Lossless compression means that you reduce the size of an image without any quality loss. Usually this is achieved by removing unnecessary metadata from JPEG and PNG files. We say usually, because with some other compression algorithms, like Imagify, other compression opportunities are leveraged without sacrificing the image’s quality. In theory, there are some image formats that are considered to be “lossless” such as GIF, PNG and BMP. However, depending on how they are optimized for the web, these formats may see a slight loss in quality (that your eyes won’t be able to pick up). The big benefit of lossless compression is that it allows you to retain the quality of your images while reducing their file size.