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Compress PDF

Repair PDF

Repair a damaged or malformed PDF by rebuilding its internal structures. Your files never leave your device.

Private by design
Your files never leave your device. All processing happens locally in your browser — no uploads, no servers.

Drop your PDF here

or click to choose a file

Your files never leave your device.

Rebuilds the PDF's internal structures to fix a damaged or malformed file. Useful when a PDF fails to open in some viewers.

Repair PDF rebuilds the internal structures of a damaged or malformed PDF to produce a valid document. It fixes broken cross-reference tables, truncated files, and other structural issues that prevent a PDF from opening in some viewers. Repair runs entirely in your browser via qpdf-wasm — your file never leaves your device.

How it works

How to use Repair PDF

  1. 1
    Drop your PDF. Drag and drop a damaged PDF file onto the drop zone, or click to choose a file from your device.
  2. 2
    Click Run Repair PDF. The tool rebuilds the PDF's cross-reference table and internal structures locally in a Web Worker using qpdf-wasm. Your file never leaves your device.
  3. 3
    Download the repaired PDF. The re-serialized valid PDF is offered as a download. Try opening it in your viewer to confirm the repair.

Features

What this tool does

  • Rebuilds broken cross-reference tables
  • Fixes truncated and malformed PDF structures
  • Re-serializes the PDF into a valid document
  • No upload — runs entirely in your browser

Limitations

Things to know

  • Cannot recover content that is missing from the original file
  • Cannot repair password-encrypted PDFs without the password
  • Some severely damaged PDFs may not be repairable

FAQ

Frequently asked questions

Is my file uploaded anywhere?

No. Repair happens entirely in your browser using a Web Worker and qpdf-wasm. Your file never leaves your device.

What kinds of damage can this fix?

Repair fixes structural issues: broken cross-reference tables, malformed headers, truncated files, and other problems that prevent a PDF from opening. It cannot recover content that is missing from the original file.

Can it repair an encrypted PDF?

Not without the password. If the PDF is password-encrypted, use Unlock PDF first to decrypt it, then repair the decrypted copy if needed.

Will the repaired PDF look the same?

The visual content (pages, text, images) is preserved. The repair only fixes internal structures — the output should render identically to the original when the original was valid.