MP4 to MP3 Converter — Extract Audio from Video Free

Pull the audio out of any video — on your device

A lecture recording where only the words matter. A voice memo trapped inside a phone video. Music you produced, mixed down in a video export. Extracting the audio track is one of the oldest media tasks there is — and this tool does it with FFmpeg running inside your browser, so the file with your voice, your meeting, or your work in it never touches a server.

Your files, not the internet's

To be direct about what this tool is not: it does not download audio from YouTube, Instagram, or anywhere else, and it never will. Tools that rip platform streams operate in legal grey zones with other people's content. This converter works on files you already own — which is precisely why it can run fully offline, with no takedown notices, no link-parsing tricks, and no server in the middle.

MP3, M4A, or WAV — a thirty-second decision

MP3 at 192 kbps is the default for a reason: universally playable and transparent for most content. M4A (AAC) squeezes slightly better quality into the same bitrate — ideal inside the Apple ecosystem. WAV skips compression entirely, producing large, lossless files that editing software loves. For voice recordings, dropping to 128 kbps MP3 cuts file size by a third with no meaningful loss.

Part of the on-device video suite

Extraction pairs naturally with the other tools here: cut the relevant span first with the video trimmer, or shrink the video itself with the compressor once the audio is safely extracted. Everything shares one in-browser engine — one download, zero uploads, no limits.

Frequently asked questions

Is my video uploaded to convert it to MP3?

No. The extraction runs on FFmpeg compiled to WebAssembly in your own browser — the engine downloads once (~31 MB), and your video is decoded and its audio re-encoded entirely on your device. Nothing is transmitted or stored anywhere.

Can this download audio from YouTube or other sites?

No, and deliberately so. This tool works only on video files you already have on your device — your recordings, lectures you've been given, your own footage. It doesn't fetch, rip, or download content from any platform.

Should I choose MP3, M4A, or WAV?

MP3 for universal compatibility — every player, car stereo, and app handles it. M4A (AAC) sounds slightly better at the same bitrate and is native on Apple devices. WAV is uncompressed and lossless — the right choice as an editing source, at roughly 10 MB per minute.

What bitrate should I pick?

192 kbps is the sweet spot for music and mixed content. 128 kbps is fine for voice — lectures, meetings, podcasts — at two-thirds the size. 320 kbps is MP3's ceiling, worth it only when the source audio is genuinely high quality.

Which video formats can I extract audio from?

Anything FFmpeg reads: MP4, MOV, WebM, AVI, MKV, 3GP, and most phone and camera formats. Audio-only inputs work too — you can use this tool to convert between MP3, M4A, and WAV directly.