RIOT (Radical Image Optimization Tool) is a free program which allows for easy resizing, compression, conversion, and adjustment for images. RIOT uses JPEG, GIF, and PNG formats.
This tool is a simple way to scale down an image in resolution, or to make an image smaller by adjusting quality for the web or email. It is the program that is used to scale down the images in this website.
RIOT is about 1.7mb in size and uses about 9.8mb of memory when open, making it quite fast to open and quickly use.
RIOT is completely free, but donations to the developer are welcome.
Although RIOT does convert and optimize PNG images, large images in PNG format do have some difficulty and RIOT’s memory use in these cases tends to not be very efficient.
RIOT can be used as a plugin for Irfanview and GIMP.