Smush.it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality. After Smush.it runs on a web page it reports how many bytes would be saved by optimizing the page's images and provides a downloadable zip file with the minimized image files. Do not
![Yahoo! Smush.it™](https://cdn-ak-scissors.b.st-hatena.com/image/square/eb3e4e28fae2a1df0da96abd27cbbe0d94f899f6/height=288;version=1;width=512/http%3A%2F%2Fl.yimg.com%2Frz%2Fd%2Fyahoo_en-US_f_w_350x40_2x.png)