Image Optimization like TinyPNG [closed]

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I have searched for a good Mass Image Optimizer over Google to use on Windows or by PHP to optimize the Images of a Folder but none of them where so good like TinyPNG.com. Most of them raised the size instead to shrink. Google Pagespeed Insight likes the Sizes of TinyPNG but nothing compareable found.

Any advice I can use?

Answer 1

TinyPNG uses this library: http://pngquant.org/

Available on Windows, Linux and Mac.

Answer 2

Google PageSpeed Insights recommends two: OPTIPNG and PNGOUT. You can use them together (one by one) on the same image, often it gives a better results.