WonderFox HD Video Converter Factory Pro is the best MKV file to MP3 converter that is highly recommended by experts and users. It enables you to convert MKV video to MP3 audio with high quality preserved and freely recode any other type of video or audio file format. For instance, you can use it to convert FLAC to MP3, MKA to MP3, MP4 to MP3, and so on. This full-featured converter MKV to MP3 can not only convert video & audio, but also allows you to edit files like merging and cutting, join videos, download videos from YouTube, Facebook, Dailymotion and other 1000+ sites.
Below are the specific conversion steps. Install the converter for preparation.