Skip to content
ClipTools
MP3M4A

Convert MP3 to M4A

This free MP3 to M4A converter changes your MPEG-1 Audio Layer III (.mp3) file into a MPEG-4 Audio (.m4a) file, right in your browser. There is nothing to install, no account to create, and no limit on how many files you convert.

100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

Share this tool

The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. M4A is best for Apple Music and efficient playback, which is the usual reason to convert from MP3.

Why convert MP3 to M4A?

  • Note: M4A has narrower support than MP3 - convert only when a specific app or workflow needs it.
  • At a sensible bitrate, M4A stays close in size to MP3 while changing the codec.
  • Pick M4A when you need a file made for Apple Music and efficient playback.

MP3 vs M4A

PropertyMP3M4A
Full nameMPEG-1 Audio Layer IIIMPEG-4 Audio
ContainerMP3MPEG-4
Typical codecMP3AAC
CompatibilityUniversalWide
LosslessNoNo
Best forUniversal music and podcast playbackApple Music and efficient playback

How to convert MP3 to M4A

  1. Add your MP3 file

    Drag and drop your .mp3 file onto the upload area, or click to browse and pick it from your device.

  2. Start the conversion

    Click "Convert to M4A". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.

  3. Wait a few seconds

    A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.

  4. Download your M4A file

    When it finishes, download the .m4a file straight to your device.

Frequently asked questions

Is this MP3 to M4A converter free?
Yes. It is completely free with no signup, no watermark, and no limit on how many files you convert. It is supported by ads, which keeps the conversion itself free.
Are my files uploaded to a server?
No. The conversion runs locally in your browser using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is processed in memory on your own device and is never uploaded, stored, or seen by anyone.
Will I lose quality converting MP3 to M4A?
The audio is re-encoded to M4A, which is lossy. At a sensible bitrate the difference is hard to hear, but converting back and forth repeatedly will degrade quality.
Will the file get smaller or larger?
Roughly the same. MP3 and M4A have comparable size profiles at a sensible bitrate.
What is the difference between MP3 and M4A?
MP3 is MPEG-1 Audio Layer III (an MP3 container, typically MP3); M4A is MPEG-4 Audio (an MPEG-4 container, typically AAC). M4A is best for Apple Music and efficient playback, while MP3 is best for universal music and podcast playback.
How long does the conversion take?
Most files finish in a few seconds to under a minute, depending on length and your device. The first conversion is a little slower while the engine downloads and caches, then later runs start instantly.

Related conversions

WAV → M4AAAC → M4AMP3 → WAVMP3 → AACMP3 → OGG

Need more formats or options? Use the full Audio Converter.