A free app for Android, by Sennikpro.

This is a great app that lets you quickly convert one format to another. You can choose from 16 different formats, so there’s no need to worry about compatibility. The app is based on quality and provides the best possible output. It’s simple to use and very intuitive, so you won’t have any problems converting your audio files.

How to use the app:

Open the app. Select the audio file you want to convert. Choose the output format you want to convert to. Press the convert button and wait for the conversion to finish. Once the conversion is done, you can find the converted file in the converted folder.