Convert Free Lossless Audio Codec (.flac) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registration.
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Upload your .flac 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 .aiff file when it's ready.
AIFF (Audio Interchange File Format) is Apple's uncompressed audio standard, created in 1988 based on Electronic Arts' IFF structure. Converting FLAC to AIFF produces a bit-identical PCM representation of the original audio, just wrapped in a different container. Both formats are lossless, so this conversion involves zero quality loss — it simply repackages the audio data for environments that require AIFF, particularly professional Mac-based audio workflows using Logic Pro, GarageBand, or Pro Tools.
Many professional DAWs on macOS default to AIFF as their working format. Logic Pro, GarageBand, and Final Cut Pro all treat AIFF as a first-class citizen. While FLAC is more space-efficient due to lossless compression (typically 50-60% of WAV size), AIFF stores uncompressed PCM data that can be read sequentially without decoding overhead — an advantage in low-latency recording and live performance scenarios. Some CD mastering workflows also require AIFF input.
FFmpeg decodes the FLAC stream to PCM and writes it into an AIFF container. The PCM data in AIFF is stored big-endian (network byte order), unlike WAV which uses little-endian. AIFF supports up to 32-bit sample depth and sample rates exceeding 192 kHz. The conversion preserves the original bit depth and sample rate exactly. AIFF-C (compressed variant) exists but is rarely used; this conversion produces standard uncompressed AIFF.
There is zero quality difference between the source FLAC and the resulting AIFF. Both contain the exact same PCM samples — FLAC simply compresses them, while AIFF stores them raw. The resulting file will be roughly twice the size of the FLAC original (since FLAC achieves about 50-60% compression versus uncompressed PCM).
| Device | FLAC | AIFF |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
FLAC to AIFF is a straightforward lossless container swap. Use it when your Mac-based audio tools demand AIFF input, and keep the FLAC originals as space-efficient archives.
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| No |
| Funktion | FLAC | AIFF |
|---|---|---|
| Fulde navn | Free Lossless Audio Codec | Audio Interchange File Format |
| Filendelse | .flac | .aiff |
| Bedst til | Lossless compression | Lossless quality |