User blog comment:Ninja3567/Pictures/@comment-4324061-20111126180118/@comment-3447485-20111126213538

JPG is almost always smaller than PNG, but it really depends on the complexity of the image and the compression ratio (which you can control with GIMP, but not with MS Paint. Default in the old Paint is 80% and default in new Paint with Windows 7 is 98% (which is very high quality).