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MP3 to M4A Converter

Convert MP3 audio into an M4A (AAC) file — smaller at the same quality.

To convert MP3 to M4A, add the file and it is re-encoded to AAC inside an MP4 container using ffmpeg compiled to WebAssembly, running in your browser. AAC is a more efficient codec than MP3, so the result is usually smaller at comparable quality. Note that this is a re-encode, not a re-wrap — going from one lossy format to another always loses a little.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Will quality improve?

No. Converting between two lossy formats can only lose information — the detail MP3 discarded is gone and AAC cannot invent it. Convert for compatibility or file size, never for quality.

How to use the mp3 to m4a converter

  1. 1Select your mp3 file — the file stays on your device and is never uploaded.
  2. 2Choose the bitrate.
  3. 3Press Run, then download the result when it is ready.

Embed this tool

Put the working mp3 to m4a converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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