pngquant is a command-line utility and library for lossy compression of PNG images. The conversion reduces file sizes significantly and preserves full alpha transparency. Generated images are compatible with all web browsers and operating systems. It offers a fast mode for real-time processing and integrates with shell scripts, GUIs and server-side software.
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imageoptim.com
ImageOptim is a free, open-source Mac app that compresses images without losing quality, reducing file sizes for faster loading and less disk space use. It removes private EXIF metadata, comments, thumbnails and unnecessary color profiles. It combines tools including MozJPEG, pngquant, Pngcrush, 7zip, SVGO and Google Zopfli, and accepts drag-and-drop input. Lossy minification is an optional setting.