Convert MP4 to M4A
Convert MP4 files to M4A entirely in your browser — no upload, no account, no watermark.
Your file never leaves your device — conversion runs entirely in this browser tab.
To convert MP4 to M4A, open the M4A converter and drop your MP4 file in. The conversion runs entirely inside your browser using WebAssembly, so the file is never uploaded. The best-kept secret of audio extraction: because MP4 already contains AAC, the audio can be copied straight out with no re-encoding at all.
What to expect from this conversion
The best-kept secret of audio extraction: because MP4 already contains AAC, the audio can be copied straight out with no re-encoding at all. Completely lossless, nearly instant, and better than converting to MP3.
The universal container, normally holding H.264 and AAC. Plays essentially everywhere.
Lossy · video
AAC audio in an MP4 container. Apple’s standard audio format and the audio you get from most video files.
Lossy · audio
Both MP4 and M4A discard data to save space, so this conversion compresses something that has already been compressed. Always convert from your original file rather than from an earlier conversion — the losses compound.
How to do it
- Open the M4A converter
Go to the M4A converter and drop your MP4 file onto it, or click to browse.
- Convert
Press Convert. FFmpeg runs in your browser and shows real progress as it works.
- Download
Download the finished M4A file. It is created in your browser and never sent anywhere.
Common questions
How do I convert MP4 to M4A?
Open the M4A converter, drop your MP4 file onto it and press Convert. Everything runs in your browser — the file is not uploaded. Desktop browsers handle files up to about 200MB; mobile browsers about 40MB.
Does converting MP4 to M4A lose quality?
Yes, some. Both MP4 and M4A are lossy, so this is a second compression pass over data that was already compressed. The loss is usually modest, but always convert from your original rather than from a previous conversion.
Is it free to convert MP4 to M4A?
Yes, with no account, no watermark and no daily limit. The processing happens on your device rather than on a server, so there are no per-conversion costs to pass on.
Are my files uploaded when converting MP4 to M4A?
No. FFmpeg runs as WebAssembly inside your browser tab. The file is read from your disk, processed in memory and written back out — it never reaches a server.