Why the viewer's rotate button isn't enough
Rotating in a PDF viewer only changes what you see until you close the window — the file itself is unchanged, so it opens sideways again for the next person. To fix it for good, the rotation has to be written into the document.
How to do it
- Open Rotate PDF and add your file.
- Click the page thumbnails to rotate individual pages, or rotate all at once.
- Download the corrected file — it now opens the right way in every viewer.
Where sideways pages come from
Sheet-fed scanners rotate landscape pages, phone "scans" inherit however you held the phone, and double-sided scanning can flip alternate pages. You can rotate each page independently, which handles mixed documents.
Private and lossless
Rotation only updates each page's orientation — no re-rendering, no quality loss — and runs entirely in your browser.