Convert MKV to MP3
Extract MP3 audio from MKV video free. Works with OBS recordings and large MKV files. No upload, no install.
Drop a video or audio file here
or click to browse. Converted in your browser, nothing uploaded.
MP4 · MOV · MKV · WebM · AVI · WAV · M4A · FLAC · OGG · OPUS and more
🔒 Converted on your device. Your file is never uploaded.
MKV is common for OBS recordings, game captures, and archived video. Convert it to MP3 to keep a commentary track, a stream VOD’s audio, or a recorded talk as a small audio file.
There’s nothing to install and nothing to upload. FFmpeg runs in your browser.
How it works
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Drop your file
Video or audio in any common format. Nothing is uploaded.
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Converted in your browser
FFmpeg runs on your device, so even big files start right away.
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Download
Save the new file. No watermark, no account, no queue.
Frequently asked questions
Is my file uploaded to a server?
No. The converter (FFmpeg compiled to WebAssembly) runs inside your browser, so the file never leaves your device. That also means there is no upload wait, even for big videos.
Which audio track is used?
The first audio track. If your MKV has separate microphone and game tracks, remux it first to put the one you want first.
How long does a large MKV take?
Usually well under real time on a modern computer: an hour of audio often converts in a minute or two.