I just want to introduce Compress-Or-Die which is an online compression tool especially created for the creators of banners... so I hope for the most of you.
It isn't a tool like tinyjpg or jpegmini that just allows to shrink existing JPGs a little bit. It's the one that creates your (also low quality) images from your original data and really squeezes out the last byte. And allows things like JPGs with transparency and "Selective quality" (as known from Adobe Fireworks) btw
HOLY CRAP!!! That transparent jpg trick is amazing. It reduced this image from 2.19MB to 363k. One note, I had to add a crossorigin="anonymous" attribute to get it to work with assets hosted on CodePen.
See the Pen 780d362575b608e73b45789030a64b7e by osublake (@osublake) on CodePen