tinypng

TinyPNG is a tool for intelligent compression of WebP, PNG, and JPEG images. It is intended for users who want to reduce the file size of their images. The software uses smart, lossy compression techniques to reduce the file size. It selectively reduces the number of colors in the image, which requires fewer bytes to store the data. The essential functions of TinyPNG are the compression of images and the support of transparency. It's compatible with all modern browsers and mobile devices. TinyPNG's pricing model is free for all users. For advanced features, there is a Pro version.