In fact, the program allows you to perform the following conversions:
Convert mp3 to wav, m4a, aac, wma and ogg.
Convert wav to mp3, m4a, acc, wma and ogg.
Convert m4a to mp3, wav, aac, wma and ogg.
Convert aac to mp3, wav, m4c, wma and ogg.
Convert wma to mp3, wav, ogg, m4c and aac.
Convert ogg to wma, mp3, wav, m4c and aac.
And you can choose different quality outputs depending on the size and destination of the file.
You only need to choose the files you want to convert and the output folder for them. The rest will be the task of Free Audio converter. Furthermore, the program also offers a list of preset output profiles than can be very helpful if you don't know a lot about audio file conversion.
Finally, you can convert audio files one by one or take advantage of batch conversion, as well as edit their tags.