(where 100% filesize is no compression, 0% is infinite compression – which, if anybody figures out how this is done, it would probobly violate the laws of physics, and could get you into alot of trouble with theoretical scientists).
Creativyst – 99.16% file size
Dithered – Hung then crashed
JCEPro – Crashed
CodeProject – 96.39% of origional file size
Saltstorm – 94.07% file size
JSCruncher – Failed to compress.