Repair Corrupt PDF Online Free - Fix Damaged PDF Files
Free online PDF repair tool. Rebuild damaged or corrupted PDF files right in your browser — no upload, no signup.
Tool Interface
Drag & drop your corrupted PDF here
or
PDF files only. Everything runs in your browser — your files are never uploaded.
Repair results
What this tool does
This free PDF repair tool attempts to rebuild a damaged PDF file directly in your browser. It reads the file's structure, discards the broken parts (such as a damaged cross-reference table or a bad incremental update), and writes out a clean, freshly built PDF you can open again.
What it can fix
- PDFs that will not open or show a "file is damaged" error
- Broken cross-reference tables from interrupted saves
- Files damaged during download or email transfer
- PDFs that open in one reader but not another
What it cannot fix
- Files with large sections of missing data (nothing to recover from)
- Password-protected PDFs — remove the password first, then try again
- Files that are not actually PDFs renamed with a .pdf extension
Steps
- Drop your PDF into the upload box or click "Choose PDF File(s)".
- Pick Standard mode, or Aggressive mode for badly damaged files.
- Click "Repair PDF" and wait for the rebuild to finish.
- Download the repaired file and open it to check the result.
Still not working?
Try Aggressive mode. If the file was downloaded, download it again — the transfer may have been interrupted. And always keep a backup of important documents in a second location.
Rate this tool
About This Tool
Free Online PDF Repair Tool
Repair a corrupt PDF online with the free PDF repair tool from Trencada. If your PDF will not open, shows a file is damaged error, or was broken during download, this tool attempts to rebuild the file structure and recover your document — right in your browser, with no upload and no signup.
What this PDF repair tool can fix
- Corrupted PDF files that refuse to open in your PDF reader
- Broken cross-reference tables caused by interrupted saves
- Damaged PDF files from failed downloads or email transfers
- PDFs that open in one app but show errors in another
How to fix a corrupted PDF
- Upload the damaged PDF using the box above (drag and drop works too).
- Choose Standard mode, or Aggressive mode for badly damaged files.
- Click Repair PDF and let the tool rebuild the file.
- Download the repaired PDF and open it to check the result.
Private by design
Unlike most PDF repair services, your file is never uploaded to a server. The entire repair runs on your device using your browser, so sensitive documents stay private.
Frequently asked questions
Is this PDF repair tool really free? Yes. Repair as many PDF files as you like, with no account and no watermarks.
Will my formatting be preserved? In most successful repairs the layout, text, and images are kept intact, because the tool rebuilds the file container rather than recreating the content. Results depend on how badly the file is damaged.
What if the repair fails? Try Aggressive mode first. If the file came from a download, download it again — the transfer may have been interrupted. Files with large sections of missing data or password protection cannot be repaired by any automatic tool.
Can it repair password-protected PDFs? No. Remove the password with the original password first, then run the repair.