Convert AIF to AAC — Free Online Converter

AIF is Apple's uncompressed audio format from 1988, storing PCM audio data in big-endian byte order within an IFF-derived container. As the Mac counterpart to WAV, AIF files preserve every audio sample at full fidelity, typically at 16-bit/44.1 kHz for CD-quality content or 24-bit/96 kHz for professional recordings. The three-character .aif extension was favored on classic Mac OS for cross-platform file system compatibility.

AAC (Advanced Audio Coding) is the successor to MP3 and the default lossy codec across Apple devices, YouTube, and most streaming platforms. Converting AIF to AAC compresses uncompressed PCM into a perceptually transparent lossy format, achieving roughly 10:1 compression at 256 kbps with virtually indistinguishable quality for most listeners.

AIF files at CD quality consume approximately 10 MB per minute, making them impractical for portable devices, streaming, and everyday listening. AAC at 256 kbps delivers transparent quality at roughly 2 MB per minute — an 80% size reduction. For a typical album, that means shrinking from 600 MB to 120 MB without audible quality loss.

AAC is natively supported on every Apple device, Android, web browsers, and all major streaming platforms. AIF, while lossless, requires specific codec support that many non-Apple systems lack. Converting AIF to AAC creates universally playable files while preserving the highest possible quality from the uncompressed source.