Repair PDF Online Free — Fix Corrupted PDF Files
Repair a damaged PDF by re-serializing its internal structure. Fixes broken cross-reference tables, incomplete incremental saves, and minor object errors. All processing stays in your browser.
Repaired PDF ready
New size: -
Result
How to Repair a Corrupted PDF Online
Fix minor PDF structural issues — broken cross-reference tables, incomplete saves, minor object errors — by re-serializing the file through pdf-lib. Fast, free, and fully browser-based.
- Upload your damaged PDF — drag and drop the file that won't open properly.
- Click "Repair PDF" — the tool reloads and re-saves the PDF, rebuilding the internal structure.
- Download the repaired file — open it normally in any PDF reader.
What Gets Fixed
- Broken cross-reference (xref) tables — the internal index that tells readers where objects are located.
- Incomplete incremental saves — PDFs that were closed mid-save or crashed during editing.
- Minor object corruption — objects with inconsistent length fields or missing end markers.
- Trailer dictionary issues — problems with the PDF's root object reference.
What This Tool Cannot Fix
This is a lightweight structural repair — not a full data recovery tool. It cannot fix: heavily truncated files (missing pages), encrypted files without the password, corrupted image or font data within intact objects, or PDFs with completely missing headers.
Privacy & Security
Your PDF never leaves your device. The entire repair process happens locally in your browser.
FAQ
Will my PDF be uploaded?
No. The entire repair happens in your browser using pdf-lib. Your file never leaves your device.
What kinds of corruption can this fix?
Broken cross-reference tables, incomplete incremental saves, minor object errors, and trailer dictionary issues. It rebuilds the PDF structure.
Can it recover deleted pages?
No. This tool re-serializes whatever content is still readable in your PDF. It cannot recover data that has been physically deleted or overwritten.
Does it work on encrypted PDFs?
If the PDF is encrypted with a user password, the repair will likely fail. If it's only owner-protected (no open password), the tool can read it.
Will the file size change?
Typically the repaired file is similar in size to the original. Slight differences are normal due to re-serialization.
Is this the same as Adobe Acrobat's repair?
This is a simpler browser-based repair. Acrobat has deeper recovery capabilities. Use this tool for quick fixes — if it doesn't work, try a desktop tool.
What if the repair doesn't work?
If pdf-lib cannot parse the file at all, the tool will show an error. In that case the PDF is likely too damaged for automated repair and requires specialized forensic tools.
Does this work on mobile?
Yes. Processing happens on your device.