A free app for Android, by The AppGuru.

If you are looking for an app that can help you convert MP3 files into WAV format, then you are in the right place. This app is an audio format recorder and converter. It supports conversion to a variety of audio formats, including wav, aac, amr, flac, ogg, opus, and wma.

This is very simple and easy to use. It works fast, so it will only take a few minutes to complete conversions. With this, you can also convert multiple files at once. Before converting a file, you can customize its output, including its bit rate, sampling rate, and channel.