Convert AIFF-C Compressed Audio (.aifc) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or registration.
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Choose your output settings. The default settings work great for most files.
Click Convert and download your .aac file when it's ready.
AIFC (AIFF-C) is Apple's compressed variant of the Audio Interchange File Format, supporting codecs like IMA ADPCM, MACE 3:1/6:1, u-law, A-law, and uncompressed PCM. It was the standard compressed audio format on classic Mac OS and NeXTSTEP before AAC and MP3 became dominant. Most modern audio software cannot open AIFC files, making them effectively trapped in legacy archives.
AAC (Advanced Audio Coding) is the successor to MP3 and the default lossy audio codec across Apple devices, YouTube, Android, and all major streaming platforms. Converting AIFC to AAC modernizes legacy Apple audio into a universally playable format with excellent quality-to-size ratio. At 256 kbps, AAC delivers perceptually transparent audio from a clean PCM or ADPCM source.
AIFC has virtually no playback support on any modern platform — you cannot open AIFC files on an iPhone, in a web browser, or on Android without specialized software. AAC, by contrast, plays natively on every Apple device, every Android device, and in every modern browser. Converting AIFC to AAC makes your legacy Mac audio accessible everywhere.
For AIFC files containing uncompressed PCM, the conversion to AAC achieves roughly 80% file size reduction at 256 kbps with virtually no audible quality loss. Even AIFC files using MACE compression benefit from the conversion, since AAC's psychoacoustic model is vastly superior to the crude waveform coding in MACE 3:1 or 6:1.
FFmpeg identifies the AIFC compression type (NONE for PCM, ima4 for IMA ADPCM, MAC3/MAC6 for MACE, ulaw/alaw for G.711) and decodes to raw PCM samples. The AAC encoder (libfdk_aac or FFmpeg native) applies psychoacoustic modeling to allocate bits across frequency bands, producing an AAC-LC bitstream. The output is wrapped in an M4A (MPEG-4 Audio) container with full metadata support including artist, album, and cover art fields.
For AIFC files containing uncompressed PCM, AAC at 256 kbps produces perceptually transparent output — indistinguishable from the source in blind tests. AIFC files using IMA ADPCM (4:1 compression) already have some quantization noise; the AAC encoder preserves this faithfully without adding significant further degradation. MACE-compressed AIFC files are the most degraded sources, but AAC still encodes them efficiently. The single encoding step from AIFC to AAC avoids the generation loss that would occur from transcoding through an intermediate format.
| Device | AIFC | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| 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 AAC is the definitive path for modernizing legacy Apple compressed audio. AAC's universal support and superior compression make it the ideal successor to every codec stored in AIFC containers.
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| No |
| Fitur | AIFC | AAC |
|---|---|---|
| Nama Lengkap | AIFF-C Compressed Audio | Advanced Audio Coding |
| Ekstensi | .aifc | .aac |
| Terbaik Untuk | Compressed AIFF | Superior to MP3 |