How to use the MKV to MP4
- Add your .mkv file.
- MP4 is preselected. Pick a quality.
- Press “Convert” and download the MP4.
MKV vs MP4
Both are containers. MKV can hold many audio and subtitle tracks, while MP4 is supported by practically every device and platform. Converting re-encodes the main video and audio track into the most compatible MP4 format.
Large MKV files
Because conversion runs on your own device, very long movies take time. Files up to 500 MB are supported; for bigger files, desktop software such as HandBrake or FFmpeg is a better fit.
How the converter works
Conversion runs in your browser with FFmpeg (WebAssembly), so your file is not uploaded. The first conversion downloads the converter engine (about 30 MB) once; files up to 500 MB are supported.
Frequently asked questions
Are subtitles kept?
Only the main video and audio tracks are converted. Embedded subtitle tracks are not carried over.
Is MKV to MP4 free here?
Yes, completely free with no watermark and no signup.
How long does it take?
Roughly as long as the video plays, often longer on phones. Choose “Small file” for faster results.