Extract the audio from a video
Drop in an MP4, MOV, MKV or WebM and get the soundtrack as an MP3. The file never leaves your computer - the conversion runs in this tab, not on a server.
Nothing is uploaded. Close the tab and the file is gone.
Why this one runs in your browser
Most online converters ask you to upload your video to their server, wait in a queue, then download the result. That means handing a file - often an interview, a lecture or a client recording - to a company you know nothing about, and trusting their retention policy.
This tool does the same job with the same software, ffmpeg, compiled to run inside the browser. Your video is read from disk, converted in this tab and handed back. It is the same extraction step Speecho runs before transcribing a video, which is why the speech preset is here too - 64 kbps mono is what a speech model actually needs.
Questions
Is my video uploaded anywhere?
No. The converter itself is downloaded to your browser the first time you use it, and then everything happens locally. You can check in your browser's network tab: your file is never sent.
Why does it download 30 MB the first time?
That is ffmpeg compiled to WebAssembly - the actual conversion engine. It is fetched once and then cached by your browser, so the second conversion starts immediately.
What is the file size limit?
There is no limit we impose, but the whole file is held in memory, so very large videos can exhaust a tab on a modest machine. A few gigabytes is usually fine on a desktop; on a phone, expect less.
Which quality should I choose?
Pick 192 kbps stereo if a person is going to listen to the result. Pick 64 kbps mono if the audio is going into a transcription or subtitle tool - speech models down-mix to mono anyway, and the smaller file uploads faster.
Which formats work?
MP4, MOV, MKV, WebM and AVI cover almost everything. If a file fails, it usually contains an unusual codec that the browser build of ffmpeg does not include.