Comparison of lossless PNG compression tools

Pic 1 %improvement Pic 2 %improvement Pic 3 %improvement Pic 4 %improvement Pic 5 %improvement
Original 20304 22953 9703 96828 2492
PNGOut 8619 57.55% 18680 18.6% 7998 17.6% 96698 0.1% 1108 55.5%
AdvanceCOMP 8931 56.01% 19121 16.7% 8701 10.3% 92219 4.8% 1124 54.9%
OptiPNG 9979 50.85% 20671 9.9% 9703 0.0% 93658 3.3% 1201 51.8%
PunyPNG 9979 50.85% 20671 9.9% 9703 0.0% 93717 3.2% 1204 51.7%
SmushIt 14207 30.03% 22953 0.0% 9698 0.1% 93619 3.3% 1615 35.2%
PNGCrush 14207 30.03% 20671 9.9% 9703 0.0% 93658 3.3% 1652 33.7%
PNG Recompressor 14268 29.73% 24339 -6.0% 9664 0.4% 95161 1.7% 1617 35.1%
RIOT 20424 -0.59% 20643 10.1% 10404 -7.2% 101904 -5.2% 1818 27.0%