Pull the audio out of your MKV file and save it as MP3, right in your browser.
Drag and drop the file, or click to browse. Files up to 500 MB are supported, and nothing is installed.
MP3 is already selected. Switch between MP3 and WAV if you change your mind.
We convert on our servers, usually in under a minute. Create a free account to download the MP3, or keep editing the file in REQO.
MKV (Matroska) is an open container that can hold any codec plus unlimited audio tracks, subtitle tracks and chapters. That flexibility makes it great for archives and useless for sharing.
The practical problem: Browsers, phones and social uploads reject MKV almost universally. Editing tools often refuse to import it, or import picture without audio. Nobody can preview it without installing VLC first.
MP3 solves that. Plays on every phone, car stereo, browser and podcast host in existence. Small enough to attach to an email or send in a chat. Accepted by every transcription and podcast service.
| MKV | MP3 | |
|---|---|---|
| Container | Matroska | MPEG audio layer III |
| Typical codecs | Almost anything: H.264, HEVC, AV1, VP9 | MP3 (lossy) |
| Best for | Archiving with multiple audio and subtitle tracks | Podcasts, voice notes, music you need to send |
| Plays on | VLC and desktop players; rarely anywhere else | Every device made in the last 25 years |
| File size | Depends entirely on the codec inside | Roughly a tenth of uncompressed audio |
Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the MP3 itself beyond the free-plan badge.
No. The conversion runs on our servers and the whole flow happens in your browser, so it works the same on Windows, macOS, Linux, iPhone and Android.
The audio is decoded from the video and written as MP3. MP3 is a lossy format, so there is a small re-encode, inaudible for speech at the default quality. The picture is discarded entirely, which is why the file gets so much smaller.
Up to 500 MB per file. For anything bigger, trim or compress it first, both are free tools here.
Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.
To MP4
Turn your MKV file into an MP4 that plays where you need it, right in your browser.
OpenTo WebM
Turn your MKV file into a WebM that plays where you need it, right in your browser.
OpenTo MOV
Turn your MKV file into a MOV that plays where you need it, right in your browser.
OpenTo MP3
Pull the audio out of any video and save it as MP3, right in your browser.
OpenTo MP3
Turn any audio file into an MP3 that plays where you need it, right in your browser.
OpenTo MP3
Pull the audio out of your MP4 file and save it as MP3, right in your browser.
OpenFree, in your browser, and the file stays open in a full video editor afterwards.