Convert AIFF to AAC — Free Online Converter
Convert Audio Interchange File Format (.aiff) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or reg...
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Upload your .aiff 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 .aac file when it's ready.
About AIFF to AAC Conversion
AIFF stores uncompressed PCM audio at full quality, consuming about 10 MB per minute of CD-quality stereo. AAC (Advanced Audio Coding) compresses that same audio to roughly 2 MB per minute at 256 kbps while remaining perceptually transparent to most listeners. Converting AIFF to AAC is the standard workflow for preparing studio masters for digital distribution — the iTunes Store, Apple Music, YouTube, and Spotify's ingest pipeline all accept or use AAC.
Why Convert AIFF to AAC?
Uncompressed AIFF files are impractical for distribution. A 50-song album in AIFF takes about 3 GB, while the same album in AAC at 256 kbps fits in roughly 600 MB. AAC encoding at 256 kbps (Apple's iTunes Plus quality) is audibly indistinguishable from the AIFF source in double-blind tests. Every major platform, device, and browser supports AAC playback, making it the universal distribution format.
Common Use Cases
- Mastering an album from AIFF studio files to AAC for iTunes Store and Apple Music distribution
- Compressing AIFF field recordings for podcast publishing in AAC format
- Reducing the size of an AIFF music library for portable device storage
- Creating AAC audio assets for mobile app development from AIFF source recordings
- Encoding AIFF voice-over narration to AAC for YouTube video soundtracks
How It Works
FFmpeg reads the AIFF's PCM stream (16-bit or 24-bit, typically 44.1 or 48 kHz) and encodes using AAC-LC via the native FFmpeg encoder or libfdk_aac (higher quality). Standard encoding profiles: 128 kbps for speech/podcasts, 192 kbps for general music, 256 kbps for high-fidelity distribution. The output is wrapped in an M4A container with metadata from AIFF ID3 tags or embedded chunks.
Quality & Performance
AAC at 256 kbps is considered perceptually lossless for the vast majority of listeners. At 192 kbps, most listeners cannot detect artifacts on typical playback equipment. At 128 kbps, trained listeners may notice slight high-frequency softening on complex material. Since the source is uncompressed AIFF, there is no generational loss issue — this is first-generation compression.
Device Compatibility
| Device | AIFF | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| 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
- 1Use 256 kbps AAC-LC for music distribution — this matches Apple's iTunes Plus quality standard
- 2For podcasts, 128 kbps stereo or 64 kbps mono AAC-LC is sufficient and saves bandwidth for listeners
- 3Enable two-pass encoding if available for the most efficient bitrate usage at your target quality
- 4Preserve the AIFF originals as your masters — AAC is for distribution, AIFF is for archival
Related Conversions
AIFF to AAC is the fundamental mastering-to-distribution conversion in the Apple ecosystem. At 256 kbps, you get 80% size reduction with essentially transparent quality. It is the single most important audio conversion for music distribution.