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Download App for only $15FLAC is a lossless audio format beloved by audiophiles for its perfect reproduction of sound, 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 FLAC 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 FLAC file above, hit convert, and download your MKV output immediately.