MP4 to MP3 Converter

Extract MP3 audio from MP4, MOV, MKV, WebM, and AVI videos right in your browser. Choose the bitrate. Your video never leaves your device.

Runs in your browser — nothing uploaded

Pull the audio out of a video and save it as an MP3 — without uploading anything. This converter runs ffmpeg directly in your browser, so your MP4, MOV, MKV, WebM, or AVI file is processed on your own device. Choose the output bitrate, preview the result, and download a clean MP3 in seconds.

Private by design — your data never leaves your device

How to use it

No account, no upload — it all happens on your device.

1
Drop a video file onto the box, or click to choose one from your device.
2
Pick the MP3 quality (bitrate) you want.
3
Click Extract MP3 and wait for the progress bar to finish.
4
Preview the audio, then download your MP3.

Why convert MP4 to MP3 in the browser

A local converter avoids the privacy and size limits of upload-based sites.

  • Your file stays private. Lectures, interviews, voice memos, and unreleased music never touch a server — there is nothing to upload and nothing to delete afterward.
  • No file-size upload caps.Because the work happens locally, you are limited by your device's memory, not by a website's upload limit.
  • Works offline. Once the converter has loaded once, it keeps working with no connection at all.

Supported input formats

Common containers you can extract audio from.

The tool accepts the formats most cameras, phones, and screen recorders produce: MP4 and M4V, MOV (Apple), MKV, WebM, and AVI. The audio track is decoded and re-encoded to MP3 at the bitrate you choose. Very large or long videos take longer and use more memory, since everything is processed in your browser tab.

Bitrate, quality, and file size

MP3 bitrate is the trade-off between sound quality and file size. 128 kbps produces the smallest files and is fine for spoken-word audio like podcasts. 192 kbps is the sweet spot for most music. 320 kbps is the highest standard MP3 quality and the largest file. The source audio sets a ceiling — encoding a low-quality track at 320 kbps will not add detail that was never there.

Frequently asked

Is my video uploaded to a server?
No. The conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your video is read directly from your device and never uploaded anywhere.
Why does the first conversion take a moment to start?
The first time you convert, the browser downloads the WebAssembly audio engine (about 31 MB). It is cached afterward, so later conversions start instantly and work even offline.
What bitrate should I choose?
192 kbps is a good balance of size and quality for most music and speech. Pick 320 kbps for the best quality, or 128 kbps when you want the smallest file.

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