Repair PDF

About PDF Repair Tool

This tool repairs corrupted, damaged, or unreadable PDF files. It analyzes your PDF for structural issues, fixes cross-references, rebuilds the document structure, and attempts to recover all pages. All processing happens securely in your browser.

What types of PDF damage can this tool fix?

This tool can repair various PDF issues including corrupted headers, invalid cross-reference tables, missing EOF markers, damaged page content, and broken internal links. It works by rebuilding the PDF structure from scratch.

How does the PDF repair process work?

The repair tool first analyzes your PDF to detect issues. Then it attempts multiple repair strategies: rebuilding the document structure, fixing cross-references, recovering pages one by one, and removing corrupted objects while preserving valid content.

What if my PDF cannot be fully repaired?

Some severely corrupted PDFs may only be partially repairable. The tool will recover as many pages as possible and notify you of any pages that couldn't be restored. You can still download the partially repaired version.

Is there a file size limit?

The maximum file size is 100MB. This larger limit accommodates corrupted files that may have bloated in size. For very large files, the repair process may take a bit longer.

Will the repair process preserve my PDF content?

The tool prioritizes content preservation. Text, images, and page layouts are maintained whenever possible. However, severely corrupted sections may need to be removed to create a valid PDF.

Can this tool fix password-protected PDFs?

The tool can attempt to repair encrypted PDFs, but you may need to provide the password for full content recovery. For PDFs with unknown passwords, consider using the Unlock PDF tool first.

How do I know the repaired PDF is actually valid?

After every repair the tool re-checks the saved file, not just the input. It confirms the %PDF- header and %%EOF marker are present, reparses the structure with pdf-lib to count readable pages, and opens the document in the PDF.js renderer. You get a clear pass/fail verdict plus a downloadable repair report (.txt) listing each check, the issues that were detected, and how many pages were genuinely recovered versus inserted as blank placeholders. This gives you auditable proof the output parses correctly.

Does this tool remove passwords or DRM from a PDF?

No. Repair fixes structural corruption (broken xref tables, missing EOF, damaged objects); it does not strip passwords, encryption, or DRM. If your PDF opens but asks for a password, or you need to remove owner restrictions, use the Unlock PDF tool instead. Repair can still open encryption-protected files in lenient mode to rebuild structure, but it will not bypass a password you do not have.

Is my PDF file secure?

Absolutely! All PDF repair and verification processing happens entirely in your browser. Your files are never uploaded to any server, which makes the tool suitable for confidential legal, medical, and financial documents that must never leave your device.

What should I do if repair fails?

If automatic repair fails, try uploading the PDF again or use a backup copy if available. Some PDFs may be too severely damaged for browser-based repair and may require specialized desktop software.