GetPortable Romeolight PNGmicro Free. Itis a useful tool that allows users to optimize PNG files and reduce file size. The PNG file format is the most used one because it has a good compression rate and browser compatibility. This software allows you to reduce the size of the files and ultimately reduce the amount of traffic. This decreases the total download time and helps the user download in lesser time. There are two modes that allow you to compress the file: lossless compression mode and lossy compression mode.