1
Choose Your Video
Choose the MKV file or drop it on the page.
MKV to MP3 Converter
Extract the sound from an MKV video as an MP3, right in your browser. Works for most MKV recordings; the file is never uploaded.
Files stay on your device
Drop your MKV here, or choose a file
Converts MKV video with AAC, Opus, Vorbis, MP3 or FLAC sound to MP3 at 128 to 320 kbps. It stays on your device.
Choose a fileYour browser converts the file. Nothing is sent to a server.
- No signup, no watermark
- No upload size limit
- About 2 sec for a 47 sec clip
- Works offline once loaded
How to Convert MKV to MP3
2
Pick Quality and Trim
Pick an MP3 bitrate and, if you want one part, turn on Trim and set the start and end.
3
Convert and Download
Press Convert to MP3. When the preview plays, download the MP3.
What Is an MKV File?
MKV (Matroska) is an open container that can hold several video, audio and subtitle tracks in one file. OBS Studio offers it as a crash-safe recording format, and many films and episodes are shared as MKV.
The audio inside an MKV can be almost any codec. Browsers decode AAC, Opus, Vorbis, MP3 and FLAC, so MKV files with those convert here. Movie files with AC-3 (Dolby Digital) or DTS sound usually do not.
| Audio codec in the MKV | Common in | Converts here |
|---|---|---|
| AAC | OBS recordings, phone and web video | Yes |
| Opus or Vorbis | Open-source tools, web video | Yes |
| MP3 or FLAC | Music videos, archives | Yes |
| AC-3, E-AC-3, DTS | Film and TV releases | Usually not |
Why Convert MKV to MP3
Keep a Recording's Sound
Save the commentary from an OBS gameplay or tutorial recording as a small MP3.
Play Where MKV Will Not
Phones, car stereos and music apps rarely open MKV. MP3 plays on all of them.
Much Smaller Files
An hour-long MKV can be several gigabytes; the same hour as a 128 kbps MP3 is about 58 MB.
If an MKV File Does Not Convert
When an MKV fails or comes out silent, the sound track is almost always AC-3, E-AC-3 or DTS. Browsers do not decode those codecs.
MKV files with more than one audio language convert the default track. Support for every codec and track choice needs a full media engine, which is planned.
MKV to MP3: Frequently Asked Questions
Why will my MKV file not convert?
Its sound is probably AC-3, E-AC-3 or DTS, which browsers cannot decode. MKV files with AAC, Opus, Vorbis, MP3 or FLAC sound convert.
Which audio track is converted from an MKV with several languages?
The default track, which is usually the first one. Choosing a different track is not available yet.
Is my MKV file uploaded to a server?
No. Your browser reads the MKV file and writes the MP3 on your own device. Nothing is sent to MP4toMP3.io or anyone else, and the page keeps working with Wi-Fi off once it has loaded.
Can I convert an OBS recording to MP3?
Yes. OBS saves AAC sound in its MKV recordings, which converts in any modern browser.
Can I convert a long MKV?
Yes. Up to about 45 minutes converts in one quick pass on a computer; longer files use a slower mode that plays the sound through once.
Ready to Convert MKV to MP3?
Choose a file at the top. It is free, private and done in your browser in a few seconds.
Convert now