Audio
MKV to MP3, keeping only the sound
MKV files are often large recordings where the picture is beside the point — a lecture, a concert, a livestream capture. This keeps the audio and drops the rest.
Processed on your own hardware · never transmitted, never stored
What happens when you drop a file in
The file stays put. Your browser opens it the same way an image viewer would. There is no transfer, which is why there is no upload bar to watch.
An encoder arrives once. The first job on this site pulls down a compiled build of FFmpeg, roughly 30 MB. It is kept afterwards, so every job after the first starts immediately.
Your own hardware does the job. The work happens in this tab, on your processor. A laptop from the last few years handles short clips in well under real time.
The result lands in Downloads. Assembled in memory and handed straight to your browser. Close the tab and every trace of it is gone.
Why MKV specifically
MKV is the container of choice for long recordings: livestream captures, archived broadcasts, ripped lectures. Those are exactly the files where the audio alone is what you actually wanted.
The size difference is dramatic. A two-hour MKV can run several gigabytes; the same two hours as a 128 kbps MP3 is around 110 MB, which fits anywhere and streams over any connection.
MKV files frequently carry more than one audio track — an original language and a dub, or a commentary. This tool takes the first track it finds.
If you need a different track
There is no track selector here, because choosing between them requires inspecting the file in a way a browser tab handles poorly. If your MKV has several languages and you need a specific one, a desktop tool like MKVToolNix will let you pick before converting.
Common questions
Which audio track do I get?
The first one in the file, which is usually the original language.
Can I keep the video?
Not with this tool — it produces audio only. Use the MKV to MP4 converter if you want to keep the picture.
Why is my file taking so long?
Long recordings take real time to decode. A two-hour file is a genuine wait.
Do my files get uploaded?
No. The whole conversion runs locally.