Convert AVI to ALAC — Free Online Converter

AVI files from camcorders, screen recorders, and legacy editing software often contain audio encoded as PCM, MP3, or AC3. ALAC (Apple Lossless Audio Codec) is Apple's lossless compression format, introduced in 2004 and open-sourced in 2011. ALAC achieves roughly 50% compression of PCM data with bit-perfect reconstruction — every sample is identical on playback. Converting AVI to ALAC extracts the audio track and compresses it losslessly in an M4A container recognized by iTunes, Apple Music, and all iOS devices.

ALAC combines the quality guarantee of uncompressed PCM with file sizes roughly half as large, making it the optimal format for Apple ecosystem users who want lossless audio without the storage penalty. If you are building an iTunes library from AVI video recordings or need lossless audio for Apple-based music production, ALAC is the native choice — it plays seamlessly on every iPhone, iPad, Mac, Apple TV, and HomePod.

The conversion process demuxes the AVI file to extract the raw audio stream, decodes it to PCM (if compressed), then encodes to ALAC using FFmpeg's native ALAC encoder. The output is wrapped in an M4A (MPEG-4 Part 14) container. ALAC preserves the original sample rate (typically 44.1 kHz or 48 kHz), bit depth (16-bit or 24-bit), and channel layout. Compression ratio is typically 40–60% depending on audio content complexity — simple spoken word compresses more than dense orchestral music.