How can I convert m4a to mp3 on my mac?

Play -- This is a music player from a solo developer in Poland that has a secret conversion function. It has less than 1000 downloads ever, and the conversion feature isn't documented.

How to use it if you are looking for a M4A to MP3 converter for Mac:

1. Open Play

2. Drag M4A files into its window

3. Right-click any file → "Export as..."

4. Select MP3

5. The developer (sbolotov on GitHub) just added this as a personal feature and never told anyone

By the way, Permute is now a paid M4A to MP3 converter for Mac, but version 1.0 (from 2012) was freeware for a short period.

What it is: A drag-and-drop converter

Why it's obscure: Version 1.0 was only free for 2 months in 2012 before they started charging

How to find it: Old MacUpdate downloads, version 1.0.1

The catch: It's 32-bit only, so it won't work on macOS Catalina and later