Convert AIFF to AAC Online Free
Convert uncompressed AIFF audio to AAC format for portable devices, streaming, and web distribution. FFmpeg encodes your lossless AIFF to high-quality AAC, significantly reducing file size.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts your AIFF to AAC using FFmpeg on secure servers. AAC delivers excellent audio quality at small file sizes and is natively supported on iPhone, Android, Apple TV, and all major streaming platforms. Converting from lossless AIFF gives AAC the best possible source quality. Files are auto-deleted after conversion, free with no signup.
Convert AIFF to AAC
Drop your AIFF file here to convert it instantly
Drag & drop your .aiff file here, or click to browse
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AIFF vs AAC: Format Comparison
Key differences between the two formats
| Feature | AIFF | AAC |
|---|---|---|
| Compression | Uncompressed PCM | Lossy (efficient) |
| File Size (3 min) | ~30–60 MB | ~3–6 MB |
| Apple Device Support | Native | Native |
| Android Support | Not supported | Native |
| Streaming Platform Use | Impractical (large) | Dominant (Apple Music, Spotify) |
| Audio Quality | Perfect lossless | Excellent (transparent at 192+ kbps) |
| DRM Support | No | Yes (FairPlay) |
| Web Browser Support | Limited | Variable by browser |
When to Convert
Common scenarios where this conversion is useful
Encoding AIFF masters for streaming distribution
Streaming services require AAC or MP3. Convert your lossless AIFF studio masters to AAC for upload to DistroKid, TuneCore, Apple Music for Artists, and other distribution platforms.
Reducing storage for portable devices
AIFF files are too large for portable devices. Convert AIFF recordings to AAC to store music on iPhone, iPod, and portable Bluetooth speakers without sacrificing perceptible audio quality.
Cross-platform audio sharing
AIFF has limited support outside macOS. AAC is natively supported on iPhone, Android, Windows, and all modern platforms. Convert AIFF to AAC for sharing audio across diverse device ecosystems.
Podcast and online content production
Convert AIFF podcast masters to AAC for distribution on Spotify, Apple Podcasts, and other platforms that use AAC for efficient audio streaming.
Who Uses This Conversion
Tailored guidance for different workflows
Musicians & Producers
- Convert AIFF recordings to AAC for distributing tracks to streaming platforms or collaborators
- Transform AIFF stems to AAC for sharing with other producers or mixing engineers
Podcasters
- Convert AIFF episode recordings to AAC for publishing on Apple Podcasts, Spotify, or RSS feeds
- Transform AIFF interview recordings to AAC for editing in Audacity or Adobe Audition
Content Creators
- Convert AIFF audio from video shoots to AAC for use as background music or voiceovers
- Extract and convert AIFF audio to AAC for repurposing content across multiple platforms
How to Convert AIFF to AAC
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1
Upload your AIFF file
Click the upload area or drag and drop your AIFF file. Files up to 25MB (free tier; 500MB on Pro) are accepted. Your file is transferred over an encrypted HTTPS connection.
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2
Convert to AAC
Click Convert. FFmpeg encodes the lossless AIFF PCM audio as AAC using a high-quality AAC encoder. Converting from AIFF ensures the best possible AAC output quality.
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3
Download your AAC file
Download the resulting AAC file, which will be dramatically smaller than the source AIFF. The file is auto-deleted from our servers after download.
Frequently Asked Questions
Yes. AAC is a lossy codec, so converting from lossless AIFF introduces irreversible quality reduction. At 256 kbps, AAC quality is near-transparent and indistinguishable from the lossless source in most listening tests. Keep the original AIFF as your master.
Converting from a lossless AIFF source gives AAC the best possible input quality. Re-encoding from MP3 to AAC compounds generation loss from two lossy encodings. AIFF → AAC is always preferred over MP3 → AAC.
Typically 5-10x smaller. A 50 MB AIFF file typically becomes 4-8 MB as AAC at 256 kbps, making it practical for mobile storage and streaming.
Yes. Android natively supports AAC audio. All modern Android devices and automotive head units handle AAC files without additional codecs.
AAC is generally considered better quality than MP3 at equivalent bitrates. AAC also offers better streaming support for Apple devices and platforms. For maximum compatibility (including legacy devices), MP3 has broader reach.
Yes, mostly. FFmpeg transfers AIFF metadata (title, artist, album) to AAC metadata tags. AIFF-specific markers and loop points are not preserved in AAC output.
Yes. Apple Music for Artists accepts AAC audio files for distribution. Ensure your AAC meets Apple's technical requirements (typically 256 kbps, 44100 Hz) for their mastering pipeline.
Yes. Files are uploaded over HTTPS, processed by FFmpeg on secure servers, and automatically deleted after download. We do not store or analyze your audio files.
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Need to convert programmatically?
Use the ChangeThisFile API to convert AIFF to AAC in your app. No rate limits, up to 500MB files, simple REST endpoint.
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