GiftOfSpeed - How fast is your website from different parts in the world? Get a free detailed speed report, including fixable performance issues.
Compressnow - Compressnow is a web service used for compressing the image to be used for different purposes in the websites or promoting the products as this is a problem for both web developers and end-users.
Geekersoft Free Online Image Compressor - With this online image compression tool, you can quickly compress photos in JPEG, JPG, PNG, GIF and other formats and export high-definition images.
ImageResizer - Free online app to crop and resize images
Teeny Tokyo - A surprisingly-powerful bulk image resizing app
Optimizilla - Optimizilla is an online image optimizer uses a smart combination of best optimization and lossy compression algorithms in order to shrink JPEG and PNG pictures to the minimum possible size while keeping the required level of quality.