How can I rotate PDF files by 90° in Google Chrome?

As of Chrome 17 you can right-click on the PDF and choose "Rotate clockwise" or "Rotate counterclockwise".

Unfortunately, with Chrome, you cant. You can read the article about it here. You will have to open it in another browser, or within Acrobat.

In IE, for example, you can press Ctrl+Shift++ or - to rotate a PDF in the browser.

Use ctrl+] to Rotate the .pdf file Clockwise and Use ctrl+[ to Rotate the .pdf file AntiClockwise