How do I rotate PDF pages and save the changes for free?

I have a PDF with a few pages that are sideways, while the rest are in the correct orientation. I need to rotate only those pages by 90 degrees and save the file so they still appear correctly when someone else opens it.

I usually view PDFs in Microsoft Edge, but I’m not sure whether rotating a page there changes the saved file or just the way I see it. Is there a free way to make the rotation permanent without Acrobat Pro? I’d also be interested in whether the same method can rotate every page when an entire PDF is upside down.

Thanks for any guidance.

NathanReed