E-Mage is a cross-platform, multi-algorithm bulk JPG, PNG, SVG, and GIF file optimizer tool for lossless image compression.
You are given the ability to choose and set the algorithm for the file type you are working with and then the image. One requirement is that the algorithm must be selected before image selection since the optimization process immediately starts once you choose the image(s). Also, once the process is completed, there is no way to undo it.
E-Mage allows bulk processing, however, it can only be done via individual files and not entire folders. Once you have all the files optimized, you can then inspect the results from the bottom of the main window. You can view the original and new size, the percentage of reduced size, and the used tools. Additionally, you can observe the amount of total saved bytes and the percentage from the last line in the inspection area.