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MP3 to M4A converter

Turn MP3 files into M4A in your browser. Nothing is uploaded.

Runs in your browserNo sign-upNo watermark

Your files never leave your device.

Quick answer

To convert MP3 to M4A, drop your MP3 files in and press Convert. The conversion runs in your browser tab, so your audio is never uploaded.

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How to convert MP3 to M4A

  1. Drop your MP3 files onto the box, or press Choose files.
  2. Pick a quality. 192 kbit/s is a good everyday choice; 320 is the best you can get for music.
  3. Press Convert. A progress bar shows how far along it is.
  4. Download your M4A file, or all of them as a ZIP.

MP3 is the most widely supported audio format. It plays on every phone, car stereo and music app, and its lossy compression keeps files small. M4A is AAC audio in an MP4 wrapper, the format Apple devices and iTunes use. It usually sounds a little better than MP3 at the same size.

Common questions

Why convert MP3 to M4A?

MP3 is the most widely supported audio format. It plays on every phone, car stereo and music app, and its lossy compression keeps files small. Convert to M4A when you need a file that works on the device or app you are using, or when you want a smaller file. M4A is AAC audio in an MP4 wrapper, the format Apple devices and iTunes use. It usually sounds a little better than MP3 at the same size.

Will the sound quality drop?

Going from one lossy format to another loses a little more each time. Use the highest bitrate you are comfortable with, and keep the original file.

Is my audio uploaded anywhere?

No. The conversion happens inside your browser tab, so your audio never leaves your device. We cannot see it or keep a copy.

Can I convert many files at once?

Yes. Drop several files in and they are converted one after another. When they finish you can download each one, or all of them together as one ZIP.

Why was the first conversion slow to start?

The first time you convert audio or video, your browser downloads the conversion engine (ffmpeg, about 30 MB) from a public CDN. After that it is cached, so the next ones start straight away. Your files are not part of that download.

How big a file can I convert?

Everything runs in your browser's memory, so the limit is your device. We suggest about 500 MB on a computer and 100 MB on a phone. Beyond that, the tab may slow down or run out of memory. A computer is much faster than a phone.