The file is damaged and could not be repaired.

What's actually wrong

This is Adobe Acrobat/Reader's message when a PDF's cross-reference table (the internal index that tells the reader where each object lives) is broken or points to the wrong place. In the vast majority of cases the actual page content is completely intact — the file just can't be indexed, which is why it often still opens in a web browser but not in Acrobat. Rebuilding the cross-reference table recovers the whole document.

Free fixes — try these first

1. Try opening the file in your web browser (drag it onto a Chrome/Edge tab) — browsers use a far more tolerant PDF parser and frequently open files Acrobat rejects. If it opens, use the browser's Print → Save as PDF to write a clean copy.
2. Open it in a different reader: SumatraPDF (free), Preview on Mac, or Google Drive (upload, open, then File → Download).
3. In Acrobat, try File → Open from within the app rather than double-clicking, and let it run its own repair prompt.
4. If you downloaded or were emailed the file, re-download it — a truncated transfer is a common cause and the source copy may be fine.

If the free fixes fail

When the browser and other readers also refuse it, the cross-reference table needs to be rebuilt from the surviving objects — that's exactly what our analyzer does, in your browser, showing how many pages it recovered before you decide anything.