How do i convert sprites for jo-engine?

hey guys so anyways i want to convert sprites from gif to the image format that jo-engine supports, but what programs do i need to use and also how do i create animated sprites for jo-engine?
on Windows I mostly just use Paint, lol. But IrfanView is also excellent and supports way more file formats!

for animated sprites, Jo-Engine comes with a bunch of demos, including I'm pretty sure are some for animating sprites. in fact I just looked, and there's one called "demo - sprite animation" - I'd start there!