MP4 to MP3 Converter: Pull the Audio Out of Any Video with Convertavo
Only want the sound from a video, like a lecture for the bus or a song from a concert clip? Convertavo's free MP4 to MP3 converter keeps the audio and drops the picture. Upload the video, pick the quality, and download your MP3, usually in under a minute.
Your files stay private
Uploads are deleted from our servers one hour after processing. Nothing is read or reused, and nothing is kept unless you save it to your account.
No account required
20 free credits a day, with no email address and no watermarks on the output.
Runs on any device
Works in any modern browser on Windows, macOS, Linux, Android and iOS.
How to convert MP4 to MP3
Most videos are done in 20 to 60 seconds.
- STEP 01
Upload your video
Drop it in, or paste a link to it. A WhatsApp clip goes in as it is, and bigger files can be up to 25 MB, or 100 MB on a free account.
- STEP 02
Set the audio quality
192 kbps is already picked, and it is plenty for speech and most music.
- STEP 03
Extract and download
Click Extract audio and save the MP3 to your phone or computer.
The MP3 plays on any phone, car stereo, speaker or computer.
What the MP4 to MP3 tool does
Sound only
The picture is dropped and the soundtrack is saved as an MP3 that plays anywhere.
Three quality levels
Talks sound fine at 128 kbps. We'd use 192 for most music and keep 320 for the songs you really love.
Any common video
MOV, MKV and AVI go in just like MP4, so iPhone videos work as they are.
What can I turn into an MP3?
Any video where the sound is the part you care about. The ones we see most are a lecture to listen to on the way to work, a song from a concert a friend filmed, a podcast that was recorded on camera, and a voice note someone sent as a video.
MOV, MKV and AVI work as well as MP4, so an iPhone video doesn't need converting first. Only convert videos you made, or ones you have the right to use.
What's the best MP3 quality to choose?
The bitrate is how much sound data goes into each second. A higher number sounds better and takes more room. These sizes come straight from the sum: kilobits per second times seconds, divided by eight.
| Bitrate | Best for | Size per minute |
|---|---|---|
| 128 kbps | Speech, lectures and podcasts | About 0.96 MB |
| 192 kbps (recommended) | Music and everyday listening | About 1.44 MB |
| 320 kbps | Music you really care about, the highest MP3 quality | About 2.4 MB |
Swipe the table sideways to see every column.
A one-hour lecture is about 58 MB at 128 kbps and 86 MB at 192. We wouldn't go to 320 for a phone video, though. A higher bitrate can't add sound the video never had, and 192 already catches everything a phone recorded.
Should I pick mono or stereo?
We keep music on stereo. In a concert clip, that's what puts the guitar in one ear and the crowd in the other. A lecture filmed on a phone usually has nearly the same sound on both sides anyway, so mono loses nothing there.
Switching to mono won't shrink the file here, though. A three-minute song at 192 kbps comes to about 4.3 MB either way, since the bitrate is what sets the size. For a lighter file, 128 kbps is the setting to change.
Is Convertavo's audio extractor free?
Yes. Each file uses 10 credits and you get 20 free credits a day, so that's two free MP3s daily without an account, and five with a free one. No email, and no watermark. Standard plans and above also get priority processing.
What happens to my video?
It goes over a secure HTTPS connection and is deleted from our servers one hour after processing. We don't keep it, watch it or reuse it.
Does it work on my phone?
It does, in any modern browser on Android, iOS, Windows, macOS and Linux, with no app needed.
Got a video where only the sound matters? Drop it into Convertavo above and take the audio with you.
Extract audioCommon questions about extracting audio
What people ask us most about turning video into MP3.
How do I convert MP4 to MP3?
We rarely change anything. The bitrate already sits at 192 kbps, so it's Extract audio, then download.
What is the best MP3 quality?
320 kbps is the highest MP3 quality, and worth it for music you care about. A lecture filmed on a phone sounds no different to most ears at 128, and the file is less than half the size.
Can I extract only part of the audio?
Not yet, the whole soundtrack goes into the MP3. If you only want one song from a concert, a free audio editor can cut it down afterwards.
Can I convert MOV or MKV to MP3?
Yes. An iPhone MOV goes in exactly like an MP4 does, and so do MKV and AVI files.
How big will my MP3 be?
A four-minute song at 192 kbps is about 5.8 MB. The same song is 3.8 MB at 128 and 9.6 MB at 320.
Is it free?
Yes. There are 20 free credits a day and each file uses 10, with no signup and no watermark.
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