Pngcrush
pngcrush is an open source command line computer program that reduces the size of PNG files. The compression is lossless, meaning that the resulting image will have the same quality as the source image. The main purpose of pngcrush is to reduce the size of the PNG IDAT datastream by trying various compression levels. There is an optional "-brute" option, which performs a brute force crush when set: rather than use one of a few common methods to crush the file, it will try all of them.
See also AdvanceCOMP contains an alternative PNG compression program.
External links pngcrushQuickly compress PNG images - Add the "crush" option to the context menu of Windows Explorer.
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