Audio Conversion
Convert AIFC to M4A — Free Online Converter
Convert AIFF-C Compressed Audio (.aifc) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
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Convert AIFF-C Compressed Audio (.aifc) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .aifc file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
AIFC (AIFF-C) is Apple's compressed audio interchange format from the classic Mac OS era, supporting IMA ADPCM, MACE 3:1/6:1, G.711, and uncompressed PCM. M4A (MPEG-4 Audio) is Apple's modern audio container, the successor format used across iTunes, Apple Music, iPhone, iPad, and the entire Apple ecosystem. M4A wraps either AAC lossy or ALAC lossless audio.
Converting AIFC to M4A is the natural upgrade path within Apple's own format lineage. It takes audio from Apple's oldest compressed container and places it in Apple's newest, ensuring native playback on every modern Apple device without any third-party software or codec installation.
AIFC was abandoned by Apple decades ago — no version of iOS, iPadOS, or modern macOS includes AIFC codec support for MACE or IMA ADPCM variants. M4A is Apple's current standard audio format with guaranteed long-term support across the entire ecosystem. Converting AIFC to M4A ensures your audio remains accessible on Apple hardware for the foreseeable future.
M4A also provides superior metadata support compared to AIFC. Album art, lyrics, chapter markers, and extensive tag fields are built into the MPEG-4 container. AIFC's metadata capabilities are limited to basic fields from the 1988 specification. M4A with AAC at 256 kbps is the standard for iTunes Store downloads and Apple Music offline caching.
FFmpeg decodes the AIFC container (PCM, IMA ADPCM, MACE, u-law, or A-law) to raw PCM samples. For lossy M4A, it encodes with AAC-LC at 128-320 kbps. For lossless M4A, it encodes with ALAC. The output is wrapped in an MPEG-4 (MP4) container with the .m4a extension and the moov atom placed at the beginning of the file (faststart) for efficient streaming. Metadata is mapped from AIFC tags to the MPEG-4 atom structure.
M4A with AAC at 256 kbps produces perceptually transparent output from uncompressed AIFC PCM sources — indistinguishable from the original in blind tests. M4A with ALAC preserves bit-perfect quality with 40-60% compression. For MACE-compressed AIFC sources, AAC at 192 kbps is more than sufficient since the source quality is already limited by MACE's crude compression algorithm.
| Device | AIFC | M4A |
|---|---|---|
| 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 M4A is Apple's own format evolution path — from the legacy compressed container to the modern standard. Choose AAC for compact distribution or ALAC for lossless archival within the M4A wrapper.
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| No |
| 特性 | AIFC | M4A |
|---|---|---|
| 全称 | AIFF-C Compressed Audio | MPEG-4 Audio |
| 扩展名 | .aifc | .m4a |
| 最适合 | Compressed AIFF | Better than MP3 |