Does this remove the video?

The output file is audio-only MP3 — the video track isn't included in it. Your original MP4 file is untouched; this creates a separate audio file from it.

Will this work with any MP4 file?

Yes, as long as the MP4 has an audio track. Screen recordings or silent video exports won't produce useful output since there's no audio to extract.

How much smaller will the MP3 be than the original video?

Significantly smaller, since you're dropping the video stream entirely — often 90%+ smaller, though it depends heavily on the source video's bitrate and length.

Are my files uploaded to a server?

No, extraction runs locally in your browser using WebAssembly FFmpeg.

Is there a file size limit?

No fixed limit, but very large or long videos are bound by your device's available memory since everything runs locally — this works best for clips up to a couple hundred megabytes.

Can I convert multiple MP4 files at once?

Yes, batch upload and download are supported.

MP4 to MP3 Converter

Extract the audio track from an MP4 video as MP3, right in your browser — free and private.

Drag & Drop Your MP4 Files

Or click to browse and select your files

Files processed locally in your browser — nothing uploaded to our servers. No account required.

MP3 Bitrate

Bitrate

Higher bitrates preserve more audio detail at a larger file size.

MP4 vs MP3: What's the Difference?

MP4 is a video container — it holds a video stream, an audio stream, and metadata all in one file. MP3 is audio-only. This tool doesn't "convert" MP4 to MP3 in the format-swap sense of JPG to PNG — it extracts the existing audio track out of the MP4 and re-encodes just that track as MP3, discarding the video entirely. That's why the result is dramatically smaller than the source file: you're keeping only the audio.

Frequently Asked Questions

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