Radical Image Optimization Tool (RIOT) is a free image optimizer that will let you visually adjust compression parameters while keeping minimum file size.
Reduce Image Size using RIOT
RIOT will reduce image size. It uses a side-by-side or single view interface to compare the original with the optimized image in real-time and instantly see the resulting file size.
It is lightweight, fast, and simple to use, yet powerful for advanced users. You will be able to control compression, the number of colors, metadata settings, and much more, and select image format eg JPG, GIF, or PNG, for your output file.
Available as a stand-alone executable or dynamic link library for developers, RIOT can also be used as a plugin for programs like GIMP, IrfanView or XnView.
You can download it here from its homepage.
TIP: FILEminimizer Pictures is another free software to reduce the size of your images, photos, and pictures.
Speaking of optimization … have you optimized your Windows folders, for a fast load-up?