Rotate a GIF online
You can also use: http://ezgif.com/rotate?url=http://link/to/image.gif
Online animated GIF rotator
This is a GIF image transformation tool.
Here you can flip the image (mirror) horizontally and vertically, and rotate (spin) it using presets or by entering freely chosen degrees.
It can rotate animated GIF, WebP, APNG files as well as almost any other non-animated image format.