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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.
