Convert MKV to MP3.
Pull the soundtrack out of an MKV video as an MP3 that plays on phones, car stereos and every computer.
Music and talks from MKV
MKV is common for concert recordings, lectures and anything saved from OBS. The MP3 is the part you can take on a run or play in the car.
Quality
The MP3 is encoded at 128 kbps, clear for speech and fine for casual music listening.
Size change
At 128 kbps the MP3 takes about 1 MB a minute, a tiny fraction of the MKV.
How it works
- 01
Upload your MKV
Drop a file or pick one from your device. Private by default.
- 02
Extract with ffmpeg
ffmpeg drops the picture and encodes the soundtrack as MP3 at 128 kbps.
- 03
Download
Grab your MP3.
MP3 at 128 kbps, plays on any device
Surround soundtracks mixed down to stereo
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Open-source ffmpeg engine
Extracting MP3 from MKV
This pulls the audio track out of your MKV and encodes it as MP3; the video is discarded. Audio quality is capped by what the original file contained.
Need more than a conversion?
Send your audio or video to TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items: automatically.
Common questions
Is it free?+
Yes. Convert MKV to MP3 free. No signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.
Is my file private?+
Your file is uploaded to a private bucket, converted on our own engine, and auto-deleted after 1 hour. It is never sent to a third-party converter.
My MKV has several audio tracks. Which one do I get?+
One track is extracted: the track marked as default, or if none is marked, the one with the most channels. If you need a different language or commentary track, make it the default track first, for example in MKVToolNix.
What happens to 5.1 sound?+
MP3 holds mono or stereo only, so a surround track is mixed down to stereo. For all six channels, use MKV to WAV.
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