With AVConverter you can convert, trim and extract audio and video formats.
AVConverter is a full-featured program that can edit audio files and create ringtones. It can help you convert, trim, extract a lot of audio and video formats (aac,flac,m4a,mp3,wav,wma,avi,mp4,wmv,3gp,mkv,mov,m4v,m2v...).
The program enables users to convert the output sequence to 3GP. The main supported formats are, among others, MP3, OGG, WAV and 3GP so that they can be played on mobile devices and tablets.
Is it free?
Yes, this is a free software that can be downloaded from the Microsoft Store.