Convert AIFF-C Compressed Audio (.aifc) to 3GPP Multimedia (.3gp) online for free. Fast, secure audio conversion with no watermarks or registration.
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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.
FFmpeg reads the AIFC container and identifies the internal codec — PCM (uncompressed), IMA ADPCM (4-bit adaptive differential), MACE 3:1, MACE 6:1, u-law, or A-law. It decodes the audio to raw PCM samples regardless of the original compression, then re-encodes as AMR-NB (8 kHz mono, 4.75-12.2 kbps), AMR-WB (16 kHz mono, up to 23.85 kbps), or AAC-LC at a low bitrate. The result is muxed into a 3GP container conforming to the 3GPP specification.
Quality depends heavily on the AIFC source codec. Uncompressed PCM in AIFC provides a perfect starting point, but 3GP's codecs impose severe constraints. MACE-compressed AIFC sources are already degraded before the 3GP encoding step, compounding the quality loss. AMR-NB limits audio to telephone bandwidth (300-3400 Hz), while AAC-LC at 64-128 kbps in 3GP preserves more detail. For speech content, the result is acceptable; for music, quality loss is substantial.
| Device | AIFC | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AIFC to 3GP rescues audio trapped in Apple's obsolete compressed format and delivers it in a universally recognized mobile container. Prefer AAC-LC inside 3GP for the best quality, and always retain original AIFC files as archival copies.
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| No |
| Funktion | AIFC | 3GP |
|---|---|---|
| Fullstandigt namn | AIFF-C Compressed Audio | 3GPP Multimedia |
| Filandelse | .aifc | .3gp |
| Bast for | Compressed AIFF | Mobile optimized |