Online UniConverter (or Media.io) is a free online audio converter that converts your audio files to a wide range of output formats. In addition to audio files, Online UniConverter supports video formats as well. It's easy to use, supports multiple languages and converts your files quickly. You can upload your files or import them from an URL, select the quality you desire and they will instantly be converted. The files that you upload will be removed from their servers after one hour. The conversion service can either be used online, or through their software for Windows and MacOS. These can be found on their download page. Their software comes with a couple of advantages over the online service like: