I've had the best luck using opitpng and then pngout. https://github.com/ajslate... | Hacker News

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		ajslater on July 16, 2014 \| parent \| context \| favorite \| on: Mozilla Advances JPEG Encoding with Mozjpeg 2.0 I've had the best luck using opitpng and then pngout. https://github.com/ajslater/picopt ...will do this automatically for you. Pictopt: A multi-format, recursive, multiprocessor aware, command line image optimizer utility that uses external tools to do the optimizing. For an all in one GUI for Mac approach to this, try ImageOptim

imaginenore on July 16, 2014 [–]

PNGOut is definitely better than OptiPNG most of the time:

http://www.olegkikin.com/png_optimizers/

jibsen on July 16, 2014 | [–]

zopflipng (with -m switch) is close to or better than the best on those five images:

    1_zopflipng.png  8.466
    2_zopflipng.png 18.739
    3_zopflipng.png  8.012
    4_zopflipng.png 91.879
    5_zopflipng.png  1.117

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