MP4 to MKV Converter

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How to Convert MP4 to MKV Online

1. Upload your MP4 video

Click "Upload file" or drag and drop your MP4 file directly into the converter
2. Choose MKV as output

MKV format is selected by default. All audio tracks and subtitles will be preserved automatically
3. Download your MKV file

Click "Convert" and download your MKV video. Ready for Plex, Kodi, VLC, or your media library!

Multiple audio & subtitle tracks

MKV supports unlimited audio and subtitle tracks in one file. Perfect for multilingual movies, anime with dual audio, or films with director's commentary.
Perfect for Plex & Kodi

MKV is the preferred format for media servers like Plex, Kodi, Jellyfin, and Emby. Build your movie library with full metadata, chapters, and artwork support.
No software installation

Convert MP4 to MKV directly in your browser — on desktop, laptop, tablet, or phone. 100% free, no registration required.

Find more tools to speed up video creation and boost quality.

MKV supports unlimited audio tracks, subtitles, and chapters in one file. It's the best container for movies, anime, and TV shows — especially for media servers like Plex and Kodi.
Both use the same video codecs (H.264/H.265). MKV is more flexible — it supports unlimited audio/subtitle tracks, chapters, and attachments. MP4 is more universally compatible but limited in features.
Yes! Our MP4 to MKV converter is completely free with no hidden fees. Convert unlimited files without watermarks or registration.
Yes! All embedded subtitles and audio tracks are preserved during conversion. MKV can hold multiple subtitle tracks (SRT, ASS, SSA) in different languages.
Most modern smart TVs, Roku, Fire TV, and streaming devices support MKV playback. For older devices, use Plex or VLC to stream MKV files.
Yes! Our converter works on all devices — iPhone, iPad, Android, Windows, and Mac. Just use your mobile browser.