Convert MOV to M4A
Take the audio out of a QuickTime MOV as an M4A without re-encoding it. An iPhone records AAC inside a MOV, and an M4A is an MP4 container holding an AAC track — so the audio moves across untouched. For a voice memo filmed as video, or an interview recorded on a phone, this gives you exactly what the microphone captured.
Use this without the search next time. Prathom Workbench puts Prathom's tools in your toolbar.
Add to Chrome — freeDrop your MOV file here, or click to browse
Up to 50 MB. Deleted automatically after 30 minutes.
What it does
- The AAC track is copied, not re-encoded
- Bit-for-bit identical to what the phone recorded
- Plays natively on every Apple device
- No watermark and no sign-up
How to use MOV to M4A
- 1
Add the MOV
Drop it in or choose it from your computer. Files up to 50 MB, and no account is needed.
- 2
Convert
The video is discarded and the AAC track is copied into an M4A container, without decoding or encoding.
- 3
Use it
The M4A opens in Apple software, podcast editors and anything else that reads AAC.
Phone video that was always about the sound
A great deal of what people film was recorded for what was said rather than what was seen. Interviews, lectures, a doctor explaining something, a rehearsal, a noise a car is making. The camera ran because that is what a phone does.
Extracting that audio is the common case, and doing it without re-encoding is the difference between keeping the recording and keeping a copy of it.
How it works
The video track is discarded and the AAC audio track is copied into an M4A
container with -c:a copy. No decoder and no encoder run, so the operation is
bounded by reading the file rather than by its length.
The source is probed first, because the copy is only valid when what is inside really is AAC. A camera writing uncompressed audio falls back to a re-encode automatically.
Renaming will not do it
This comes up because M4V to MP4 often works by renaming, and people reasonably try the same here. It does not: MOV and MP4 descend from the same design but are not the same container, and software that expects one frequently refuses the other outright.
What is true is that the audio inside needs nothing done to it. The remux moves it into a structure the destination will open, and takes about a second.
Where the M4A goes
Podcast software handles AAC natively and prefers it. Apple devices play it without a thought. Most modern editors import it directly.
If the file is going somewhere you cannot check — an old car, a colleague's laptop, a service with a fixed format list — convert to MP3 instead. It is worse audio and it is refused by nothing, and for spoken word the difference is not something anyone will hear.
Where the recording quality was actually decided
It is worth being clear about what a lossless extraction does and does not give you. It preserves exactly what the phone captured. It does not improve it, and the phone's own decisions were made before you pressed record.
An iPhone records AAC at a bitrate chosen for storing hundreds of clips, not for a studio. More importantly, the microphone was wherever the phone was — and the distance between a phone on a table and the person speaking is the single largest factor in how usable the recording turns out to be.
Extracting the audio untouched is the right thing to do because it wastes nothing. It is not a way to rescue a recording made from across a room.
Keep the MOV if the video matters
The M4A holds the sound and nothing else. If there is any chance the pictures will be wanted — a demonstration, a person pointing at something, a scene you might want later — the MOV is the only copy that has them, and it is not large by modern standards. Extract the audio, use it, and leave the original alone.
Examples
An interview filmed on an iPhone
Phones record video even when the conversation was the point. This keeps the audio exactly as captured and drops the part nobody will watch.
A rehearsal recording for editing
Musicians film practices to listen back. An untouched track is the right thing to hand an editor — the edit then starts from the recording.
Frequently asked questions
Does an iPhone recording really stay untouched?
Yes. Recent iPhones record AAC audio inside a MOV container, and M4A is that same AAC in an MP4 container. Moving between them is a copy, so the audio in the result is the audio the microphone produced — no encoder runs at any point.
Why not just rename the file?
Because the container genuinely differs: a MOV and an MP4 are close relatives but not the same structure, and software that expects one will often refuse the other. Renaming works for M4V to MP4, where the contents are the same shape. Here a real remux is needed, and it takes about a second.
What if the MOV came from a camera rather than a phone?
Professional cameras sometimes record uncompressed or high-bitrate audio that an MP4 container cannot hold. In that case the audio is re-encoded to AAC automatically and you get a valid M4A one generation removed. It is rare, and there is nothing to choose.
Is M4A better than MP3 for this?
For an Apple recording going to Apple software, clearly yes: it is lossless here and MP3 is not, and both play natively. MP3 is the answer when the file has to work on equipment you do not control, which is the only thing it is better at.