RIOT – a small utility to optimize an image size for the purpose to locate them on the internet. The software supports many input image formats that can be converted to JPG, GIF or PNG. RIOT allows you to specify the necessary image size and visually compare the original with the compressed image using a two-window mode and a pixel-by-pixel comparison. RIOT enables to compress images to a given volume, adjust brightness or contrast, transfer or delete metadata, control the number of colors, etc. The software can automatically process the images with the default or manually established settings where all settings are adjusted by the user. RIOT also supports the batch conversion of images and has an intuitive interface.