Convert AIF to AMR — Free Online Converter

AIF is Apple's uncompressed audio format from 1988, storing big-endian PCM data in an IFF-derived container at full CD quality (16-bit, 44.1 kHz) or higher. Developed for professional and archival use on classic Mac OS, AIF preserves every audio sample without any compression or quality loss. AMR (Adaptive Multi-Rate) is a narrowband speech codec standardized by 3GPP, designed for GSM and 3G mobile networks.

Converting AIF to AMR transcodes high-fidelity uncompressed audio into a highly compressed speech-optimized format. AMR operates at 8 kHz sampling rate with bitrates between 4.75 and 12.2 kbps, making it roughly 100-200 times smaller than the AIF source. This extreme compression is designed exclusively for speech and is not suitable for music.

AMR is the standard codec for mobile voice recordings, voicemail systems, and GSM voice messaging. If you have AIF recordings of speech, interviews, or voice memos from Mac systems, converting to AMR makes them compatible with mobile telephony infrastructure and messaging systems that expect AMR-encoded audio.

The extreme compression ratio (a 10 MB AIF minute becomes ~60 KB in AMR) makes this conversion essential for bandwidth-constrained delivery like MMS, VoIP systems, and legacy mobile platforms. Starting from AIF's uncompressed PCM ensures the AMR encoder has the cleanest possible source, producing the best achievable speech quality within AMR's narrow bandwidth.