MP4 to MP3 Converter

Pull the audio out of any video and save it as an MP3. Free, fast, and your files never leave your device.

Drop a video here or click to choose

Supported input: MP4, MOV, MKV, WEBM, M4V, AVI

Loading the audio engine — first time only. This downloads roughly 32 MB and is cached afterwards.

How to convert MP4 to MP3

  1. Drop your video (MP4, MOV, MKV, WEBM, M4V or AVI) into the box above, or click to browse.
  2. Check the detected duration, then choose an MP3 bitrate: 128, 192 or 320 kbps.
  3. Click Convert to MP3. The first run downloads the engine (about 32 MB, cached for next time).
  4. Preview the extracted audio right on the page to make sure it is what you want.
  5. Click Download MP3 to save the audio file.

Why use ZillaKit's MP4 to MP3 Converter?

This is the fast, private way to turn a video into an MP3. The conversion runs entirely inside your browser using a WebAssembly build of FFmpeg, so your video is never uploaded to a server and never leaves your device. Most MP4 to MP3 sites online make you upload the whole file first, then hand your content to their cloud and often stamp the result with limits or ads baked into the audio. Here the video stays on your computer, the audio track is copied out and re-encoded to MP3 locally, and you get a clean file with the bitrate you choose. It is perfect for saving music, podcasts, lectures, interviews, voice notes and soundtracks from video you already have the rights to. The tool accepts MP4, MOV, MKV, WEBM, M4V and AVI, drops the video stream entirely for speed, and encodes with the well-known LAME MP3 encoder at 128, 192 or 320 kbps. There is no signup, no watermark and no email required, and it is completely free with a generous daily allowance. Because everything is local, it is quick for typical clips and stays completely private.

FAQ

Is my video uploaded anywhere?

No. All extraction and encoding happen locally in your browser using FFmpeg compiled to WebAssembly. Your video never leaves your device.

Which video formats can I convert?

You can convert MP4, MOV, MKV, WEBM, M4V and AVI. The tool extracts the audio track and encodes it to MP3.

Which MP3 bitrate should I pick?

192 kbps is a great default for most music and speech. Choose 320 kbps for the best quality and larger files, or 128 kbps for smaller files where size matters more than fidelity.

Why does the first conversion take a moment to start?

The first run downloads the audio engine, roughly 32 MB. Your browser caches it, so every conversion after that starts much faster.

Does converting to a higher bitrate improve poor source audio?

No. Re-encoding cannot add detail that was not in the video's audio track. A higher bitrate only preserves what is there and makes the file larger, so match the bitrate to your source.

Is there a file size limit?

There is no hard limit, but very large videos can exhaust the memory a browser tab is allowed to use. If a big file fails, try a desktop browser.