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Convert MP4 to MP3

Turn your MP4 files into MP3 — free, fast and right in your browser.

Runs locally — nothing is uploaded

Drop MP4 files here — or click to browse

Files are converted in your browser and never uploaded.

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This tool converts MP4 files to MP3 right in your browser. Drop the file, pick a bitrate, download — the recording is decoded and re-encoded on your device and never uploaded anywhere. The result is a finished MP3 file, no watermark and no signup.

What is MP4?

MP4 (ISO/IEC 14496-14) is the everyday video container: H.264 or HEVC pictures plus an AAC audio track, produced by every phone camera, screen recorder and streaming platform. Container and codec are two different things — an .mp4 file says how the data is packaged, not how it was compressed. That distinction is what makes fast conversion possible: if the pictures inside are already H.264 or HEVC, they can simply be repackaged instead of re-encoded. A typical consumer clip carries its sound at 128 to 192 kbit/s AAC.

What is MP3?

MP3 (MPEG-1/2 Audio Layer III) is the lossy audio format that made digital music portable. It was standardised in 1993 as part of ISO/IEC 11172-3 and plays on practically every phone, browser, car radio and cheap MP3 stick of the last 25 years. At the common 192 kbit/s one minute of stereo audio needs about 1.44 MB. Its last patents ran out in 2017, when Fraunhofer IIS ended the mp3 licensing programme — which is why free MP3 encoders are everywhere today.

Why convert MP4 to MP3?

From a video you often only want the sound: an interview, a talk, a concert recording. This tool reads the audio track out of the MP4 and writes it as MP3 — the format every car stereo, podcast player and ancient MP3 stick can play. The picture is discarded, your video file stays untouched.

How big will the MP3 be?

The sound inside an MP4 (ISO/IEC 14496-14) is almost always AAC at 128 to 192 kbit/s. As MP3 at 192 kbit/s one minute needs about 1.44 MB, so a half-hour talk ends up around 43 MB instead of several hundred. At 128 kbit/s it is 0.96 MB per minute, at 320 kbit/s 2.4 MB.

What are the limits?

The honest part: this is a second lossy encode. The AAC track was already compressed when the video was recorded, and MP3 compresses again — what is gone stays gone. If you want the original track untouched, extract it losslessly into an M4A instead: AAC fits into an MP4 container without re-encoding. The conversion here runs as a stream, so the video does not have to sit in memory as a whole; up to about three hours of runtime works in the browser.

How to convert

1. Drop your MP4 file(s) into the area or click to browse. 2. The target format MP3 is fixed; for MP3 you also pick the bitrate (128, 192 or 320 kbit/s). 3. Click Convert and download the file — multiple files come as a ZIP.

Frequently asked questions

Is converting MP4 to MP3 free?

Yes, completely free and without signup. There are no watermarks and no file-size limits beyond what your browser can handle.

Are my files uploaded?

No. The conversion runs entirely in your browser — your MP4 file never leaves your device and is not sent to any server.

Do I lose quality converting MP4 to MP3?

Yes, a little: MP4 is already lossy, and MP3 compresses a second time. At 192 kbit/s most ears will barely notice, at 320 kbit/s practically nobody does. It will never be better than the original, though.

Can I convert several files at once?

Yes. Just drop multiple files into the area — they are converted together and you can download them as a ZIP.

How long may my file be?

Up to about three hours. The audio track is streamed out of the video, so the video never has to sit in memory as a whole. If a file is longer, the tool stops with a clear message instead of freezing the tab.

Are title, artist and cover art preserved?

No. The file is decoded to raw audio and written anew, which drops ID3 tags and embedded cover art. Add the details afterwards in your player or a tag editor.