MKV to MP3 converter

Pull the soundtrack, a concert or a lecture out of an MKV as an MP3 that any phone or car stereo plays.

Drop a MKV file hereThe converter loads in your browser.

What happens to your MKV

The first audio track (AAC, AC-3, DTS, FLAC, Opus or Vorbis, all common in MKV) is decoded and encoded to MP3; the video is ignored, so it is quick even for a full movie.

Tip: MKVs often carry several audio languages. The converter takes the first (default) track; use desktop FFmpeg with -map 0:a:1 for the second.

How to convert MKV to MP3

  1. Drop your MKV file on the box above, or tap it to pick one. The engine (about 31 MB) loads once per visit.
  2. The converter reads the file's streams and shows which codecs are inside.
  3. Pick a bitrate, or leave the default to keep the original audio when possible.
  4. Press the button, wait for the progress bar, then download your MP3.

Prefer the command line?

This is the FFmpeg command the converter runs for a typical MKV (h264 + aac). Paste it into a terminal with FFmpeg installed for batch jobs or files too big for a browser tab:

ffmpeg -y -i input.mkv -vn -sn -c:a libmp3lame -q:a 2 output.mp3

This re-encodes, so expect it to take a while on long files. Your own file may contain different codecs; the converter above detects them and adapts. For other jobs, ask the FFmpeg command helper.

Questions

Can I pick which audio track?

The browser tool uses the first audio track. The FFmpeg command helper on this site can write the command to extract any other track.

Is 5.1 surround kept?

MP3 is stereo at most, so surround audio is downmixed. Choose FLAC or WAV to keep all channels.

Is my MKV file uploaded?

No. The MKV is read from your device by FFmpeg running as WebAssembly in the page, and the MP3 is written back to your device. No server ever receives it.

Is there a size limit for MKV to MP3?

We set none. The practical limit is browser memory: roughly 2 GB of output on a computer, and much less on phones.