Short version: open the free tool, drop your file, download the result. Nothing is uploaded.

Steps

Open the free WBS Rotate PDF tool and drop your PDF.
Choose the direction: 90° clockwise, 90° counter-clockwise or 180°.
Choose which pages: All pages, These pages (like 2, 5-7), or only Odd or Even pages.
Press Rotate & download. You get yourfile-rotated.pdf that opens the right way up everywhere.

Why does my rotation keep undoing itself?

The rotate button in Chrome, Edge, Firefox and Adobe Acrobat Reader only turns the view on your screen. The file on disk doesn't change, so when you email it or open it again, the page is sideways again. Every PDF page has a rotation setting stored inside the file; a real fix changes that setting and saves a new file. That's what the WBS tool does.

Fix a double-sided scan

If a scanner flipped every back page upside down, choose 180° and Even pages. One click fixes the whole document.

Does it change the quality?

No. The pages aren't re-drawn or re-compressed, so text stays sharp, selectable and searchable, and the file size barely changes. Your original file is left untouched.

Other ways

Mac: open the PDF in Preview, show thumbnails, select the pages, press ⌘R (or ⌘L), then choose File → Export as PDF. Exporting makes sure the rotation is written to the file.
Paid Acrobat: Organize Pages → rotate → save.

Rotate PDF is completely free with no page limit. It runs in your browser, so the PDF is never uploaded. Need to remove pages too? See how to delete pages from a PDF.

More free guides

All tools: WBS Tools · All apps: Wood Between Studio apps