Pngcrush

Pngcrush is a free command line tool to optimize the compression of PNG image files, so the file size in most cases is reduced. The recompression is done without loss of quality.

Pngcrush compresses only the image data again and retains the color format in. In many images, it is also possible to choose a more compact lossless color format ( about 4 - bit grayscale instead of a color chart with 16 shades of gray). For the program pngrewrite created, which should be carried out before pngcrush.

The tool is developed by Glenn Randers - Pehrson, and is available, among others, for Linux, Mac OS X and Windows. Writing, the current source version 1.7.67 was released on August 2, 2013.

There are other programs to recompress PNG files, usually with slightly more compact results about OptiPNG or PNGOUT.

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