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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.
Pngquant is a lossy PNG compressor that converts images to an 8-bit PNG format with alpha channel, often producing files 60-80% smaller than 24/32-bit PNGs. It uses palette generation and dithering, offers a configurable quality range, and supports batch conversion and Unix-style stdin/stdout chaining. The compression engine is also available as an embeddable library.
Crunch is a tool for lossy PNG image file optimization that combines selective bit depth, color type and color palette reduction with zopfli DEFLATE encoding using the pngquant and zopflipng tools. It is distributed as a command line executable for macOS, Linux and Windows environments, a native macOS drag-and-drop GUI, and a macOS right-click menu service.
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.
