AAC to AIFF Converter
Convert AAC to AIFF free — no upload, no signup
To convert AAC to AIFF, drop your AAC audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Decode AAC to AIFF for Mac audio apps.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
AIFF is lossless — no bitrate to choose. Sample rate and channels are under Advanced.
Advanced
How to convert AAC to AIFF
Add your AAC files
Drag and drop AAC files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Check the settings
AIFF is lossless, so there's no bitrate to pick. Change sample rate or switch to mono under Advanced if a device needs it.
Convert and download
Click Convert, then download each AIFF file or all of them as one ZIP.
Why convert AAC to AIFF?
Logic Pro and GarageBand import AIFF directly for editing.
What happens when you convert AAC to AIFF?
The AAC is decoded to 16-bit PCM AIFF, about 10 MB per minute.
How does Fylo convert AAC to AIFF?
Fylo decodes the AAC audio in the AAC with ffmpeg compiled to WebAssembly and encodes it with 16-bit big-endian PCM with no compression. Nothing is added back: the AIFF is an exact but larger copy of the decoded AAC (≈ 32 MB for a 3-minute song versus ≈ 3.6 MB at 160 kbps). The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between AAC and AIFF?
AAC (Advanced Audio Coding) was standardised in 1997 as part of MPEG-2 and later MPEG-4, designed to replace MP3. It achieves better quality at the same bitrate, especially below 128 kbps. A .aac file is usually a raw ADTS stream; the same audio inside an MP4 container is called M4A.
AIFF (Audio Interchange File Format) was created by Apple in 1988, based on Electronic Arts' IFF format. Like WAV it stores uncompressed PCM audio — just with big-endian byte order — so the two contain identical sound data at the same settings.
Learn more: AAC format guide · AIFF format guide
| Property | AAC | AIFF |
|---|---|---|
| Compression | Lossy | None (PCM) |
| Typical bitrate | 96–256 kbps | 1,411 kbps (CD quality) |
| 3-minute song | ≈ 3.6 MB at 160 kbps | ≈ 32 MB |
| Tags and cover art | Limited in raw .aac (full in M4A) | Yes (ID3 chunk) |
| Compatibility | Very wide: Apple, Android, YouTube, browsers | macOS, iTunes, DAWs; less common on Windows |
| Best for | Efficient music and video soundtracks | Mac audio editing and music production |
| Introduced | 1997 | 1988 |
Frequently asked questions
Does converting AAC to AIFF improve quality?
No. AAC is lossy, so detail removed during its compression can't be restored. The AIFF is a lossless copy of what the AAC sounds like — bigger, but not better.
Can GarageBand open AAC directly?
It can import M4A; AIFF avoids any decoding issues.
Is my AAC file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your AAC file is read directly from your device and never sent anywhere.
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