Convert Advanced Audio Coding (.aac) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registration.
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Click Convert and download your .aiff file when it's ready.
AAC delivers excellent audio quality at compressed bitrates, powering iTunes and YouTube. AIFF (Audio Interchange File Format), created by Apple in 1988, stores uncompressed PCM audio at full CD quality or higher. Converting AAC to AIFF decodes the compressed AAC data back to raw PCM samples, producing a lossless file suitable for professional editing in Logic Pro, GarageBand, or Pro Tools on macOS.
Professional audio editors require uncompressed input to avoid compounding artifacts during processing. When you apply effects, normalize levels, or time-stretch audio in a DAW, starting from a compressed AAC file causes generation loss with each edit cycle. AIFF provides the uncompressed PCM baseline that DAWs expect. Additionally, AIFF is the native import format for many Mac-based studio workflows.
FFmpeg decodes the AAC stream (whether AAC-LC, HE-AAC, or HE-AACv2) to PCM signed 16-bit or 24-bit samples, then writes them into the AIFF container using big-endian byte order. The output sample rate matches the source (typically 44.1 kHz or 48 kHz). A 4-minute AAC track at 256 kbps (~8 MB) expands to roughly 40 MB as 16-bit 44.1 kHz AIFF.
The conversion itself is lossless — every sample decoded from AAC is preserved exactly in AIFF. However, AIFF cannot restore information discarded during the original AAC encoding. The resulting AIFF will sound identical to the AAC source but will not match the quality of the pre-compression original. Think of it as a perfect snapshot of what AAC preserved.
| Device | AAC | AIFF |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| 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
Converting AAC to AIFF is the standard way to prepare compressed audio for professional editing on Apple platforms. The output is uncompressed and ready for any DAW, though the audio fidelity ceiling remains at whatever the AAC encoder originally preserved.
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| No |
| Funktion | AAC | AIFF |
|---|---|---|
| Fulde navn | Advanced Audio Coding | Audio Interchange File Format |
| Filendelse | .aac | .aiff |
| Bedst til | Superior to MP3 | Lossless quality |