AIFF to AAC Converter
Convert AIFF to AAC free — no upload, no signup
To convert AIFF to AAC, drop your AIFF 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. Compress AIFF to raw AAC.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
Advanced
How to convert AIFF to AAC
Add your AIFF files
Drag and drop AIFF files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Pick a bitrate
192 kbps suits music and 128 kbps or less suits speech. Sample rate and mono/stereo are under Advanced.
Convert and download
Click Convert, then download each AAC file or all of them as one ZIP.
Why convert AIFF to AAC?
Streaming encoders and broadcast tools often accept AAC.
What happens when you convert AIFF to AAC?
Encoded to AAC at 160 kbps, about 90% smaller.
How does Fylo convert AIFF to AAC?
Fylo decodes the PCM audio in the AIFF with ffmpeg compiled to WebAssembly and encodes it with FFmpeg's AAC encoder at 160 kbps, written as a raw ADTS stream. Going from lossless to lossy is where the big saving happens: a 3-minute song is ≈ 32 MB as AIFF but ≈ 3.6 MB at 160 kbps as AAC. The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between AIFF and AAC?
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.
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.
Learn more: AIFF format guide · AAC format guide
| Property | AIFF | AAC |
|---|---|---|
| Compression | None (PCM) | Lossy |
| Typical bitrate | 1,411 kbps (CD quality) | 96–256 kbps |
| 3-minute song | ≈ 32 MB | ≈ 3.6 MB at 160 kbps |
| Tags and cover art | Yes (ID3 chunk) | Limited in raw .aac (full in M4A) |
| Compatibility | macOS, iTunes, DAWs; less common on Windows | Very wide: Apple, Android, YouTube, browsers |
| Best for | Mac audio editing and music production | Efficient music and video soundtracks |
| Introduced | 1988 | 1997 |
Frequently asked questions
M4A or AAC?
M4A for libraries.
Quality?
Transparent for most listeners at 160 kbps.
Is my AIFF file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your AIFF file is read directly from your device and never sent anywhere.
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