Convert AAC to AIFF — Free Online Converter
Convert Advanced Audio Coding (.aac) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or reg...
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Upload your .aac 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 .aiff file when it's ready.
About AAC to AIFF Conversion
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.
Why Convert AAC to AIFF?
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.
Common Use Cases
- Importing AAC podcast episodes into Logic Pro for mastering and mixing
- Preparing AAC music tracks for DJ software that requires uncompressed input
- Creating AIFF reference files for audio quality comparison testing
- Loading compressed recordings into Pro Tools sessions for post-production
- Generating CD-quality masters from AAC source material when the original WAV is unavailable
How It Works
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.
Quality & Performance
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 Compatibility
| Device | AAC | AIFF |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tips for Best Results
- 1Choose 24-bit output if your DAW works in 24-bit sessions, even though the AAC source is typically 16-bit — it avoids unnecessary bit-depth conversion later
- 2Match the sample rate to your project settings (44.1 kHz for music, 48 kHz for video) to prevent automatic resampling in your DAW
- 3Use AIFF-C (compressed variant) only if you need Apple compatibility with some size savings — otherwise stick with standard AIFF for maximum editor support
- 4Keep the original AAC file as a backup, since the AIFF will be 5-10x larger and take more storage
Related Conversions
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.