Repair PDF
Fix corrupted or damaged PDF files
Free Online PDF Repair Tool
Repair corrupted or damaged PDF files. Two-stage recovery with pdf-lib and pdfjs-dist. Free, private, works in your browser.
Upload corrupted PDFs that won't open in standard readers and the tool attempts two-stage recovery using pdf-lib and pdfjs-dist libraries. First, it tries to reconstruct the document structure and fix header corruption. If that fails, it attempts deeper recovery by extracting intact page content and rebuilding the file from recoverable elements. The success rate depends on the type and extent of corruption—complete recovery isn't always possible for severely damaged files. All repair attempts process locally in your browser, keeping potentially corrupted documents containing sensitive information private on your device.
IT professionals recover project documentation PDFs corrupted during failed disk recovery operations. Students repair thesis drafts damaged when systems crashed during saving. Archivists attempt to recover historical PDF documents degraded by bit rot on aging storage media. Legal teams recover corrupted case file PDFs before critical filing deadlines when backups aren't available. Finance departments repair damaged invoice PDFs received from vendors with transmission errors or storage issues.
Always keep original corrupted files until you verify repaired versions are complete and usable—the repair process might recover partial content but lose some pages or formatting. If initial repair fails, try converting the corrupted PDF to images first using a different tool, which might preserve visual content even if structural repair isn't possible. For important documents, consider professional data recovery services if automated repair fails, especially for legal records or irreplaceable archives. Regular backups prevent corruption disasters—this tool should be a last resort rather than a substitute for proper file management. Check that all pages, images, and formatting survived the repair process before discarding the corrupted original.
All processing happens directly in your browser. Your files never leave your device — no server uploads, no cloud storage, no data retention. The tool works offline once loaded, requires no registration, and is completely free with no usage limits.
Frequently Asked Questions
How does PDF repair work?
The tool uses a two-stage approach: first, it tries to parse and re-save the PDF directly. If that fails, it renders each page as a high-quality image and rebuilds a clean PDF.
Will I lose any content?
Stage 1 preserves all content including text and images. Stage 2 (image reconstruction) preserves visual appearance but text won't be selectable.
Are my files safe?
All processing happens in your browser. Your files never leave your device.