MP3 to M4A
Drop an MP3 and we'll re-encode it as M4A (AAC) — the format iTunes, iPhone, and ringtone tools expect.
drop your MP3 here
or click to pick a file.
How it works
Your browser already decodes audio. We pair that with a tiny encoder (pure JavaScript for M4A, or a slim WebAssembly codec for less common formats) and put it behind a drop target. The whole pipeline runs in your tab. The first conversion may take a moment to load the codec; after that it's instant and cached.
Why convert MP3 files
MP3 files are great for some workflows and frustrating for others. M4A fixes the common compatibility headaches without losing what matters about your audio.
FAQ
Is the converter free?
Yes — no signup, no daily limit, no watermark.
Does my file get uploaded?
No. The conversion runs in your browser. Open this page, switch to airplane mode, drop a file — it still works.
Can I convert multiple files?
Yes, drop several at once and you'll get a zip back.
How big can the file be?
Around 500 MB on a typical laptop. Past 1 GB the browser starts running out of memory.