For online, use this website
https://tinypng.com/
https://tinypng.com/
How does it work?
When you upload a PNG (Portable Network Graphics) file,
similar colors in your image are combined. This technique is called
“quantization”. By reducing the number of colors, 24-bit PNG files can
be converted to much smaller 8-bit indexed color images. All unnecessary
metadata is stripped too. The result: better PNG files with 100% support for transparency. Have your cake and eat it too!
In the above image the file size is reduced by more than 70%.
I have excellent eyesight but can’t spot the difference either! Use the
optimized image to save bandwidth and loading time and your website
visitors will thank you.
