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Download App for only $15MP4 is the most widely supported video format, compatible with virtually every device and platform, while MKV (Matroska) is a flexible open container that supports multiple audio, video, and subtitle tracks. This conversion is frequently needed for editing software compatibility, social media uploads, device playback, or reducing file size without sacrificing quality. MediaForge handles MP4 to MKV conversion directly in your browser via FFmpeg compiled to WebAssembly — no file size limits, no cloud uploads, and no registration required. Drop your MP4 file above, hit convert, and download your MKV output immediately.