Updated June 2026 · runs 100% in your browser
M4A to MP3
Convert M4A (AAC) audio to MP3 on your device. No upload, no sign-up, no limits.
Drop M4A files here
or click to choose
🔒 Processed on your device · 0 bytes uploaded
First file loads the converter engine (~25 MB) — cached after that.
How it works
ConvertCabin loads a local copy of FFmpeg in this browser tab and converts on your device — nothing is uploaded. The first file downloads the engine (~25 MB), then it's cached.
It stays free, unlimited and private, and works offline once loaded.
About M4A to MP3
M4A is common on Apple devices; MP3 plays everywhere.
Frequently asked questions
How do I use M4A to MP3?
Drop M4A files and download the MP3s.
Is my file uploaded?
No. It is converted on your device by a local copy of FFmpeg and never uploaded.
What is an M4A file?
M4A is an audio format that usually holds AAC-encoded sound, used by Apple Music and iTunes. It offers better quality than MP3 at the same size but slightly less universal support.
What is an MP3 file?
MP3 is the most widely supported audio format. Its lossy compression shrinks audio to a fraction of the original size while keeping it perfectly listenable, which is why it became the standard for music.