pngcrush

Optimize and compress PNG files to reduce file size.

brewmacoslinux

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Optimizer for PNG files

pngcrush

compress a PNG file to make it smaller$ pngcrush input.png output.png

reduce PNG file size with maximum compression$ pngcrush -9 input.png output.png

optimize all PNG files in a directory$ for file in *.png; do pngcrush "$file" "compressed_$file"; done

compress PNG and remove metadata to save space$ pngcrush -rem alla input.png output.png

optimize PNG while keeping color profile information$ pngcrush -keep iCCP input.png output.png