You need Adobe Acrobat Standard or higher to edit pdf files.
1) Open your document in Adobe Acrobat (not Acrobat Reader).
2) Click on the “Pages” tab on left side of the page. Alternatively, use the keyboard shortcut Shift + Ctrl + R, to open the rotate pages dialog.
3) Right-click on the thumbnail image of the page you want to rotate. You will have the default choice to rotate the selection or you can choose a range of pages to rotate.
4) Save your changes.
NOTE: The common pitfall is using menu View -> Rotate View -> Counterclockwise and save the document, which will only temporarily rotate, not permanently.
You should be aware that Adobe Acrobat requires an $11/month subscription to use this feature.
3Where is Documents located in Adobe Reader? There is no Documents tab? – Kala J – 2014-07-31T14:17:02.257
2@KalaJ: jwade isn't talking about Adobe Reader, he's talking about Adobe Acrobat, which unlike Adobe Reader is not a free product. – twasbrillig – 2014-10-20T05:19:24.097
3If you rotate it from the Toolbar via VIEW it won't save the rotated format. The save option is actually grayed out. If you go to the right side bar with TOOLS » COMMENT » SHARE. Choose Tools and rotate your pages from there, it will save just fine. – None – 2013-02-26T20:36:45.907
@user202541 I have success following your method, why not put it as answer? – checksum – 2014-05-10T03:22:35.980
2This is the best answer. It is done within Acrobat. – Vennsoh – 2014-06-03T03:29:03.190