Will the MP3 sound as good as the video did?

Yes, to the limit of what the video carried. The audio inside an MP4 is usually AAC, and converting it to MP3 is a re-encode — one generation of loss, kept as small as the format allows by encoding at 320 kbps. For listening it is very hard to hear. If you are going to edit the audio, choose WAV instead and skip the second lossy step.

How long a video can it take?

About an hour and a half in Chrome and Edge, which won't decode more audio than that in one go. Firefox and Safari take up to three hours and cut anything longer there. Memory counts as well, because the sound is decoded whole before it is encoded, so a phone manages less than a computer. A lecture or podcast of an hour is fine anywhere.

Can it pull audio from YouTube?

No. It converts files you already have — it cannot download from YouTube or anywhere else, and a page that offers to is dealing with those sites' terms in ways this one deliberately does not. If you have the MP4 on disk, whatever its origin, it will convert.

Why did my file fail?

Usually DRM: a film bought from a store is encrypted, and the decryption never passes through pages like this one. More rarely, an MP4 whose audio track uses a codec browsers do not ship — AC-3 from some rippers is the classic. A screen recording, a phone video or a downloaded clip will work.

Is it free, and is my file uploaded?

Free, no account, no limit on how many files. Decoding and encoding both happen in your browser. Your files are never uploaded.

Convert MP4 to MP3

Your browser already knows how to play an MP4, which means it already knows how to decode one. This uses exactly that: the video opens in the page, the picture is set aside, and the sound comes back as an MP3. Your files are never uploaded and there is no queue behind other people's files — the only wait is your own machine: seconds for a clip, a couple of minutes for an hour-long lecture.

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Your videos
Drop your MP4 videos here
MP4MP3WAV
Your files are never uploaded.
What you want back
Your files

How to convert MP4 to MP3

Add your MP4 files

One video or a folder of them. They are decoded by your browser and never uploaded.
Leave it on MP3

320 kbps, the top of the format. Switch to WAV if you are taking the audio into an editor.
Save the MP3s

One click each, or the whole batch as a zip.

What you get

You keep the sound; the picture is left behind

A lecture recording, a concert clip, an interview — the video half is often just weight. This keeps the sound and leaves the rest, and it says so before you press the button rather than surprising you after.

As fast as your machine, because there is no server

Sites that upload your video make you wait twice: once for a gigabyte to crawl up your connection, once for the queue. Here the file never leaves, so the only cost is your own machine's decode and encode — and no part of it depends on anyone's server having a good day.

320 kbps, the most MP3 can hold

The encode is done at the top of the format, so nothing is lost that MP3 could have kept. What it cannot do is invent quality: if the video carried 128 kbps audio, that is what there is to keep.

Your video is never uploaded

The whole conversion happens in this page. For a recording of a private meeting or a lecture, that is not a convenience — it is the difference between converting a file and publishing it to a server you know nothing about.

Questions about MP4 and MP3

Will the MP3 sound as good as the video did?: Yes, to the limit of what the video carried. The audio inside an MP4 is usually AAC, and converting it to MP3 is a re-encode — one generation of loss, kept as small as the format allows by encoding at 320 kbps. For listening it is very hard to hear. If you are going to edit the audio, choose WAV instead and skip the second lossy step.
How long a video can it take?: About an hour and a half in Chrome and Edge, which won't decode more audio than that in one go. Firefox and Safari take up to three hours and cut anything longer there. Memory counts as well, because the sound is decoded whole before it is encoded, so a phone manages less than a computer. A lecture or podcast of an hour is fine anywhere.
Can it pull audio from YouTube?: No. It converts files you already have — it cannot download from YouTube or anywhere else, and a page that offers to is dealing with those sites' terms in ways this one deliberately does not. If you have the MP4 on disk, whatever its origin, it will convert.
Why did my file fail?: Usually DRM: a film bought from a store is encrypted, and the decryption never passes through pages like this one. More rarely, an MP4 whose audio track uses a codec browsers do not ship — AC-3 from some rippers is the classic. A screen recording, a phone video or a downloaded clip will work.
Is it free, and is my file uploaded?: Free, no account, no limit on how many files. Decoding and encoding both happen in your browser. Your files are never uploaded.

Need the words rather than the sound? The transcriber turns recordings into text, on this same no-upload model. Cleaning up a noisy recording first? Remove the background noise. Or see all the audio tools.

Your videos

What you want back

Your files