How to create gif or animated image using existing image

Hi,Is any easy tool available to create gif or animated image using existing png image

are you talking within a ionic app?

Yeah!! I am just asking as general like ionic already have facility to create splash screen and other icons as well.
so it would be good if IONIC will have facility to create our own custom spinner or loader using our existing logo image.

something like gif creator…

We probably won’t go as far as making a full gif-creator, but we’re using imagemagick for the splashscreens, so that could be a place for you to start.

http://www.imagemagick.org/