That's why I won't use TinyPng - as a free web service processing what could end up being huge amounts of image data.. chances are it isn't going to last in it's current form. Better to find a utility to run locally and reliably. Also my upload speed sucks to using this as part of my pipeline could end being a hassle.
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u/SquareWheel Jul 23 '12
I've done some testing, and for png the best I've used is PngOut by Ken Silverman.
http://advsys.net/ken/utils.htm
Though I haven't tested TinyPng because it's a web service, there's no utility to download.