MKV to MP3 Converter

MKV (Matroska) files often come from screen recorders like OBS, video downloads and older recordings. This converter takes the audio out as an MP3 you can play anywhere. Everything happens inside your browser with ffmpeg, the open-source engine behind many video apps. Your file is not uploaded to our server.

MKV to MP3 converter with an OBS MKV recording converted to MP3
An MKV screen recording converted to MP3 in the browser.

How to convert MKV to MP3

  1. Tap Choose a video and pick your MKV file. OBS recordings are usually in your Videos folder.
  2. Leave the format on MP3 and pick the quality. 192 kbps is right for most music; 128 kbps is plenty for speech.
  3. Tap Convert to MP3, play the preview, then tap Download MP3.

Convert only part of the video

Tick Only convert part of it, play the video to the moment you want, and tap Use current time for the start and the end. You can also type times like 1:05. Handy for saving one song from a long recording, or a single answer from a lecture.

MP3, M4A, WAV or OGG?

  • MP3 plays on everything: phones, car stereos, old MP3 players. Pick this if you are not sure.
  • M4A (AAC) sounds a little better than MP3 at the same size and is the native format on iPhone and in iTunes.
  • WAV is uncompressed. Use it for editing in Audacity, GarageBand or a video editor. Files are about 10 MB per minute.
  • OGG is an open format used by some games, Android and Linux apps.

Frequently asked questions

My MKV has several audio tracks. Which one is converted?

The first audio track, which is normally the main one. If you need a different track, a desktop tool like VLC or ffmpeg can pick it.

The MKV preview shows no picture. Will it still work?

Yes. Some browsers cannot play MKV video, but the converter can still read the audio. Just tap Convert.

Is there a file size limit?

No fixed limit. Very large files, roughly over 500 MB, can run out of memory in a phone browser; a computer handles them better.

Is it really free?

Yes. No sign-up, no watermark and no limit on how many files you convert.

More free audio and video tools

Scroll to Top