Sejda PDF

Repair PDF

Recover a document that refuses to open.

Drag & drop your files here

Supported: PDF

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About Repair PDF

Interrupted downloads and failing drives leave PDFs with broken cross-reference tables. The repair tool rebuilds the internal structure and salvages every page it can still read.

  • Rebuilds broken cross-reference tables
  • Recovers readable pages
  • Clear report of what was lost

How to repair pdf

  1. 1

    Upload the broken file

    Even files that error out elsewhere are worth a try.

  2. 2

    Rebuild

    The page tree and object table are reconstructed.

  3. 3

    Download

    You get back everything that survived, with a report.

A practical guide to repair pdf

Signs a PDF needs repair, not conversion

Repair is the right tool when a file will not open at all, opens to a blank or partial view, or throws an error about a damaged or missing cross-reference. These symptoms usually follow an interrupted transfer, a full disk during saving, cloud-sync conflicts, or a storage device that is starting to fail. If the file opens perfectly but you dislike its layout or want editable text, you want a converter instead. Reach for repair only when the document itself is broken, and try it before you give up on a file, because partial recovery is far more common than a total loss.

Improving your odds of a full recovery

Always work from the most complete copy you have. If the file came from a bad download, re-fetching it once more sometimes gives a cleaner source than repairing a truncated one. Avoid opening and resaving a damaged PDF in a viewer first, because a forced save can overwrite the very objects the rebuild needs. A file that is zero bytes has nothing to read and cannot be recovered, so check the size before uploading. When the repaired result comes back, read the accompanying report so you know exactly which pages survived.

What to do after the rebuild

Once you have a working copy, verify it end to end rather than trusting the first page. Scroll through, test any links, and confirm that later pages render, since corruption sometimes clusters toward the tail of a file. If a few pages were lost, you can rebuild the document by pulling the good pages out and merging in a clean copy of the rest from another source. It is also worth compressing or re-optimizing the recovered file so a fresh, consistent structure replaces the patched-together one, giving you a document that behaves normally in every reader from then on.

Frequently asked questions

What kinds of damage can this actually fix?
It targets structural corruption: broken cross-reference tables, a scrambled object index, or a truncated file left behind by an interrupted download or a failing drive. It rebuilds the map that tells a reader where each page lives. It cannot invent content that was never written to disk, so genuinely missing bytes stay missing.
Why does my reader say the file is damaged when it looks fine elsewhere?
Some readers are strict and refuse a PDF whose internal tables do not match the object data, even when most pages are intact. Repair reconstructs those tables so tolerant and strict readers alike will open the result. If only certain pages were affected, the summary lists what could and could not be salvaged.
Will repairing lose my form fields, links or bookmarks?
The tool preserves every interactive element whose underlying data survived the corruption. Fields, links and outline entries that were fully intact come through in the rebuilt file; anything whose bytes were destroyed is reported as lost rather than silently dropped.
Is my broken document safe to upload here?
Yes. The file is handled only for the length of the session and then deleted automatically, no sign-up is required, and your original stays on your device untouched in case you want to try a different recovery approach. The repaired copy is a new download that opens in any reader.

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