On any typical website, smaller images = faster loading time and lesser bandwidth consumed. It is really important to find an optimal balance between image quality and image size. Anything "un-optimized" image will parasitically suck your bandwidths and cost you a bomb if you are paying for these bandwidths (like me). If you really liked to reduce images file size and doing it the quick and easy way, I thought you should know Smush.it
Smush.it is a really useful webs service I recently came to know. It optimizes your images online, and they do it for free. Smush.it does it in 3 different ways, you can either:
Upload a bunch of pictures in your browser, or
Provide an URL link, or
Do optimization on the fly on any website with Smush.it Firefox Extension or bookmarklet.
There’s also a optimization summary report comparing the before and after compression, in terms of bytes and %.