Pngcrush is an open source optimizer for PNG (Portable Network
files. It is a command-line tool.
The main purpose of pngcrush to reduce the size of the PNG
stream by trying various compression levels and PNG filter methods. It
also can be used to remove unwanted ancillary chunks (such as
transparency information or textual comments), or to add certain chunks
including gAMA, tRNS, and textual chunks.
Ancillary chunks are optional information including
transparency (tRNS), gamma (gAMMA), standard RGB color space confor‐
mance (sRGB) or textual information (iTXt, tEXt or zTXt).
- Reduce the size of the image data contained in the IDAT
- Compresses the image with multiple different combinations
and then stores the smallest of the resulting files
- Remove all the color-correction data (gamma, white balance,
ICC color profile, standard RGB color profile) from PNG files
- Change the color encoding of an image
- Remove ancillary chunks
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Last Updated Tuesday, May 06 2014 @ 01:45 PM EDT