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Download App for only $15AVI is a classic Microsoft container format with broad software compatibility, while AAC is Apple's Advanced Audio Codec offering better quality than MP3 at the same bitrate. This conversion is frequently needed for editing software compatibility, social media uploads, device playback, or reducing file size without sacrificing quality. MediaForge handles AVI to AAC conversion directly in your browser via FFmpeg compiled to WebAssembly — no file size limits, no cloud uploads, and no registration required. Drop your AVI file above, hit convert, and download your AAC output immediately.