Convert Audio Interchange File Format (.aiff) to Free Lossless Audio Codec (.flac) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .aiff 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 .flac file when it's ready.
AIFF and FLAC both deliver perfect audio quality, but they approach storage differently. AIFF stores raw PCM samples without any compression — pure, immediate, and large. FLAC (Free Lossless Audio Codec) compresses those same samples mathematically to 50-70% of the original size while guaranteeing bit-perfect reconstruction. Converting AIFF to FLAC is the definitive archival optimization: you keep every sample but cut storage in half.
FLAC is the universal lossless standard outside Apple's ecosystem. Linux, Android, Windows (via Windows 10+), Plex, Jellyfin, Kodi, Roon, and every audiophile music player support FLAC natively. FLAC also provides superior metadata support through Vorbis comments (arbitrary key-value tags), embedded cue sheets for album indexing, and SeekTable for instant seeking. For cross-platform lossless audio, FLAC is the consensus choice.
FFmpeg reads the AIFF PCM stream and encodes using the FLAC encoder at a configurable compression level (0-12). The default level 5 offers the best speed-to-size ratio. Higher levels squeeze out a few more percent of savings at significantly longer encode times, but all levels produce bit-identical decoded audio. FLAC preserves the exact sample rate, bit depth, and channel count of the AIFF source. Vorbis comment metadata tags are populated from AIFF ID3 tags.
Mathematically identical to AIFF. FLAC is a lossless codec — decoding produces the exact same PCM bitstream as the original AIFF, verifiable by binary comparison. This is not perceptual equivalence; it is mathematical identity.
| Device | AIFF | FLAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| 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
AIFF to FLAC is the most commonly recommended lossless conversion for cross-platform archival. You lose nothing and gain 40-60% storage savings plus broader device compatibility.
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| No |
| Funktion | AIFF | FLAC |
|---|---|---|
| Fulde navn | Audio Interchange File Format | Free Lossless Audio Codec |
| Filendelse | .aiff | .flac |
| Bedst til | Lossless quality | Lossless compression |