How do you crop a JPEG picture and then save it back as a JPEG??

I took some pictures with my camera of people, then I uploaded them into my computer. Now I want to just crop the photos so it's just the heads of the people, and then save the newly cropped picture as a JPEG? I don't have photoshop, and I know you can do that easily in that program, but what else/or how... show more I took some pictures with my camera of people, then I uploaded them into my computer. Now I want to just crop the photos so it's just the heads of the people, and then save the newly cropped picture as a JPEG? I don't have photoshop, and I know you can do that easily in that program, but what else/or how else can you do that??

Thanks for answers!
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