This was SO LONG ago, but thank you so much for replying!! <3 I haven't tried doing exactly 100x100, I've been doing 95x95, so perhaps that would help. I haven't done JPG because I highly dislike it's compression style. What I'm uploading is pixel art so I want the colors to be crisp. JPG has a funny way of muddy-ing up the colors. I'll give uploading it that way a shot, though.

Again, sorry for the late reply but thank you so much for your advice. I really appreciate it!