here's a few extra tools to easily compress .png and .jpg files without losing much quality, if at all:
https://pngquant.org/ (only pngs, gui and command-line tools available)
https://tinypng.com/ (pngs and jpgs, online service, 5mb limit)
apparently it's Bread Day today. i can get down with this http://waterbearer.tumblr.com/post/176523600110/what-is-lammas
i'm at @sc now for the time being, go follow me there!