Convert AVI to AAC — Free Online Converter

AVI files frequently contain audio tracks encoded in PCM (uncompressed), MP3, or AC3, wrapped inside Microsoft's RIFF-based container. AAC (Advanced Audio Coding) is the successor to MP3, standardized in MPEG-2 Part 7 and MPEG-4 Part 3, offering superior sound quality at equivalent bitrates. Extracting and converting AVI audio to AAC produces a compact, high-fidelity audio file compatible with virtually every modern device and platform — from iPhones to web browsers.

When you only need the audio from a video — a music performance, podcast interview, or lecture recording stored as AVI — converting to AAC gives you a standalone audio file at roughly half the size of MP3 at the same perceptual quality. AAC is the default audio codec for iTunes, Apple Music, YouTube, and most streaming services, making it the most universally supported lossy audio format today.