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Convert MP4 videos to MKV format to take advantage of MKV's superior container features.
Upload your MP4 file, click Convert, and download the MKV output. Streams are remuxed without re-encoding.
Upload your MP4
Drop an .mp4 file onto the upload area.
Convert
Click "Convert to MKV". FFmpeg remuxes the MP4 into the MKV container without re-encoding the video stream.
Download
Save the MKV file. MKV supports multiple audio tracks, subtitles, and chapters that MP4 may not.
Multiple Subtitle Tracks
Convert MP4 to MKV to embed multiple subtitle languages in a single file — MP4 has limited subtitle support.
Multiple Audio Tracks
MKV supports multiple audio streams (e.g. original + dubbed) in one file — ideal for multilingual content.
Plex & Jellyfin Server
Home media servers like Plex and Jellyfin prefer MKV for its richer metadata and multi-track support.
Kodi & HTPC
Kodi and home theater PC setups benefit from MKV's chapter markers and metadata over plain MP4.
Video Archiving
MKV is an open, patent-free container — ideal for long-term video archiving without licensing concerns.
Chapter Markers
Add chapter points to your video that MP4 can't cleanly support — MKV handles chapters natively.
Lossless Stream Copy
MP4 streams are remuxed into the MKV container without re-encoding — zero quality loss, instant conversion.
Open & Patent-Free
MKV (Matroska) is an open-source container with no patent restrictions — safe for all uses.
100% Browser-Based
FFmpeg WebAssembly processes your MP4 locally — no server upload, complete privacy.
Multi-Track Support
MKV output supports multiple audio, subtitle, and chapter tracks not available in standard MP4.
No File Size Limits
Local processing means no server-enforced upload restrictions on your MP4 files.
Free to Start — Sign Up for More
Use free with no account for files up to 40 MB. Sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB per file.
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All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.
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