Rotate PDF: turn pages and save them the right way up
Rotate each page from its thumbnail or all of them at once, then download the file with the position saved: it won't flip back when the PDF is opened again. Text pages that are sideways or upside down are found by the direction of the letters.
Your PDF never leaves your device
PDF and its pages
Everything happens in this tab; your PDF isn't changed, a new file is created.
How to rotate
Missing: the PDF.