MKV to MP4 Converter — Free Online

Upload your MKV file above and click "Convert to MP4". When the MKV already contains H.264 video — which is the case for most movie files — our converter remuxes the stream directly into MP4 without re-encoding. This means zero quality loss and near-instant conversion.

Yes, VLC can convert MKV to MP4 via Media → Convert/Save, but it re-encodes the video which takes a long time and can reduce quality. Our online converter is faster because it stream-copies the existing H.264 video directly into the MP4 container — no re-encoding needed for most MKV files.

MKV is not natively supported by iOS, most smart TV firmware, or streaming apps like Netflix and Disney+. Converting to MP4 fixes this immediately — the resulting file will play on any iPhone, smart TV, Roku, Fire TV, or gaming console without extra apps.

Embedded subtitle tracks (soft subs) in MKV are not carried over to MP4. The main video and audio tracks are preserved at full quality. If you need subtitles, extract them as an SRT file before converting.

Both often contain the same H.264 video codec — the difference is the container. MKV supports multiple audio tracks, subtitles, and chapters in one file, but has poor device compatibility. MP4 is simpler and universally supported on every device, platform, and app.

You can convert files up to 1GB without an account. Enter your email to unlock up to 2GB, or sign up for a free vitelnk trial to convert files up to 5GB — enough for most full-length movie files.

Yes. Both PlayStation and Xbox support MP4 playback natively via USB or media apps. MKV support varies by console and app and is often unreliable — MP4 is the safer choice.

Yes — this tool runs entirely in your browser, so it works on any device and operating system: Mac, Windows, Linux, iPhone (Safari/Chrome), and Android. No software download or installation needed.