Rota is a freeware program that lets you rotate your photographs without harming the image quality. Pretty useful if you’re doing a lot of vertical type shooting.
Loss-less JPEG Rotation doesn’t de-compress JPEG image completely and moves intermediate data from-to rotate 90/180/270 degrees position. It doesn’t cause loss of image quality. The samples shown above do loss-less JPEG rotation 4 times by Rota. No loss of image quality occurred.