Makeup is a free program that enables you to reduce the file size of JPEG images. It also does a few other things too. JPEG images have a compression quality, where the size of the image is reduced and its quality is reduced too. Usually, you can reduce the quality of the image to make the file size much smaller, as when you wish to put the image on the internet or send it by email. Reducing the quality may not make the image look significantly worse.