Convert AIFC to AMR — Free Online Converter

AIFC (AIFF-C) is Apple's compressed audio interchange format, a legacy container from classic Mac OS that supports IMA ADPCM, MACE 3:1/6:1, G.711 u-law/A-law, and uncompressed PCM audio. AMR (Adaptive Multi-Rate) is a speech-optimized codec developed by the European Telecommunications Standards Institute for GSM cellular networks, encoding voice at bitrates from 4.75 to 12.2 kbps.

Converting AIFC to AMR takes legacy Mac audio and encodes it into the most compact speech codec in common use. The output is a standalone AMR file (.amr) designed for voice recording apps, MMS messaging, and cellular voice infrastructure. This conversion is exclusively practical for speech content — AMR's narrow bandwidth destroys musical fidelity.

AIFC files cannot be played, shared, or processed by any modern mobile or telephony system. AMR, despite being narrowband, remains the standard voice recording format on many Android devices and is universally accepted by MMS gateways and voicemail servers worldwide. If you have legacy AIFC voice recordings that need to enter the cellular ecosystem, AMR is the target format.

The file size reduction is extreme. A one-minute AIFC file with uncompressed PCM at CD quality occupies roughly 10 MB. The same minute in AMR at 12.2 kbps is approximately 90 KB — a 100:1 compression ratio. Even MACE-compressed AIFC is several times larger than AMR. For bandwidth-constrained delivery, AMR is unmatched.