Beyond being a universal player, VLC has a built-in "Convert/Save" feature that extracts audio from MP4 files easily. It is completely open-source and ad-free.

Below are the most trusted tools available for various operating systems:

A favorite for content creators, CapCut allows you to import MP4s, extract the audio, and export it directly as an MP3, WAV, or FLAC.

A dedicated, lightweight tool designed for simplicity. It supports drag-and-drop and can convert multiple files simultaneously.