Start with the source
Open the PDF in a reader and check all its pages load. Confirm whether it needs a password. Download cloud-only items fully, then try a copy in a local writable folder.
PDF contents vary
Scans, fonts, vector objects and protection mechanisms differ between documents. A supported extension cannot guarantee that every damaged or unusual PDF can be processed.
Keep useful details
Note the exact tool, error and whether it works on a different PDF. Avoid exposing a sensitive document or its password when gathering troubleshooting details.
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