Convert MP3 to M4A
Some apps and forms ask for an M4A instead of an MP3. Convert it here, on your own computer, without uploading the file.
- Never uploaded
- No size limit
- No sign-up
- Free
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Quick answer: To convert MP3 to M4A, drop the MP3 into the tool at the top of this page and press "Convert to M4A". It happens in your browser, so the file is never uploaded. It is free, with no sign-up and no file size limit. The sound does not get better: both are compressed, so convert only if something asks for M4A.
Updated
How it works
- Drop your audio fileMP3, WAV, FLAC, OGG and more. It stays on your computer.
- ConvertYour sound is saved as an M4A, or copied as it is where it already fits.
- Download the M4APlays in Apple Music, on iPhones and in most players.
It does not improve the sound
MP3 and M4A are both compressed formats. Converting from one to the other cannot bring back detail already lost, and it can lose a little more. Do it when an app or form needs M4A, not to improve quality.
Size
Our 20-second MP3 became a 320 KB M4A. That is close to the size of the MP3, not a big saving. To make a file much smaller, see compress MP3.
Measured, not promised
Measured on 21 Oct 2026 in Chrome on a 2019 Intel MacBook (an older laptop) with a 20-second sample. Newer computers are faster; real files vary. More results.
Why your audio never leaves your computer
Your audio is converted by your own computer, inside this tab, and never uploaded. That is why there is no length limit and no sign-up. How it works.
Questions
Can I go back to MP3?
Yes: M4A to MP3.
Does it work for WAV?
Yes: WAV to M4A has a page of its own.
Can I convert several files at once?
Yes. Choose or drop several files together. They are converted one after another with the same settings, and you can download each one or all of them in one ZIP.
Is my file uploaded?
No. It is converted inside this browser tab and saved straight back to your computer.
Can I use a video file?
Yes. Drop a video and you get its sound.