Guides ·
How to use Repair PDF
Repair PDF. Fix damaged or unreadable PDF files. No. If the file was truncated during download, the missing part is gone.
The short answer
To repair a PDF, choose the damaged file and click Repair. ClickZM rebuilds the cross-reference table and object structure; if that fails it re-renders every readable page into a fresh PDF, so you recover as much as possible.
It runs in your browser. What you enter is not uploaded.
How to use it
Choose your file with the upload box above, or drag and drop it onto the box.
Adjust the options; the preview updates as you change them.
Click the main button to process the file in your browser.
Download the result. Your original file is never changed or uploaded.
Limits worth knowing
Can every broken PDF be fixed? No. If the file was truncated during download, the missing part is gone. Repair recovers whatever pages are still readable.
Why use rebuild mode? Rebuild mode draws each page as an image with PDF.js, which tolerates many errors that stop other programs, at the cost of selectable text.