Convert AIFC to 3GP — Free Online Converter

AIFC (AIFF-C, Audio Interchange File Format - Compressed) is an extension of Apple's AIFF standard that adds support for compressed audio codecs including IMA ADPCM, MACE 3:1, MACE 6:1, and ITU-T G.711 variants (u-law and A-law). Despite the 'compressed' designation, AIFC can also store uncompressed PCM data and is primarily encountered in legacy Mac OS applications, NeXTSTEP systems, and vintage multimedia projects from the early 1990s.

3GP is a lightweight multimedia container standardized by the 3rd Generation Partnership Project for mobile phone networks. Converting AIFC to 3GP takes a rare legacy Apple audio format and repackages the audio into a mobile-optimized container using AMR or low-bitrate AAC codecs. The resulting file is audio-only wrapped in the 3GP video container, suitable for legacy mobile playback and MMS delivery.

AIFC files are essentially unplayable on modern mobile devices — no mainstream mobile OS includes an AIFC decoder. The format's compressed codecs (MACE, IMA ADPCM) are proprietary Apple technologies from the early 1990s with virtually zero support outside classic Mac OS. 3GP, by contrast, was built specifically for mobile delivery and is recognized by every feature phone and smartphone.

Converting AIFC to 3GP also achieves significant file size reduction when the AIFC source contains uncompressed PCM. Even AIFC files using MACE 6:1 compression (roughly 6:1 ratio) are still far larger than 3GP with AMR-NB, which compresses speech audio to under 100 KB per minute. For transmitting legacy Mac audio over cellular networks, 3GP is the practical target.