pngcrush

PNG compression utility. More information: https://pmt.sourceforge.io/pngcrush.

• Compress a PNG file:

pngcrush in.png out.png

• Compress all PNGs and output them to the specified directory:

pngcrush -d path/to/output *.png

• Compress PNG file with all 114 available algorithms and pick the best result:

pngcrush -rem allb -brute -reduce in.png out.png