Compressor.io is a free, online image compression utility. It reduces the size of images and photos without affecting the quality. It supports JPEF, PNG, GIF, and SVG file formats and can compress up to 90%. It can do lossess or lossy compression based on your needs.
It's very easy to use and works great when you really need to shrink the size of an image. Just click "Try It", upload or drag and drop your file and select the compression.