AIFF to AAC Converter

Convert AIF to AAC Online

An .aif file is uncompressed PCM audio in Apple's Audio Interchange File Format — the same thing as .aiff, just the three-letter spelling — and it eats roughly 10 MB per minute. This converter re-encodes that bulky master to AAC, the compact format that plays natively on iPhones, Android, browsers, car stereos, and every streaming app. Because a clean AIF is a lossless original, the AAC you get is a first-generation encode with no inherited artifacts.

How to Convert AIF to AAC

1. Upload Your AIF File: Drag and drop your .aif or .aiff file onto the page, or click "+ Add Files" to browse. Queue several at once to convert them all with the same settings.
2. Pick a Quality Preset: Leave Quality Preset on "Very High (Recommended)" for transparent music, or open the dropdown (Highest down to Lowest) to trade size against fidelity.
3. Set the Bitrate (Optional): Open File Compression to choose Constant Bitrate for a predictable file size or Variable Bitrate for better quality per byte; you can also cap a Specific file size. Mono speech sources do fine at 96 kbps.
4. Convert and Download: Click "Convert" and download each AAC individually or grab them all as a ZIP. No sign-up, no watermark.

Choosing an AAC Bitrate

Frequently Asked Questions

Will I lose quality converting AIF to AAC?

AAC is a lossy format, so the encode discards data the original PCM held — but because a real .aif is an uncompressed, lossless master, this is a clean first-generation encode with no artifacts carried over from a previous compression. At 256 kbps from a 44.1 kHz source it's effectively transparent for most listeners, and 128 kbps is the long-standing "good enough" streaming default. The catch is that re-encoding AAC again later stacks loss, so keep the AIF as your master if you'll edit or remaster.

Should I keep the original AIF file after converting?

Yes, if you plan to edit, remaster, or re-export the audio. AAC is a delivery format: it's lossy and built for playback and distribution, not for repeated round-trips through an editor. Your .aif is the lossless original, so archive it and treat the AAC as a disposable export you can regenerate anytime at whatever bitrate a given device or platform needs.

Why does my AIF play on my Mac but not on Windows or Android?

AIFF originated with Apple in 1988, so macOS, iOS, QuickTime, and the Music app open .aif natively, while many Windows players, Android apps, and web players don't register the extension. AAC, by contrast, is decoded almost everywhere — iOS, Android, Chrome, Firefox, Edge, Safari, cars, and smart speakers — so converting makes the audio portable without anyone installing a codec.

Is AAC better than MP3 for this?

AAC was standardized in 1997 (MPEG-2 Part 7, later folded into MPEG-4) specifically as MP3's successor, and it generally sounds better at the same bitrate — the gap is clearest below 128 kbps and narrows to inaudible at 256 kbps and up. Choose AAC when your targets are Apple devices, modern phones, browsers, or streaming. If you instead need maximum playback compatibility on very old hardware, use AIF to MP3. For the same AAC audio in Apple's tagged container, see AIF to M4A.

Are my files private when I convert them here?

Yes. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. In our testing, a 3-minute stereo AIF ripped from a CD (about 31 MB of PCM) encoded to a 256 kbps AAC of roughly 5.7 MB. If your source uses the four-letter spelling, AIFF to AAC is the identical conversion.