Convert MKV to MP4
Turn your MKV files into MP4 in seconds, right in your browser. No upload, no sign-up, no watermark.
How to convert MKV to MP4
Drop your MKV
Add your file. It stays on your device.
Choose MP4
And the quality profile.
Download
Your MP4 video is ready.
Converting MKV to MP4
MKV is a flexible container that can hold many tracks but is not played everywhere. Because MP4 is universal, converting MKV to MP4 fixes most compatibility problems: the video then plays on phones, browsers, TVs and social platforms.
The container changes, but the conversion aims to preserve the original quality as closely as possible.
Conversion runs in your browser with WebAssembly, so your video never leaves your device.
MKV vs MP4: what's the difference?
| Criterion | MKV | MP4 |
|---|---|---|
| Multiple tracks (audio, subtitles) | Yes — its specialty | Limited to the essentials |
| Compatibility | Weak on mobile, TV and social | Universal |
| In-browser playback | Rarely supported | Native |
| Typical use | Movie archiving | Sharing and playing anywhere |
Good to know: MKV can hold several audio tracks and subtitles. Converting to MP4 keeps only the main track — that's the price of universal compatibility.
When should you convert MKV to MP4?
- Play the video on a phone, tablet or TV that rejects MKV.
- Publish it online or open it straight in a browser.
- Import it into editing software that doesn't handle MKV.
- Send it to someone without asking them to install a special player.
Frequently asked questions
Why convert MKV to MP4?
For a video that plays everywhere, on every device and accepted by social networks.
Is MKV to MP4 conversion free?
Yes, it is free and needs no sign-up. The free tier handles up to 5 files at a time; Pro removes that limit and adds ZIP downloads.
Is the first conversion slower?
The video engine loads once (a few seconds), then stays cached for the next conversions.
Are my files private?
Yes. The conversion runs entirely in your browser; your files are never uploaded to a server.