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MKVMP3

Convert MKV to MP3

This free MKV to MP3 converter pulls the audio track out of your Matroska Video (.mkv) video and saves it as an MP3, entirely in your browser. There is nothing to install, no account to create, and no watermark on the result.

100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

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The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. MP3 is best for universal music and podcast playback, which is the usual reason to pull the audio out of MKV.

Why convert MKV to MP3?

  • MP3 plays on more devices and apps than MKV, so it is the safer choice for sharing.
  • The MP3 is far smaller than the original MKV video, because it keeps only the audio track.
  • Pick MP3 when you need a file made for universal music and podcast playback.

MKV vs MP3

PropertyMKVMP3
Full nameMatroska VideoMPEG-1 Audio Layer III
ContainerMatroskaMP3
Typical codecH.264 / H.265MP3
CompatibilityLimitedUniversal
Relative sizeMediumSmall
Best forArchiving with multiple tracks and subtitlesUniversal music and podcast playback

How to convert MKV to MP3

  1. Add your MKV file

    Drag and drop your .mkv file onto the upload area, or click to browse and pick it from your device.

  2. Start the conversion

    Click "Convert to MP3". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.

  3. Wait a few seconds

    A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.

  4. Download your MP3 file

    When it finishes, download the .mp3 file straight to your device.

Frequently asked questions

Is this MKV to MP3 converter free?
Yes. It is completely free with no signup, no watermark, and no limit on how many files you convert. It is supported by ads, which keeps the conversion itself free.
Are my files uploaded to a server?
No. The conversion runs locally in your browser using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is processed in memory on your own device and is never uploaded, stored, or seen by anyone.
Will I lose quality converting MKV to MP3?
MP3 is a lossy audio format, so the extracted track is re-encoded. Choosing a higher quality keeps it close to the source; the tool cannot add quality the original audio did not have.
Will the file get smaller or larger?
Much smaller. An MP3 holds only the audio, so it is a small fraction of the original MKV video's size.
What is the difference between MKV and MP3?
MKV is Matroska Video (a Matroska container, typically H.264 / H.265); MP3 is MPEG-1 Audio Layer III (an MP3 container, typically MP3). MP3 is best for universal music and podcast playback, while MKV is best for archiving with multiple tracks and subtitles.
How long does the conversion take?
Most files finish in a few seconds to under a minute, depending on length and your device. The first conversion is a little slower while the engine downloads and caches, then later runs start instantly.

Related conversions

M4A → MP3WAV → MP3FLAC → MP3AAC → MP3OGG → MP3WMA → MP3

Need more formats or options? Use the full Video to MP3 Converter.