Convert PNG to WebP (Lossless)

gistfile1.txt

# -lossless
# create a lossless image
# you can use '-z 9' to really make a small image,
# but my tests show that it only produces around 1% better compression rate,
# with much longer compression times
#
# -resize 1080 1920
# (optional) resize the image

cwebp -lossless -resize 1080 1920 image.png -o image.webp

# -define webp:lossless=true
# create a lossless image
#
# -resize 1080x1920
# resize the image to 1080x1920

convert image.png -define webp:lossless=true -resize 1080x1920 image.webp