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Download App for only $15AAC is Apple's Advanced Audio Codec offering better quality than MP3 at the same bitrate, 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 AAC 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 AAC file above, hit convert, and download your MKV output immediately.