Convert MP4 to M4A
Turn MP4 files into M4A in seconds. Up to five at a time, private and free.
1 · Choose your files
Drag & drop audio or video files here, or click to browse
Up to 5 MP4 files, max 200 MB each
2 · Pick the output
All processing runs on your own device with ffmpeg compiled to WebAssembly; nothing is uploaded.
3 · Collect your files
Results appear here with a player. Download them one by one or grab everything as a ZIP.
How to convert MP4 to M4A
- Drop your MP4 files into the box above, or click it to browse.
- M4A is already selected as the output. For lossy formats, 192 kbps is a good balance between size and quality.
- Click Convert to M4A, then download each result or grab them all as a ZIP.
About the MP4 format
MP4 is the universal video container: phones record it, every site streams it and every device plays it. Its soundtrack is usually AAC audio. When only the sound matters, a lecture, a concert recording or a podcast published as video, extracting it to an audio file saves most of the space.
About the M4A format
M4A is the audio-only MP4 container, almost always carrying AAC audio. It is Apple's native format (iTunes, Apple Music, iPhone ringtones) and sounds better than MP3 at the same bitrate. Every modern device plays it.
Frequently asked questions
Why convert MP4 to M4A?
M4A (AAC) sounds better than MP3 at the same bitrate and is the native format of Apple devices. An MP4 video is many times larger than its soundtrack and cannot be played in audio-only apps.
Does converting MP4 to M4A lose quality?
M4A uses lossy compression, so a little detail is discarded to make the file smaller. At 192 kbps or higher the difference is inaudible for most listeners; choose 320 kbps for the safest result.
What happens to the video?
Only the soundtrack is kept. The MP4 file's picture is dropped and you get a plain M4A audio file, which is exactly what you want for music, lectures or podcasts recorded as video.
Which bitrate should I choose?
192 kbps is transparent for most music and the default here. Use 320 kbps to archive or for critical listening, and 128 kbps for speech, where the difference is inaudible and the file is a third smaller.
How much smaller will the M4A file be?
A lot. MP4 stores far more data than M4A needs: a typical song shrinks by 80 to 90 percent at 192 kbps.
Can I convert several MP4 files at once?
Yes. Add up to 5 files of up to 200 MB each, convert them in one go and download the results one by one or as a ZIP.
Are my files uploaded?
No. The conversion runs in your browser with ffmpeg compiled to WebAssembly. Your MP4 files never leave your device.
Is this MP4 to M4A converter free?
Yes, completely, with no sign-up and no watermark. The site is supported by ads.
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