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AIFF → FLAC
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Fast, secure AIFF to FLAC conversion. No registration required.
AIFF is Apple's uncompressed Audio Interchange File Format, the macOS equivalent of WAV. That is why users land on this page looking for a FLAC copy. Moving audio from AIFF into FLAC is a routine job for podcasters, musicians, transcribers and anyone who needs a file to play somewhere the original would not. KaijuConverter reads the AIFF once, re-encodes through FFmpeg at the bitrate you choose, and returns a polished FLAC in seconds. Context: AIFF is Apple's uncompressed Audio Interchange File Format, the macOS equivalent of WAV. FLAC is the Free Lossless Audio Codec, offering 40–60% compression with zero quality loss.
AIFF Audio
Source formatAIFF is Apple's uncompressed audio format, equivalent to WAV in the macOS ecosystem. It stores CD-quality PCM audio and is widely used in professional audio production on Apple hardware.
FLAC Audio
Target formatFLAC is an open-source lossless audio codec that compresses audio to roughly 50-60% of its original size without any quality loss. It is the preferred format for audiophiles and music archival.
Why convert AIFF to FLAC
The motivation for a AIFF → FLAC conversion is almost always practical: a playback device, hosting platform or editing suite that insists on FLAC. The audio quality trade-off is controllable via bitrate; the compatibility win is immediate and unambiguous.
HOW TO CONVERT
AIFF → FLAC
Give us the AIFF
Select a AIFF (or several for batch). We read the header to pick decoder settings automatically.
Re-encode to FLAC
The audio is decoded, optionally resampled, and re-encoded as FLAC at transparent default bitrate.
Retrieve your FLAC
Grab the download as soon as it is ready. Typical jobs finish in seconds for short clips.
Common Use Cases
Share across platforms
Send FLAC files to anyone without worrying about whether they have the right software for AIFF.
Embed in documents
Drop FLAC output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
FLAC often produces smaller files than AIFF for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
AIFF vs FLAC — Strengths and limitations
What each format does best, and where it falls short.
AIFF Strengths
- Lossless and uncompressed — bit-exact audio reproduction.
- Native to macOS and all Apple Pro Audio apps.
- Simple structure — trivially parsed by audio libraries.
- Supports up to 32-bit float, 192 kHz, and multi-channel audio.
- Rich metadata via named chunks (annotations, markers, MIDI).
Limitations
- Enormous file sizes — 10 MB per minute at CD quality.
- No built-in compression — use FLAC for lossless with smaller files.
- Big-endian byte order confuses tools written on little-endian hardware.
FLAC Strengths
- Lossless — decoded audio is bit-exact identical to the source.
- 40-60% smaller than uncompressed WAV/AIFF.
- Free, patent-free, open-source reference implementation.
- Built-in error detection via MD5 checksums.
- Streaming-friendly — seek tables let you jump to any timestamp instantly.
Limitations
- File sizes still large compared to lossy codecs (5-10× bigger than AAC for same audio).
- Not suitable for low-bandwidth scenarios like streaming on mobile data.
- Older MP3 players and car stereos may not decode FLAC.
AIFF vs FLAC — Technical specifications
Side-by-side comparison of the technical details.
AIFF
- MIME types
- audio/aiff, audio/x-aiff
- Extensions
- .aif, .aiff, .aifc
- Byte order
- Big-endian
- Max bit depth
- 32 bits (PCM or float)
- Max sample rate
- 192 kHz (practical); unlimited (spec)
FLAC
- Max bit depth
- 32 bits per sample
- Max sample rate
- 655 350 Hz
- MIME type
- audio/flac
- Extension
- .flac
- Standard
- Open-source reference implementation (Xiph.Org)
- Max channels
- 8
| Specification | AIFF | FLAC |
|---|---|---|
| MIME types | audio/aiff, audio/x-aiff | — |
| Extensions | .aif, .aiff, .aifc | — |
| Byte order | Big-endian | — |
| Max bit depth | 32 bits (PCM or float) | 32 bits per sample |
| Max sample rate | 192 kHz (practical); unlimited (spec) | 655 350 Hz |
| MIME type | — | audio/flac |
| Extension | — | .flac |
| Standard | — | Open-source reference implementation (Xiph.Org) |
| Max channels | — | 8 |
AIFF vs FLAC — Typical file sizes
Approximate file sizes for common scenarios.
AIFF
- 3-min song (CD quality) 30 MB
- 3-min song (24-bit / 96 kHz) 100 MB
- Full album (CD, 10 tracks) 450 MB
FLAC
- 3-min song (CD quality) 20-30 MB
- Full album (10 tracks, CD) 250-400 MB
- 3-min song (hi-res 24-bit/96 kHz) 80-120 MB
- Live concert recording (24-bit) 2-10 GB
Quality & Compatibility
The FLAC output is as good as the AIFF source allows. If the AIFF was encoded at 96 kbps, the FLAC cannot reconstruct detail the encoder already dropped; picking a very high FLAC bitrate just produces a larger file. Match FLAC bitrate to the AIFF quality for the best balance.
Tips for Best Results
- Sample-rate mismatches between AIFF and target device (48 kHz phone output from a 44.1 kHz track) are handled automatically; no manual resampling needed.
- For audiobook delivery, match the platform spec exactly — ACX requires 192 kbps CBR 44.1 kHz stereo, for example.
- Batch-convert an album in one job so every track shares identical encoder settings and loudness normalisation.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for FLAC and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the AIFF container to the FLAC container automatically where both formats support them. If a tag field has no FLAC equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.