All Converter Pro
Repair a Damaged PDF
在线免费修复损坏的 PDF。重建文件结构,使损坏的文档重新可以打开,并优化 PDF 以加快加载。无需注册。
关于此 修复 PDF 工具
Repair PDF rebuilds a document whose internal structure has been damaged. A PDF keeps an index of where every object in the file lives; when that index is broken - by an interrupted download, a failed transfer, a crashed program or a faulty USB drive - readers report the file as corrupt or refuse to open it even though the page content is still there. This tool reconstructs the index from the objects it can find and writes a clean, linearized copy. Linearizing also means the file is optimized for fast web viewing, so the first page appears before the whole document has downloaded. Be realistic about what recovery can achieve: if the underlying page data itself was lost or truncated, no tool can invent it back.
如何使用 修复 PDF
- 打开工具并添加您的文件、文字或数值。
- 检查可用选项,例如页面范围、输出格式、质量、密码或语言。
- 开始处理,并在完成前保持浏览器窗口打开。
- 下载结果,如有需要可继续使用相关工具。
实用提示
- 对于扫描的 PDF,支持 OCR 的工具会尽可能自动运行文字识别。
- 对于大文件,在通过邮件分享或上传到门户网站之前,请使用压缩工具。
- 为获得最佳效果,请上传扩展名正确的干净文件,避免使用损坏的文档。
Before you repair
Keep a copy of the original file. Repair writes a new document and never modifies your upload, but keeping the source means you can try other approaches if needed.
If the file was downloaded, try downloading it again first - an interrupted transfer is the most common cause of a corrupt PDF, and a clean copy solves it outright.
If the PDF is password-protected and will not open, that is encryption rather than damage. Use Unlock PDF with the password instead.
常见问题
What kind of damage can be repaired?
Structural damage - a broken cross-reference table or index, which is what causes most "file is corrupt or damaged" errors after an interrupted download or transfer. The page content is usually intact and just needs re-indexing.
Can every broken PDF be recovered?
No. If the file was truncated or the page data itself is missing, that content is gone and cannot be reconstructed. Repair works when the content survives but the structure pointing to it does not.
Will repairing change how my document looks?
No. Pages, text, images and fonts are preserved. Only the file structure is rebuilt.
What does "linearized" mean?
The repaired file is written optimized for web viewing, so a reader can display the first page before the entire file has downloaded. Repairing therefore often makes a working PDF open faster too.
My PDF opens but behaves oddly - is this useful?
Yes. PDFs with minor structural inconsistencies can print incorrectly or fail to load in some readers. Rewriting the file cleanly often resolves that.
免费吗?
Yes - free, no account, and no watermark.