Convert MP4 to MP3 Online Without Uploading

Drop an MP4 into the box above and get an MP3 back in seconds. The whole conversion runs inside this tab using your browser's own media engine - your file is never sent to a server, so a two-hour recording is as private as a ten-second clip.

No upload, no queue, no account
Choose 320, 256, 192, 128, 96 or 64 kbps
Works on Chrome, Edge and Safari on desktop and Android

Bitrate

How to Convert MP4 to MP3 in Your Browser

There is no software to install and no account to create. Three steps, and the second one is the only one that takes any real time.

Pick your MP4 file
Click the drop zone and choose an .mp4, .m4v or .mov file, or drag it straight from your desktop. Nothing leaves your device at this point - the file is read locally and never travels over the network.
Choose a bitrate and convert
The audio track is decoded and re-encoded to MP3 inside the tab. A 30-second clip finishes in about one second; a full hour of speech usually takes under a minute on a modern laptop, a little longer on a phone.
Download the MP3
When the progress bar settles the file is ready. The download is generated from memory in your browser, so there is no expiring link and no re-download limit - save it wherever you like.

Nothing Is Uploaded - the Conversion Happens on Your Device

Most online converters work the same way: your file is uploaded to a server, converted there, stored for a while, and then offered back to you as a download link. That is fine for a public trailer, less fine for a client call recording, a medical consultation, or anything with a person's voice in it.

Vidkito does the work differently. The MP4 is opened with the File API, unpacked with mp4box.js, decoded with the browser's built-in AudioDecoder, and re-encoded with a JavaScript MP3 encoder - all of it running in the page you are looking at. No byte of your video is transmitted. You can confirm it yourself: open your browser's developer tools, switch to the Network tab, and watch it stay quiet while the conversion runs.

The practical upside is speed as well as privacy. There is no upload time and no download queue, so a large file converts at roughly the speed of your own CPU rather than the speed of your connection.

Which Bitrate Should You Choose?

Bitrate is the only setting that matters here. Higher means better sound and a bigger file; every step down roughly halves the size. If you are not sure, 192 kbps is the safe middle.

Bitrate	Per minute	Best for
320 kbps	≈ 2.4 MB	Music, anything you will listen to on good headphones
256 kbps	≈ 1.9 MB	Music where file size still matters
192 kbps	≈ 1.4 MB	Podcasts, interviews, lectures - the default choice
128 kbps	≈ 1.0 MB	Speech you only need to understand
96 kbps	≈ 0.7 MB	Voice memos, long recordings, tight storage
64 kbps	≈ 0.5 MB	Archiving speech where size is the priority

One caveat worth knowing: re-encoding never improves quality. If the MP4's audio track was already compressed at 128 kbps, exporting at 320 kbps gives you a bigger file with the same sound. Match the source - or go one step above it, no further.

MP4 vs MP3: What Actually Changes

An MP4 is a container, not a codec. Inside it there is usually a video track (H.264 or H.265) and an audio track (most often AAC). An MP3 file holds only audio, encoded with the MPEG-1 Layer III codec.

So converting MP4 to MP3 is really two moves: throw away the video track, and re-encode the audio from AAC to MP3. The picture is gone for good - you cannot get it back from the MP3 - but the sound survives at the quality you picked. That is exactly what you want when the video was only ever a wrapper around a recording: a webinar, a screen share, a voice note someone sent as an MP4.

If you ever need the video back, keep the original MP4. The MP3 is a derivative, and no converter can rebuild a video track from audio.

When MP4 to MP3 Is the Wrong Choice

Converting to MP3 is the right move most of the time, but not always. Three cases where another tool serves you better:

You only need part of the recording

If the interesting ten minutes sit in the middle of a two-hour file, converting the whole thing wastes time and disk space. Trim the video first, then convert the trimmed file - the result is smaller and the conversion is faster.

splitting the video into parts

You want to keep working with video

If the plan is to cut, re-order or share clips rather than listen to them, MP3 is a dead end - you would be throwing away the picture you still need. Split and cut the MP4 instead, and convert only the parts you actually want as audio.

You are converting a protected or streamed file

This tool reads ordinary local files. It cannot open DRM-protected downloads or pull audio out of a streaming service, and it is not built to. If a file will not open, it is almost always protected or corrupted rather than something the converter got wrong.

What This MP4 to MP3 Converter Can and Cannot Handle

MP4, M4V and MOV files whose audio track is AAC or MP3
Mono and stereo audio at any common sample rate
Files of any length, limited only by your device's memory
Multiple audio tracks - the first one is the one that gets converted

Video files with no audio track at all (you will see "This MP4 has no audio track.")
Files whose audio is encoded with an unusual codec the browser cannot decode
DRM-protected or encrypted downloads
Chapter markers, cover art, subtitles and extra audio tracks - an MP3 file has nowhere to put them

One detail that surprises people: the MP3 is a fresh encode, not a copy of the original audio stream. That is unavoidable - MP4 audio is almost always AAC, and MP3 players do not read AAC.

Extracting Audio From a Video: Common Situations

A few of the reasons people land on this page, and which setting fits each one.

Turning a recorded lecture into something you can listen to on the train

Lecture recordings are usually long, mostly speech, and never watched twice. 128 kbps mono keeps the words clear and turns a 90-minute video into roughly 90 MB you can put on any phone.

Pulling the audio out of a client interview

Interviews carry a lot of value as searchable, transcribable audio - and as documentation. 192 kbps or 256 kbps is the right range here, and because nothing is uploaded, a recording covered by an NDA never leaves your machine.

Saving the music from a video you made yourself

If you edited a video and want the soundtrack as a separate file, export at 320 kbps. It will not beat the original, but it is the highest the MP3 format offers and indistinguishable from the source on most playback equipment.

Making a voice memo someone sent as an MP4 easier to keep

Phones sometimes record as MP4 with a single audio track. Converting to 64 kbps or 96 kbps gives you a small file that opens in any player, any operating system, forever - no codec packs, no video app required.

Frequently Asked Questions

Is this MP4 to MP3 converter really free?

Yes. There is no payment, no signup, no watermark and no daily limit. The conversion runs in your own browser, which is why there is nothing to charge for.

Are my files uploaded to a server?

No. The file is opened locally with the File API and decoded by your browser. You can verify this in your browser's Network tab - no request carries the file.

What is the maximum file size?

There is no fixed limit set by us. The real ceiling is your device's available memory, and in practice files of several hundred megabytes convert fine on a modern computer.

Which bitrate should I pick?

192 kbps for speech, 320 kbps for music. Going above the source bitrate only makes the file bigger, never better.

Does converting to MP3 lower the audio quality?

Slightly, because MP3 is a lossy format and the audio has to be re-encoded. At 192 kbps and above the difference is hard to hear on speech; at 320 kbps most listeners cannot tell it apart from the original.

Can I convert a video that has no audio track?

No. If the MP4 contains only video, there is nothing to encode and the tool will tell you so instead of producing an empty file.

Does it work on a phone?

Yes, on Chrome for Android and Safari on iOS. Large files convert more slowly on a phone than on a laptop, and iOS may ask you to keep the tab in the foreground.

Why did my converted file come out silent?

Almost always because the source audio used a codec the browser cannot decode, or because the MP4 holds several tracks and the audio is not the first one. Try the file in another browser, or check the track layout with a media info tool.

Other things Vidkito does, all in the browser and all without uploading your files.

Video SplitterSplit a long video into smaller parts before converting only the section you need.MP4 SplitterCut an MP4 at any timestamp and keep the pieces you actually want.Cut Video in HalfDivide a video into two equal halves in a couple of clicks.