zImageOptimizer

Simple script that losslessly optimizes JPEG, PNG and GIF images on Linux/macOS/FreeBSD.

Desktopfree

zImageOptimizer is a free, simple script that losslessly optimizes JPEG, PNG and GIF images across a whole directory tree on Linux, macOS or FreeBSD. It's aimed at sysadmins and developers who want to optimize an entire folder of images in one pass rather than one file at a time.

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