MP4 to MKV Converter

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

1. Upload your MP4 video files
2. Choose video quality (High Quality recommended)
3. Click "Convert to MKV"
4. 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