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PDF repareren

Herstelt een beschadigde of niet-conforme PDF door hem opnieuw in te lezen en te schrijven — redt veel onopenbare bestanden.

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Voeg eerst een bestand toe.

"The file is damaged and could not be repaired" usually means the reader gave up, not that the document is gone. PDFs break in predictable ways — a truncated download, a cross-reference table that no longer matches the objects, a producer that wrote something not quite to spec — and in most of those cases the pages themselves are intact and merely unreachable. This tool re-parses the file, finds what is actually there, and writes a new, well-formed document around it.

It rebuilds structure; it cannot invent content. If the download stopped halfway then the last pages are genuinely not in the file, and no tool can recover bytes that were never received — expect to get back the part that arrived. Where a reader was simply refusing to open a structurally odd file, the rebuilt version usually opens everywhere.

How it works

  1. Drop in the damaged PDF.
  2. Let it be re-parsed and rewritten.
  3. Optionally also optimize it for fast web view.
  4. Download the rebuilt file and check what came back.

What people use it for

  • Opening a file that one reader refuses and another shows partially.
  • Recovering a document from an interrupted download or a failing drive.
  • Fixing a PDF produced by a system that writes not-quite-conformant files.

Frequently asked questions

Is my file uploaded to a server?
No. The file is opened by JavaScript and WebAssembly running inside your own browser tab. It is never uploaded, there is no server-side processing and nothing is stored — closing the tab discards everything.
Some pages are still missing.
Then those pages are not in the file. Rebuilding recovers what is present and rewrites the structure around it; bytes that were never received or were overwritten cannot be reconstructed. Getting back most of a document is the realistic outcome for a truncated file.
My PDF opens but behaves oddly. Is this the right tool?
Often yes. A file that opens in one reader and not another, or that prints wrongly, is usually structurally non-conformant rather than damaged. Rewriting it produces a clean file that behaves consistently.
Will anything be lost in the rebuild?
Page content, annotations and structure are carried across. Anything that was already unreadable stays unreadable, and a few exotic features may not survive a rewrite — compare the rebuilt file against what you could see before.
What is the web-view option?
It also linearizes the result, so the first page renders before the whole file has downloaded. Worth turning on if the rebuilt document is going to be published; it makes no difference to a file kept locally.

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