My MKV has several audio tracks. Which one do I get?

The first one this browser can play. An MP3 holds a single track, so the others are left out.

Is there a file size limit?

There is no upload limit because the file stays on your device. Very large files depend on your browser's memory and speed.

MKV to MP3

Save the sound from an MKV video as an MP3. Processing stays on your device.

Files stay on your device

Drop a file to convert

See its format, then choose an output.

Any media file this browser’s engine can read.

How to convert MKV to MP3 online

Open a Matroska MKV file and export its audio as an MP3. The MKV to MP3 converter drops the video and encodes the first audio track in your browser, so large MKV files are never uploaded.

Step 1
Choose your MKV
Pick a file or drop it into the converter above.
Step 2
Keep MP3
MP3 is selected; choose another audio format if you need one.
Step 3
Download the MP3
Save the sound when the conversion finishes.

What to expect

Supported inputs: MKV videos and other readable video or audio files.
What happens: The video track is dropped and the first playable audio track is encoded as MP3. MP3 is selected first; you can choose another audio format.
Limits: The MKV needs an audio track this browser can decode. Only one audio track is converted; other audio and subtitle tracks are left out.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

No upload
No signup
No watermark