A PDF that will not open is usually not lost. Most 'damaged file' errors come from a truncated download, an interrupted save, a cross-reference table that points to the wrong byte offsets, or a generator that produced slightly non-standard structure that strict viewers refuse to parse.
Repair PDF rebuilds the document's internal structure. It rescans the file for object definitions, reconstructs the cross-reference table from what it finds, discards unrecoverable fragments, and writes a clean, standards-conformant file that ordinary readers will open.
How to use Repair PDF
- 1Upload the PDF that is refusing to open or displaying errors.
- 2Press Repair — the tool scans and rebuilds the object tree.
- 3Review the report showing how many pages and objects were recovered.
- 4Download the repaired file and confirm it opens as expected.
What can and cannot be recovered
If the bytes of a page's content stream survive somewhere in the file, that page can almost always be brought back. If the file was truncated mid-download, everything after the cut-off point is genuinely gone — repair will recover the pages that made it and drop the rest rather than fail entirely.
Before you repair, try re-downloading
The single most common cause of a broken PDF is an incomplete download. If you can, fetch the file again from its source first. Repair is for files where the original is already damaged or no longer available.
Supported formats, limits and things to know
- Truncated files can only be recovered up to the point of truncation.
- Repairing invalidates any digital signature, because the file is rewritten.
- Encrypted damaged files usually cannot be repaired without the password.
Repair PDF — frequently asked questions
Why does my PDF say it is damaged or corrupted?
Most often the download was interrupted, or the file's cross-reference table — the index that tells readers where each object lives — is wrong. Both are usually repairable.
Will repair recover all my pages?
It recovers every page whose content survives in the file. A report after processing tells you exactly how many were found.
Does repairing change how the document looks?
No. The structure is rebuilt but the page content is preserved as found, so the visual result is identical to what was recoverable.
Can I repair a password-protected PDF?
Generally not, because the damage prevents the decryption structures from being read. Try unlocking it first if you have the password.
Is there any risk to my original?
None. Repair writes a new file and never modifies the file you uploaded.