Convert WMA to mp3 with Switch Free Audio and Mp3 Converter for Windows. It is free software that can convert mp3, WAV, or WMA format and more to the format of your choice. It is very easy to use and free. Just add the files you want to convert to the list, select the format you want to use, and then click the convert button. Automatically normalize audio while converting. Access an online database to add song information as you convert for free.