Do my files leave my device when I use Repair PDF?

No. All processing runs in your browser inside a Web Worker. Your files are never uploaded to any server.

What is the maximum file size?

Each file can be up to 50 MB in the browser workspace. Larger files may fail depending on available memory.

What types of PDF corruption can Repair PDF fix?

It can fix broken cross-reference tables, truncated file headers, malformed page trees, and missing end-of-file markers. It rewrites the document structure to produce a valid PDF that standard viewers can open.

Will all content be preserved after repair?

Repair is best-effort. Text and page layout are typically recovered. Embedded images, form fields, annotations, and digital signatures may be lost if the underlying data streams are corrupted beyond recovery.

Can Repair PDF fix a PDF that won't open at all?

In many cases, yes. If the file header or structure is damaged, the tool can rebuild it so the PDF opens in standard viewers. However, if the file data itself is missing (e.g., a 0-byte file), recovery is not possible.

Yes, completely free with no watermarks, no sign-up, and no limits on the number of files you can repair.

Does Repair PDF work on encrypted PDFs?

Encrypted PDFs must be unlocked first. Use the Unlock PDF tool to remove the password, then attempt repair on the unlocked file.

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About Repair PDF

Repair PDF attempts to recover content from damaged or corrupted PDF files. If a PDF won't open, displays error messages, or renders incorrectly, this tool rewrites the document structure to produce a clean, readable copy — all in your browser.

Common causes of PDF corruption include incomplete downloads, unexpected shutdowns during file saving, transfer errors over email or USB, and malformed PDF generation from third-party tools. Repair PDF rebuilds the internal cross-reference tables and page tree to restore access to your content.

The tool uses pdf-lib and Mozilla PDF.js inside a Web Worker to parse the damaged file, extract recoverable objects, and write a fresh PDF with corrected structure. Because processing is local, you can safely attempt recovery on confidential documents.

Note that repair is best-effort: heavily damaged files may still lose embedded images, form fields, or annotations. However, text content and page layout are recovered in the vast majority of cases.

Last updated: 2026-06-29

How to use Repair PDF

1. Open Repair PDF Navigate to the Repair PDF tool in your browser.
2. Upload the damaged PDF Drag the corrupted PDF onto the drop zone or click to browse for the file.
3. Click Process Press the Process button. The tool parses the file, rebuilds the structure, and generates a clean PDF — all locally in your browser.
4. Review the result Once processing completes, check the output for recovered content. The tool reports how many pages were successfully restored.
5. Download the repaired PDF Click Download to save the repaired file to your device.
6. Verify in a PDF viewer Open the downloaded file in your preferred PDF reader to confirm it renders correctly.

Frequently asked questions

Do my files leave my device when I use Repair PDF?: No. All processing runs in your browser inside a Web Worker. Your files are never uploaded to any server.
What is the maximum file size?: Each file can be up to 50 MB in the browser workspace. Larger files may fail depending on available memory.
What types of PDF corruption can Repair PDF fix?: It can fix broken cross-reference tables, truncated file headers, malformed page trees, and missing end-of-file markers. It rewrites the document structure to produce a valid PDF that standard viewers can open.
Will all content be preserved after repair?: Repair is best-effort. Text and page layout are typically recovered. Embedded images, form fields, annotations, and digital signatures may be lost if the underlying data streams are corrupted beyond recovery.
Can Repair PDF fix a PDF that won't open at all?: In many cases, yes. If the file header or structure is damaged, the tool can rebuild it so the PDF opens in standard viewers. However, if the file data itself is missing (e.g., a 0-byte file), recovery is not possible.
Is Repair PDF free?: Yes, completely free with no watermarks, no sign-up, and no limits on the number of files you can repair.
Does Repair PDF work on encrypted PDFs?: Encrypted PDFs must be unlocked first. Use the Unlock PDF tool to remove the password, then attempt repair on the unlocked file.