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Choose the MP4
Drop the video on the box above, or tap it to pick a file.
Convert MP4 to M4A for Free
Convert MP4 to M4A with the sound copied as it is: no re-encoding, no upload.
Last updated
- Free, no sign-up
- Never leaves your device
- Works on your phone
How do I know the MP4 to M4A conversion was lossless?
To convert MP4 to M4A for free, choose the MP4 above, keep M4A selected, and select Extract audio. An AAC soundtrack is copied as it is, so nothing is lost. After you convert MP4 to M4A, the result says whether the audio track was copied as it is or converted. A copied track is the exact sound inside the MP4. Play it on this page before you download it.
Copied: the original sound
Phones, cameras, and most editors put AAC sound in MP4. That track goes into the M4A untouched.
Converted: a different codec inside
If the MP4 holds MP3 or Opus sound, it is encoded to AAC. The result tells you when that happened.
Why convert MP4 to M4A?
M4A is the audio-only form of MP4. Converting MP4 to M4A drops the picture and keeps the sound as it was, in a file a fraction of the size.
Keep the exact sound, smaller
No second lossy step. The M4A is the soundtrack that was already inside the video.
Use it in Apple apps
GarageBand, Music, and Voice Memos all open M4A directly.
Upload just the audio
A transcription or podcast tool gets the same sound in a file that uploads in seconds.
Clean the voice first
If the soundtrack has wind or traffic, clean it before you share it.
Remove background noise from audioShould I convert MP4 to M4A, MP3, or WAV?
Pick M4A unless an app needs something else. It is the only one of the three that can keep the original sound with no change.
| Compared on | M4A | MP3 | WAV |
|---|---|---|---|
| What happens to AAC sound | Copied as it is | Re-encoded at 192 kbps | Decoded to uncompressed audio |
| Size for 10 minutes | Same as the soundtrack, often 10 to 20 MB | About 14 MB | About 115 MB at 48 kHz |
| Best for | Keeping and sharing on Apple devices | Older players and upload forms | Editing and noise removal |
Why use EraseNoise for this?
It copies the soundtrack out of the video and hands it back, with nothing added.
No re-encoding
When you convert MP4 to M4A here, an AAC track is moved into the M4A packet by packet, so there is no generation loss at all.
Nothing is uploaded
The browser reads the MP4 and writes the M4A. Private video stays on your device.
Done in seconds
Copying is not encoding. Even a long video converts about as fast as the file can be read.
Free with no account
No sign-up, no watermark, and no daily cap.
Why does it finish in seconds?
Most tools that convert MP4 to M4A upload the video and encode the sound again. Here the sound is copied and nothing travels.
No upload
Online tools that convert MP4 to M4A upload the video first. Here a 2 GB video is read from your disk, not sent anywhere.
No encoding
When the sound is AAC, the packets are copied, which takes seconds.
Works on a phone
Pick the clip from your library in Safari or Chrome and save the M4A to Files.
Which videos can I convert to M4A?
Convert MP4 to M4A, or MOV, M4V, and WebM, for files up to 2 GB.
MP4 and MOV with AAC sound
iPhone, Android, GoPro, Zoom, and editor exports. These copy with no re-encoding.
WebM screen recordings
WebM holds Opus sound, so it is encoded to AAC. If your browser cannot encode AAC, the page says so; pick MP3 instead.
MKV from OBS
Remux it to MP4 first in OBS with File, Remux Recordings.
Files you are allowed to use
This page converts video files on your device. It does not download from websites.
How to convert MP4 to M4A
- 2
Keep M4A selected
M4A is picked for you, which copies AAC sound as it is.
- 3
Extract and download
Select Extract audio, check whether it says copied, play it, and download.
Who keeps the sound of an MP4 as M4A?
A podcaster recording on Zoom
Convert the MP4 recording to M4A and drop it into the editor with the original sound intact.
A musician saving a rehearsal
The phone video of a practice becomes an M4A for GarageBand, with no quality lost.
A researcher with interview footage
Send M4A files to the transcriber instead of gigabytes of video.
What to do after you convert MP4 to M4A
After you convert MP4 to M4A, the file is the original sound. Here is where to take it next.
| Job | Use |
|---|---|
| Wind, fan, traffic, or hum | Remove background noise from audio |
| Edit it in a DAW | Convert video to WAV |
| An app only takes MP3 | Convert M4A to MP3 (free) |
| The voice is quiet | Normalize audio (free) |
| Join several recordings | Merge audio (free) |
Is my MP4 uploaded?
No. To convert MP4 to M4A, EraseNoise reads the video in your browser and writes the M4A there too. Nothing is sent to a server or stored. Refreshing the page clears the result, so download it before you leave.
Frequently asked questions
How do I convert MP4 to M4A for free?
Open this page, choose the MP4, keep M4A selected, and select Extract audio. Your browser does the work, so it is free, needs no account, and adds no watermark.
Is converting MP4 to M4A lossless?
Yes when the MP4 has AAC sound, which is what phones, cameras, and Zoom record: the track is copied without re-encoding. The result says copied when that happens.
What is the difference between MP4 and M4A?
They are the same container. MP4 usually holds video and sound; M4A is the name used when it holds sound only.
Is my video uploaded?
No. The MP4 is read and the M4A is written in your browser. Nothing is sent to EraseNoise or anyone else.
Why did it say converted instead of copied?
The video’s sound was not AAC, for example Opus in a WebM, so it was encoded to AAC. If your browser cannot encode AAC, the page shows an error; pick MP3 instead.
Can I just rename .mp4 to .m4a?
Some players accept that, but the file still carries the picture and stays large. Converting MP4 to M4A here drops the video track properly.
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Increase video volume
Make a quiet video louder, picture untouched
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Remove static & hiss
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Convert MP4 to M4A on this device
Choose one video. The sound is copied as it is, and nothing leaves your phone or computer.
Choose an MP4