Fix: "The file is damaged and could not be repaired"
The error 'The file is damaged and could not be repaired' means your PDF is either truncated (the download or transfer cut off before the file finished writing) or was generated by software that broke the PDF spec in a way readers refuse to open. The file itself is the problem, not your reader — so the fix has to start with getting a valid copy of the PDF.
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About .pdf to EPUB conversion
Can OpenAny convert a damaged PDF to EPUB anyway?
Sometimes, yes. OpenAny uses a different PDF parser than Adobe Reader or Chrome, so it occasionally recovers enough content from a partially-written file to produce a usable EPUB. Upload it and try — if the file is too broken to parse at all, you will get a clear error rather than a silent failure. It costs nothing to attempt.
How do I tell if the PDF is truncated versus just corrupt?
Check the file size: if you downloaded a 200-page book and the file is only 40 KB, it almost certainly got cut off mid-transfer. A truncated PDF will often open partially in some readers before failing. A spec-violation file (produced by a buggy exporter) is usually the right size but fails immediately on every reader. In both cases, re-downloading or requesting the file again from the source is the fastest fix.
I cannot get a new copy — is there any way to repair the PDF before converting?
Try the free online tool PDF24 or the command-line tool 'mutool clean input.pdf output.pdf' from the MuPDF package, which can reconstruct a valid cross-reference table and recover text from many truncated files. Adobe Acrobat Pro's 'Save As' on a damaged file also repairs some issues. Once you have a file that opens without errors, upload the repaired PDF to OpenAny to convert it to EPUB.