file, which often makes the document open again. Severely damaged files may only be partly recoverable.
Repair a corrupted PDF that will not open
When a PDF fails to open or reports a damaged file, the index that tells a viewer where each page lives is often broken while the pages themselves are fine. The Repair PDF tool rebuilds that index and saves a clean copy.
The tool runs in your browser, so private documents are never uploaded. After repairing, check the page count to see how much was recovered.
Quick tips
- Keep the original file until you have verified the repair.
- Unlock password-protected files first.
- Re-download the file if the damage came from an interrupted download.
How to repair a corrupted PDF and what to expect
Why does my PDF say it is damaged or will not open?
A PDF keeps an index that tells viewers where each page lives. If a download was cut short, a save was interrupted, or the file was copied badly, that index can be wrong or missing, and viewers show errors such as file is damaged or cannot be displayed.
Often the page content is still inside the file. Repair rebuilds the structure around it so the pages can be read again.
How do I fix a corrupted PDF online for free?
Upload the file and click Repair PDF. The tool first tries a rebuild that reconstructs a broken index and tidies the file. If that does not work, it falls back to a more forgiving re-save. You then download the new PDF.
The repair runs in your browser, so the document is not uploaded.
Can every corrupted PDF be recovered?
No. If the page data itself is destroyed or overwritten, there is nothing to rebuild. In that case the tool tells you no readable pages were found. When it works, it reports how many pages it recovered, and any damaged part may be missing from the result.
What else can I try if the repair fails?
Download the file again from where you got it, or look for an earlier version or a backup. Opening it in a different viewer can also help, because some are stricter than others. Check the repaired copy page by page before you rely on it.
Popular ways to use it
Recover an interrupted download
Rebuild a PDF that stopped part-way and now shows an error.
Fix a file that opens in one app but not another
Write a clean copy that stricter viewers accept.
Salvage a scan that will not open
Try to get your pages back from a damaged scan.
Prepare a file for a portal upload
Some upload forms reject files with structural errors. A rebuilt copy may pass.
Check how much of a file survives
See how many pages can be recovered before you ask for a new copy.
Troubleshooting and common problems
It says the PDF is too damaged to recover.
No readable pages were found. Ask for a fresh copy or look for a backup.
The repaired PDF has fewer pages.
Parts of the original could not be read. Compare it with your source if you have one.
The tool says the PDF is password protected.
Unlock it with Unlock PDF first, then repair it.
The file opens but looks garbled.
That can be a font or encoding problem rather than file damage, which repair may not fix.
Good to know
- Recovery is not guaranteed
- It depends on how much of the file is intact.
- You get a new file
- Your original stays as it was.
- Page count is reported
- You can see how many pages were recovered.
- Runs in your browser
- The PDF is not uploaded.
Who uses this tool?
Students
Recover an assignment that stopped opening.
Professionals
Rescue reports from interrupted downloads or saves.
Office teams
Fix files that fail to open in some viewers.
Anyone with old files
Revive archived PDFs that show errors.
Supported formats
| Input | Output |
|---|---|
| .pdf (damaged) | .pdf (repaired) |
FAQs
Can every corrupted PDF be repaired?
No. If the page data itself is destroyed it cannot be recovered. The tool tells you when no readable pages are found.
Is my PDF uploaded?
No. The file is processed in your browser.
Does it work on password-protected PDFs?
Unlock the PDF first, then repair it.
Will the repaired PDF look the same?
Recovered pages keep their content. Parts that were damaged may be missing.
Why does my PDF show errors in some viewers?
Strict viewers reject files with structural problems. Repair writes a clean structure that most viewers accept.
How do I fix a corrupted PDF online?
Upload it, click Repair PDF and download the rebuilt file.
Why does my PDF say it is damaged?
Usually the file structure is incomplete, for example after an interrupted download or failed save.
How do I fix a PDF that will not open?
Try Repair PDF. It rebuilds the file structure and gives you a new copy to open. If it cannot find readable pages, get a fresh copy of the file.
What causes a PDF to become corrupted?
Common causes are interrupted downloads, failed saves, bad transfers and disk problems.
Can I repair a PDF without uploading it?
Yes. The repair runs on your device in your browser.
Will repairing a PDF change its content?
Recovered pages keep their content. Only damaged parts may be missing.
Is the repaired file smaller or larger?
It can differ, because the file is rebuilt and tidied. Use Compress PDF if you need it smaller.