Encapsulated postscript (EPS) files are vector files. They do not lose resolution when you enlarge those figures. But when you convert other types of files to eps files, it has been a big hassle. Here, I want to show you that you can convert any file types to eps for free. All you need to do is to download inkscape.
https://inkscape.org/. Then load your original file and then save it in less than two minutes. You are done!