Repair PDF Online Free - Fix Corrupted or Damaged PDF Files

Fix corrupted, damaged, or unreadable PDF files online for free. Rebuilds broken PDF structure and recovers all readable pages. No signup required.

Repair corrupted or damaged PDF files that won't open correctly. The tool rebuilds the PDF structure and recovers all readable pages into a clean, valid document.

Upload your PDF to get started — no sign-up required.

How to Repair a Corrupted PDF

  1. Upload your damaged or corrupted PDF file.
  2. The tool automatically attempts to parse and recover the file contents.
  3. All recoverable pages are copied into a new, structurally valid PDF document.
  4. Download the repaired PDF and open it in any PDF reader.

Why Use PDFCrush?

  • Recovers PDFs with broken cross-reference tables and corrupted metadata
  • Uses lenient parsing to extract as much content as possible from damaged files
  • Rebuilds into a clean PDF without carrying over structural errors
  • Entirely browser-based - no file is ever sent to any server

Your Privacy & Security

PDF repair runs locally using pdf-lib's lenient parse mode. Your file never leaves your device.

Frequently Asked Questions

Can this recovery tool salvage formatting on files that fail to open completely?

Yes. The recovery routine reviews raw file binaries to systematically reconstruct broken cross reference tables xref) and corrupted root object dictionaries, restoring readable document content structures where possible.

Are there certain types of file corruption that cannot be recovered?

Yes. If a storage device failure or incomplete download zero fills your data stream 00 bytes , those missing binary segments cannot be recovered. The engine can only rebuild damaged data pathways that are physically present.

Will fixing a damaged PDF restore digital signatures that were broken?

No. Cryptographic digital signatures rely on file hash integrity. Because repairing a damaged file requires rewriting broken structural tables, the historical validation hash changes, rendering the original digital signature void.

Is my corrupted file analyzed or logged on an external diagnostic database?

No. The diagnostic pass and binary reconstruction run entirely within your browser tab session. Your document data is never transmitted to an external server or logged for system diagnostics.

How does the repair engine handle broken cross reference tables?

The script runs an array analysis across the file data, tracking down object identifier keys manually to generate a fresh cross-reference table.

Can I repair a multi page document that displays blank pages?

Yes. If page streams are intact but structurally detached due to missing reference objects, the repair builder maps them back to the primary view tree.

Does running a binary rebuild modify the original damaged file on my computer?

No. The original file remains untouched. The tool creates a fresh document file containing the recovered data for download.

Can this tool fix file structures that were damaged by interrupted email downloads?

Yes. If the end parameters are missing, the repair script appends clean structural terminations to make the file readable in PDF viewers.