Optimize png Files, oxipng

oxipng

• as of 2023-01-23, this is best for optimize png files.
• oxipng is rewrite of optipng, in rust lang.
• oxipng project started in 2015.

typical usage:

# optimize one file
oxipng -o 4 --strip safe filename.png

# optimize all png files in current dir
oxipng -o 4 --strip safe *.png

• -o 4 → means level 4 optimization. (default is 2)
• --strip safe → means Strip safely-removable metadata objects

oxipng -h for help

oxipng Manual

• oxipng_manual.txt

optimize png files

Just optimized 6751 png files on my sites. They were already optimized by optipng. Most files is about 5% to 10% decrease in size.