Convert AIF to M4A — Free Online Converter

AIF is Apple's uncompressed PCM audio format from 1988, storing big-endian audio data in an IFF-derived container. As the classic Mac OS standard for high-fidelity audio, AIF preserves every sample at full quality. M4A is the audio-only MPEG-4 container that holds either AAC (lossy) or ALAC (lossless) audio — it is the modern Apple audio standard used by iTunes, Apple Music, iPhone recordings, GarageBand exports, and Voice Memos.

Converting AIF to M4A moves audio from Apple's legacy uncompressed format to Apple's modern container. The M4A container supports both lossy AAC (for small files) and lossless ALAC (for perfect preservation), making this a flexible upgrade path that keeps your audio within the Apple ecosystem while gaining better metadata support, smaller file sizes, and universal Apple device playback.

M4A with AAC at 256 kbps reduces AIF's ~10 MB/minute to approximately 2 MB/minute — an 80% size reduction with virtually transparent quality. M4A with ALAC reduces to ~5 MB/minute while preserving every sample losslessly. Either way, M4A offers significant space savings over AIF's raw uncompressed PCM.

M4A also provides superior metadata capabilities over AIF. The MPEG-4 container supports embedded album art, lyrics, chapter markers, gapless playback flags, iTunes rating/grouping tags, and Soundcheck data — none of which AIF's simple AIFF container can match. For Apple ecosystem users, M4A is the strictly superior format in every dimension.