Step 1. Download and install the MP3-to-MP4 audio converter
The first step of using Movavi's MP3-to-MP4 converter is to download the program to your device. You can download both the Windows and Mac versions of the program from the official Movavi site. So, make sure to download the correct file for your platform, such as the MP3-to-MP4 converter for a Mac and the Windows version if you're on Windows. Then, launch the installer and follow the on-screen instructions to set up the program.