Repair PDF

通过重建内部结构修复损坏或格式错误的 PDF 文件。您的文件永不离开设备 — 所有处理在浏览器本地完成。

设计即私密

您的文件永不离开您的设备。所有处理均在浏览器本地完成 —— 无上传、无服务器。

将 PDF 拖放到此处

或点击选择文件

您的文件永不离开您的设备。

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.

工作原理

如何使用 Repair PDF

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
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
Download the repaired PDF. The re-serialized valid PDF is offered as a download. Try opening it in your viewer to confirm the repair.

功能

此工具的功能

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

限制

须知事项

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

常见问题

常见问题解答

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.