CONVERT AIFF → AAC (AIFF to AAC)
Fast, secure AIFF to AAC conversion. No registration required.
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HOW TO CONVERT AIFF → AAC
Provide the audio file
Drag the AIFF onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
ffmpeg handles the conversion
Our ffmpeg-based pipeline reads sample rate and channel layout, then writes a matching AAC with ID3 tags intact.
Save the output
Click to download the AAC. Batch uploads are bundled into a ZIP for single-click retrieval.
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 AAC copy. A AIFF to AAC conversion is typically about compatibility: some players refuse AIFF, many accept AAC. The audio payload makes the round trip with minimal artefacts when bitrate is left at sensible defaults. Drop a AIFF file into the uploader and the AAC comes back in seconds. A quick refresher — AIFF is Apple's uncompressed Audio Interchange File Format, the macOS equivalent of WAV. By contrast, AAC is the Advanced Audio Codec, more efficient than MP3 and ubiquitous in modern streaming.
Why convert AIFF to AAC
Moving from AIFF to AAC usually buys compatibility or a friendlier file size. For spoken-word content the difference is inaudible; for high-resolution music pick the highest bitrate the AAC codec supports to avoid compounding compression.
AIFF vs AAC — 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)
- MIME Type
- audio/aiff
- Extension
- .aiff
- Category
- Audio Files
- Full Name
- AIFF Audio
- Conversion Engine
- FFMPEG
AAC
- Extensions
- .aac, .m4a, .mp4 (container-dependent)
- MIME Type
- audio/aac
- Extension
- .aac
- Category
- Audio Files
- Full Name
- AAC Audio
- Conversion Engine
- FFMPEG
- MIME type
- audio/aac
- Standard
- ISO/IEC 14496-3
- Variants
- AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC
- Sample rates
- 8-96 kHz
| Specification | AIFF | AAC |
|---|---|---|
| MIME types | audio/aiff, audio/x-aiff | — |
| Extensions | .aif, .aiff, .aifc | .aac, .m4a, .mp4 (container-dependent) |
| Byte order | Big-endian | — |
| Max bit depth | 32 bits (PCM or float) | — |
| Max sample rate | 192 kHz (practical); unlimited (spec) | — |
| MIME Type | audio/aiff | audio/aac |
| Extension | .aiff | .aac |
| Category | Audio Files | Audio Files |
| Full Name | AIFF Audio | AAC Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| MIME type | — | audio/aac |
| Standard | — | ISO/IEC 14496-3 |
| Variants | — | AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC |
| Sample rates | — | 8-96 kHz |
AIFF vs AAC — 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.
AAC Strengths
- Better quality than MP3 at equal bitrate — the industry standard since 2000s.
- Universally supported on every smartphone, OS, and browser.
- Efficient on battery thanks to widespread hardware decoding.
- Scales from 8 kbps speech (HE-AACv2) to lossy-transparent 320 kbps.
- Five-channel + LFE surround support out of the box.
Limitations
- Patent-encumbered — encoders have licensing fees, which is why open alternatives (Opus, Vorbis) exist.
- Slightly more complex to encode than MP3.
- Raw .aac streams carry no seek index — tooling often prefers M4A/MP4 containers.
Quality & Compatibility
Sample rate, channel layout and bit depth are preserved by default: a 44.1 kHz stereo AIFF becomes a 44.1 kHz stereo AAC. Metadata — title, artist, album, cover art — travels where both formats support it. Protected DRM content cannot be converted legally and is rejected.
Tips for Best Results
- Check the podcast host specification before choosing bitrate — some mandate CBR 64 kbps, others accept VBR up to 192 kbps.
- Preserve ID3 tags by editing them before conversion; Mp3tag and MusicBrainz Picard handle round-tripping cleanly.
- If the AIFF is 24-bit studio audio, the AAC at 16-bit is sufficient for listening; higher is wasted on consumer playback gear.
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 AAC 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 AAC container automatically where both formats support them. If a tag field has no AAC equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
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.
AAC Audio
Target formatAAC is a lossy audio codec that delivers better sound quality than MP3 at similar bitrates. It is the default audio format for Apple Music, YouTube, and most streaming services.
Going the other way? Convert AAC back to AIFF with the same engine.
Common Use Cases
Share across platforms
Send AAC files to anyone without worrying about whether they have the right software for AIFF.
Embed in documents
Drop AAC output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AAC 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 AAC — Typical file sizes
Approximate file sizes for common scenarios.
- 3-min song (CD quality) 30 MB
- 3-min song (24-bit / 96 kHz) 100 MB
- Full album (CD, 10 tracks) 450 MB
- Speech podcast (64 kbps) 1 MB/min
- 3-min music track (128 kbps) 3 MB
- 3-min music track (256 kbps) 6 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
AAC Audio Format: The Complete Technical Guide
Complete technical guide to AAC: AAC-LC, HE-AAC v1/v2, AAC-ELD profiles, MDCT filter bank, TNS, PNS, joint stereo, bitrate reference, M4A vs ADTS containers...
Read guide →AAC Format: Complete Guide to Advanced Audio Coding (MPEG-4 Audio)
Complete guide to AAC audio format: AAC-LC vs HE-AAC profiles, M4A containers, Apple AAC vs FDK AAC encoders, quality comparison with MP3, and streaming...
Read guide →AIFF Format: The Complete Guide to Audio Interchange File Format
Everything about AIFF: IFF chunk structure, PCM audio data, AIFF vs AIFF-C vs WAV vs FLAC, Apple ecosystem use, sample rates, bit depth, and how to convert...
Read guide →
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