Runs on your machine, not our servers

Pull the audio.
Keep the video.

Load one or more WebM/MKV files, hit convert, and download the MP3 and rebuilt MKV for each. Everything happens locally in your browser tab — nothing is uploaded.

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Drop files here, or use the button below

Working on it

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Debug log (copy this if asking for help):

🖥️ A desktop app for larger files is on the way — it won't have this limit, since it runs a real converter on your machine instead of inside the browser. It'll be linked here as a free download once it's ready.

How a conversion runs

Load

Your file is read only inside this tab. Nothing is uploaded anywhere — the "server" for this step is your own CPU.

Extract

FFmpeg (compiled to WebAssembly) demuxes the Opus track and re-encodes it as MP3.

Rebuild