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I'm looking for something like Smush.it or PunyPNG that works offline, preferably via command line interface that does gifs, jpegs and pngs.

Any suggestions?

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up vote 4 down vote accepted

PNGCrush is the first that comes to mind.

Trimage is a bit more comprehensive as far as toolset, and has a GUI also.

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For Mac there's ImageOptim and ImageAlpha.

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