Convert MP4 to M4A
The audio track lifted out of the video untouched — often a perfect copy, made privately on your device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
M4A is MP4's audio-only sibling — same container, same AAC audio, no video. That kinship makes this the cleanest audio extraction there is: when the MP4's track is AAC (nearly always), the tool copies it into the M4A bit-for-bit, with zero re-encoding and zero quality loss, in about the time a file copy takes.
The result drops straight into Apple's world — Music, iMovie, GarageBand, iPhone playback — and most modern Android and Windows software besides. If universal compatibility matters more than perfect fidelity, MP3 is the alternative; if keeping the original quality matters, this is the extraction to use.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
Is MP4 to M4A really lossless?
When the video's audio is AAC — the overwhelmingly common case — yes: the track is copied, not re-encoded, so the M4A holds the identical audio data. The result panel says so when a copy happened.
When should I pick M4A over MP3?
Pick M4A to keep the original quality perfectly and stay in the Apple ecosystem. Pick MP3 when the file must play on old car stereos, cheap players, or software from another era — universality is MP3's specialty.
Why is the extraction so fast?
Because nothing is being converted in the usual sense — the audio stream moves from one container to a near-identical one. The time spent is reading and writing the file, not processing audio.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.