Optimizilla
Optimizilla uses a smart combination of the best optimization and lossy compression algorithms to shrink JPEG and PNG images to the minimum possible size while keeping the required level of quality. Upload up to 20 images. Wait for the compression to finish. Click thumbnails in the queue for a quality setting. Use the slider to control the compression level and mouse/gestures to compare images. This is a very handy and easy to use online tool. You can use it for personal need or for your business, like optimizing your images you upload to your website. Note that Optimizilla has changed their website address to imagecompressor.com.
Source: Optimizilla
