Convert Audio Interchange File Format (.aiff) to Apple Lossless Audio Codec (.alac) 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 .m4a file when it's ready.
Both AIFF and ALAC are Apple formats that store audio at full quality, but they take fundamentally different approaches. AIFF stores raw uncompressed PCM — every sample is written directly, consuming about 10 MB per minute. ALAC (Apple Lossless Audio Codec) compresses the same data losslessly, achieving 50-60% size reduction while guaranteeing bit-for-bit perfect reproduction when decoded. Converting AIFF to ALAC halves your storage without sacrificing a single sample.
AIFF files are wastefully large for storage and library management. A 500-song AIFF library takes roughly 30 GB, while the same library in ALAC fits in about 15 GB with absolutely zero quality difference. ALAC plays natively on every Apple device — iPhone, iPad, Mac, HomePod, Apple TV, AirPods Max — and is the format Apple Music uses for lossless streaming. There is no reason to keep files as AIFF unless you need zero-decode-overhead for real-time DAW playback.
FFmpeg reads the AIFF PCM data and encodes it using the ALAC encoder into an M4A container. ALAC uses adaptive linear prediction and Rice coding to compress PCM samples losslessly. The compression ratio varies by content — simple audio (silence, sine waves) compresses better than complex audio (dense orchestral music). Typical ratios: 40-60% of the AIFF size. All sample rates and bit depths (16, 24, 32-bit) are preserved exactly.
Absolutely identical. ALAC is a lossless codec — when decoded, it produces the exact same PCM data as the original AIFF file, bit for bit, sample for sample. You can verify this by decoding both and computing a binary diff. This is not 'virtually lossless' or 'perceptually lossless' — it is mathematically identical.
| Device | AIFF | ALAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | 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
AIFF to ALAC is a pure optimization: identical quality at half the storage. If you are in the Apple ecosystem, there is no downside to this conversion. Keep an AIFF master only if you need real-time DAW performance.
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| No |
| Egenskap | AIFF | ALAC |
|---|---|---|
| Fullt navn | Audio Interchange File Format | Apple Lossless Audio Codec |
| Filendelse | .aiff | .m4a |
| Best egnet for | Lossless quality | Lossless |