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Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels an PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including gAMA, tRNS, iCCP, and textual chunks.
<html><head><title>pngcrush changelog</title></head><body> <pre> Change log: Version 1.6.20 (built with libpng-1.2.38 and zlib-22.214.171.124) Changed local variable "write" to "wwrite" in inffast.c (zlib) to avoid shadowed declaration warning. Version 1.6.19 (built with libpng-1.2.37 and zlib-126.96.36.199) Added missing braces that cause an incorrect png_error() to be issued. Version 1.6.18 (buil more»