Convert videos to any format
Drag & drop video file here
Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your MP4 video
Automatic conversion with optimal settings
Save your converted MKV file
MKV supports multiple audio tracks, subtitles, and chapters that MP4 cannot handle as flexibly. Convert to MKV when you need to embed multiple languages or preserve complex media structure.
MP4 is the most widely used video container format, supporting H.264, H.265/HEVC, and AV1 codecs. It offers excellent compatibility across all devices, browsers, and platforms while maintaining a good balance between file size and quality.
MKV is a flexible, open-standard container format that can hold an unlimited number of video, audio, subtitle, and metadata tracks. It's the preferred format for high-quality video archival and media collections.
MP4 is ideal for sharing and streaming with universal support. MKV is better for archival and multi-track content. MP4 has smaller overhead, MKV has more flexibility.
Common scenarios for this conversion
Convert MP4 to MKV when your device or app doesn't support the original format.
Upload MKV instead of MP4 for better support on YouTube, Instagram, and TikTok.
Convert to MKV for seamless import into professional editing software.
Play MP4 files on any phone by converting to MKV.
Your files never leave your device. All conversion happens in your browser — no server uploads.
Hardware-accelerated conversion powered by WebCodecs and WebAssembly.
Convert between any video format combination.