Convert MP4 to MKV Online - Free Video Converter
Convert MP4 video files to MKV format with Reformatly. MKV is a flexible container format that supports multiple audio tracks, subtitles, and chapters.
Why Convert MP4 to MKV?
- Multiple Audio Tracks: MKV supports multiple audio tracks in one file
- Subtitle Support: Embed multiple subtitle tracks
- Chapter Markers: Add chapter markers for navigation
- Open Format: Free and open container format
How to Convert MP4 to MKV
- Upload your MP4 video files
- Choose video quality (High Quality recommended)
- Click "Convert to MKV"
- Download your converted MKV files
Features
- ✓ Batch conversion - convert multiple MP4 files
- ✓ High quality video output
- ✓ Fast conversion with H.264 encoding
- ✓ Maintains video and audio quality
- ✓ Progress tracking for each file