Take the audio out of a video
without giving it away.
Convert MP4, MOV, MKV or WebM to MP3 — or copy the original audio track out untouched, which is faster and loses nothing. It runs in your browser, so the video is never uploaded, and it tells you what the audio actually is before you choose a quality.
Drop a video here
MP4, MOV, MKV, WebM, AVI and more. Up to 500 MB. The file stays on your device.
The conversion runs in this tab and the file is never uploaded. Use it on recordings you made or have permission to use.
Why this one
It tells you what you actually have
Before you choose anything, it reads the file and says what the audio inside it is — "128 kbps AAC", say. Every other converter offers 320 kbps as though it were an upgrade. If your source is 128, a 320 kbps MP3 is two and a half times the size and cannot sound better.
Or take the audio untouched
Most videos already contain a perfectly good audio track. Copying it straight out means no re-encoding, no second generation of quality loss, and a smaller file. On a 55-minute video that took about a second, against 34 seconds to encode the same thing to MP3.
Just the part you need
One song out of a long recording, one section of a lecture. Set a start and an end and only that part is converted — which is also far quicker than doing the whole file and trimming afterwards.
Nothing is uploaded
The conversion runs in your browser using a full build of FFmpeg compiled to WebAssembly. Your video never leaves the device, there is no queue, and there is no copy of it on anybody's server — including ours.
MP3, WAV, or the original
MP3 at 128, 192, 256 or 320 kbps for something that plays anywhere. WAV when you need uncompressed audio for editing. Or the original track rewrapped as-is, usually .m4a.
Hear it before you download it
The result plays right there on the page. Ten seconds of checking beats getting the wrong track home and starting again.
Why the highest quality is usually the wrong choice
The audio inside a video has already been compressed once. A typical MP4 carries around 128 kbps of AAC — good enough that most people never notice, and permanently missing the detail the encoder discarded to get there.
Converting that to a 320 kbps MP3 does not recover any of it. The result is roughly two and a half times the size of the audio it came from and sounds, at best, identical. Every converter in this category offers 320 kbps at the top of a list and lets people assume it means "best". It means "largest".
So this one reads your file first and says what it found. The recommended setting is one step above the source — enough headroom that the second encode does not audibly degrade it, without paying for space that buys nothing. And if you do not need MP3 specifically, Original audio skips the question entirely: the existing track is copied out as it is, with nothing re-encoded at all.
If you want the reasoning in full — what bitrate actually is, the real difference between MP3, M4A and AAC, and when copying beats converting — it is in how to extract audio from a video. Need the video itself to be smaller instead? The video compressor does that, and the rest of the set is on the tools page.
Questions
How do I convert an MP4 to MP3?+
Drop the MP4 onto this page, choose MP3 and a quality, and press convert. The file is read and converted inside your browser and downloads straight back to you — there is no upload, no account and no waiting in a queue.
Can I convert a MOV file from my iPhone to MP3?+
Yes. MOV files from an iPhone or a camera work exactly the same way as MP4 — drop one in and it is handled identically. So are MKV, WebM, AVI, M4V and most other things a phone or camera produces, because the tool uses a full build of FFmpeg rather than whatever formats a browser happens to support.
What bitrate should I choose?+
One step above whatever the video already contains, which is what the tool recommends once it has read your file. Re-encoding audio to a higher bitrate than it was encoded at cannot restore detail that was thrown away the first time — it only makes the file bigger. Most video carries 128 kbps audio, so 192 kbps is usually the right answer and 320 kbps is usually a waste of space.
What does 'Original audio' do, and is it better than MP3?+
It copies the existing audio track out of the video without re-encoding it, usually producing an .m4a file. It is faster, it is smaller, and it is the only option here that loses nothing at all, because nothing is re-compressed. Choose MP3 instead when you need a file that plays on absolutely anything, such as older car stereos.
Is my video uploaded to a server?+
No. FFmpeg is compiled to WebAssembly and runs inside the browser tab, so the video is read from your disk, converted on your own machine, and handed back. It never travels anywhere. That is also why there is no limit on how many files you convert: they cost us nothing to process.
How long does it take?+
Measured on a desktop: a 55-minute video took about 34 seconds to convert to MP3, and about one second to copy its audio out untouched. Copying does not get slower with length, because nothing is re-encoded. A phone is slower than a laptop for the same reason it always is, and the page shows progress either way.
Is there a file size limit?+
About 500 MB. The work happens in a browser tab and a tab has a memory ceiling — past roughly that size the tab is killed by the operating system, which would waste the whole wait. Larger files than that are genuinely a job for a desktop application. Files above 250 MB are read from disk as they are needed rather than loaded in one go, which is slower but survives on a phone.
Can I download audio from YouTube or Spotify with this?+
No, and it is not an oversight. This tool converts a file that is already on your device — there is nowhere to paste a link, and because everything runs in your browser there is no server that could fetch one. Use it for recordings you made, files you were sent, or content you have permission to use.
Can I convert MKV, WebM or AVI to MP3?+
Yes. MKV, WebM, AVI, MOV, M4V, FLV, WMV and 3GP all work, along with audio files if you want to convert between formats — an M4A to MP3, for instance. The tool reads whatever FFmpeg reads, which is nearly everything.
Does converting to MP3 reduce quality?+
Slightly, always, because MP3 is a lossy format and the audio in a video was almost certainly lossy already — so you are compressing something that was compressed once before. Choosing a bitrate above the source reduces that effect but never eliminates it. If quality matters more than compatibility, use Original audio, which does not re-encode at all.
Do I need an account?+
No. Every part of this works without one and there is no limit on how often you use it. There is nothing to sign up for here at all.
Can I extract audio from part of a video only?+
Yes. Tick 'Just part of it' and set a start and an end, and only that section is converted. It is also considerably faster than converting the whole thing, because the tool skips straight to the part you asked for instead of decoding everything before it.
Next to this
Everything here runs in your browser, free and without an account.