Rotation does not touch quality
Rotating a PDF page only changes the instruction that says how far to turn it when displayed, so text and images are not recompressed. Text selection, search and links keep working.
If a receipt or table was scanned sideways, rotate just that page with the left or right button and save.
Your files never leave your device
Most online PDF sites upload your file to a server, process it there and send it back. Pagefold loads the PDF engine into your browser and does the work on your own device. Contracts, ID scans and school records stay with you, and there is no upload to wait for on a slow connection.