Did a scan come out upside down? Rotate pages by 90°, 180° or 270° to straighten the PDF permanently. Your file never leaves your device.
Yes — in the new PDF, the pages' rotation actually changes, so anyone who opens it will see it straight. This is not just a temporary rotation in the viewer.
No — all the work happens in your browser.
No — only the direction changes, the content stays exactly the same.
In this version there is a "first page only" option. For any other page, first separate that page with Split PDF, rotate it, then Merge it back.