AVI to FLAC Converter — Free, Online, No Upload

AVI files that came from high-quality capture cards or lossless recording setups sometimes carry uncompressed PCM audio — but that quality is invisible once the file is sitting in an AVI container that audiophile software, music servers, and archival tools often refuse to parse. Getting that audio into a proper lossless format is necessary before it can be used in serious audio workflows.

FLAC is the standard for lossless audio archiving. It compresses audio with no quality loss — every sample is preserved exactly — while reducing file sizes by 40–60% compared to raw WAV. Plex, Jellyfin, Kodi, foobar2000, and Audirvana all support FLAC natively. It is the format of choice for music collectors, archivists, and anyone running a high-quality home audio server.

Extracting audio from AVI to FLAC is straightforward: if the AVI contains uncompressed PCM, the FLAC output is a mathematically perfect copy in a better container. If the AVI uses a lossy codec like MP3, the FLAC output preserves that signal without further degradation, but does not restore quality the original compression removed. FLAC files are large compared to MP3 or AAC but far more appropriate for archival use. This is the right choice when you want audio you never have to convert again.

Typical sizes: AVI 200–600 MB (1 minute 1080p); FLAC 20–40 MB (3-minute song).

FLAC will not restore detail the AVI encoder removed, and the file gets bigger.