Part 2. Best YouTube to MP3 converter to convert YouTube video to MP3. Wondershare UniConverter (originally Wondershare Video Converter Ultimate) is a top-notch tool that converts virtually all types of media file formats. They include MP4, MP3, MOV, M4A, WMA, and FLV, as well as device formats among others. The amazing program is popular for I was under the impression you could just switch the file extension from "MP4" to "MP3". You should be able to do that with VLC. For multiple files you can write (read: copy, paste, edit, save) a batch file to do multiples for you. I know this is listed as solved, but I also wanted to recommend the Free Studio suite. First of all, choose or make drag and drop of mp4 format video file that you want to convert into mp3 audio format. Step 2: Now, press “Convert”. Step 3: Finally, your converted mp3 audio track is ready to download. Just press “Download” and save mp4 as mp3 online. Paso 3: Selecciona el formato de salida (MP3) Ahora que has seleccionado los archivos MP4, debes elegir el formato de salida. En este caso, selecciona MP3. Generalmente, encontrarás esta opción en un menú desplegable o haciendo clic en un botón que diga «Convertir a» o «Perfil». bx7Pxw.