TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG files. By selectively decreasing the number of colours in the image, fewer bytes are required to store the data. The effect is nearly invisible but it makes a very large difference in file size!
PNG is useful on the web because it’s the only widely supported format that can store partially transparent images. The format uses compression, but the resulting files can still be large. Use TinyPNG to shrink images for your website. It will use less bandwidth and load faster.
Download Link: http://tinypng.org/
License: License Free