erlndgdt

If you need to losslessly optimize and image for free which is up to 1mb in size, you can use this: https://kraken.io/web-interface

If you need a larger file size you'll need to create an account. Just thought I would drop that here since nobody has mentioned it yet.

How is this different from say, what https://kraken.io is doing. When I upload images there I get a smaller file size and the image looks no different