Convert FLAC to AIFF — Free Online Converter

AIFF (Audio Interchange File Format) is Apple's uncompressed audio standard, created in 1988 based on Electronic Arts' IFF structure. Converting FLAC to AIFF produces a bit-identical PCM representation of the original audio, just wrapped in a different container. Both formats are lossless, so this conversion involves zero quality loss — it simply repackages the audio data for environments that require AIFF, particularly professional Mac-based audio workflows using Logic Pro, GarageBand, or Pro Tools.

Many professional DAWs on macOS default to AIFF as their working format. Logic Pro, GarageBand, and Final Cut Pro all treat AIFF as a first-class citizen. While FLAC is more space-efficient due to lossless compression (typically 50-60% of WAV size), AIFF stores uncompressed PCM data that can be read sequentially without decoding overhead — an advantage in low-latency recording and live performance scenarios. Some CD mastering workflows also require AIFF input.

FFmpeg decodes the FLAC stream to PCM and writes it into an AIFF container. The PCM data in AIFF is stored big-endian (network byte order), unlike WAV which uses little-endian. AIFF supports up to 32-bit sample depth and sample rates exceeding 192 kHz. The conversion preserves the original bit depth and sample rate exactly. AIFF-C (compressed variant) exists but is rarely used; this conversion produces standard uncompressed AIFF.