Crunch is an OS X tool for PNG image file optimization. It combines selective bit depth, color type, and color palette reduction with zopfli DEFLATE compression algorithm encoding using embedded versions of the pngquant and zopflipng PNG optimization tools. This leads to a significant file size gain at the expense of longer file optimization processing times and relatively modest decrease in image quality.


  • Optimize PNG files.
  • Lossless quality.
LicenseFree and Open Source
Supported Platforms

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