MP4 to M4A converter

Keep the exact original audio of a video in an Apple-friendly file for iTunes, iPhone ringtones or podcast apps.

Drop a MP4 file hereThe converter loads in your browser.

What happens to your MP4

AAC audio is copied out of the MP4 without re-encoding: identical quality, done in seconds.

Tip: For an iPhone ringtone, trim to under 40 seconds first and rename the file to .m4r.

How to convert MP4 to M4A

  1. Drop your MP4 file on the box above, or tap it to pick one. The engine (about 31 MB) loads once per visit.
  2. The converter reads the file's streams and shows which codecs are inside.
  3. Pick a bitrate, or leave the default to keep the original audio when possible.
  4. Press the button, wait for the progress bar, then download your M4A.

Prefer the command line?

This is the FFmpeg command the converter runs for a typical MP4 (h264 + aac). Paste it into a terminal with FFmpeg installed for batch jobs or files too big for a browser tab:

ffmpeg -y -i input.mp4 -vn -sn -c:a copy output.m4a

Streams are copied (-c copy), so this runs at disk speed. Your own file may contain different codecs; the converter above detects them and adapts. For other jobs, ask the FFmpeg command helper.

Questions

Is M4A the same as MP4?

It is the same container family, holding audio only. The .m4a extension tells players to treat it as music.

Is my MP4 file uploaded?

No. The MP4 is read from your device by FFmpeg running as WebAssembly in the page, and the M4A is written back to your device. No server ever receives it.

Is there a size limit for MP4 to M4A?

We set none. The practical limit is browser memory: roughly 2 GB of output on a computer, and much less on phones.