Rotation is complete only after the downloaded file has been inspected. Keep the exact source, scope and direction together until the result is accepted. The tool reports what it changed, but the destination viewer and workflow remain authoritative.
Verify count, order and orientation
Open source and result side by side. Confirm the page count is identical. For selected scope, verify every listed page gained the intended relative turn and sample an untouched page before and after each range. For all-page scope, inspect the first, middle and final pages plus every orientation change in the source. Existing rotations matter: adding 90° does not force every page to 90°.
Exercise relevant document features
If the ordinary document contains forms, links, comments, bookmarks, attachments, layers, page labels, accessibility tags or signatures, test every feature you actually rely on. A digital signature from the source does not sign newly serialized bytes. Do not describe the result as signed, archival, compliant, accessible or accepted for filing merely because its visible pages now face the right way.
A new PDF needs an independent check
PDFRotate changes page rotation entries and serializes a separate file. It does not promise byte identity or preservation of every document-level feature. Metadata, outlines, page labels, attachments, optional layers, tagged structure, PDF/A or PDF/X claims, usage rights, encryption, incremental revisions and digital signatures may change or stop applying. Forms, annotations, links, crop boxes and accessibility relationships can depend on viewer behavior. Keep the untouched source, open the download in another trusted viewer and inspect every affected page before using it.