pngquant

v 2.17.0 Updated: 6 months, 3 weeks ago

command-line utility and library for lossy compression of PNG images

pngquant is a command-line utility and library for lossy compression of PNG images. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all modern web browsers, and have better fallback in IE6 than 24-bit PNGs.

http://pngquant.org/

To install pngquant, paste this in macOS terminal after installing MacPorts

sudo port install pngquant

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