CONVERT AIFF → OPUS (AIFF to OPUS)
Fast, secure AIFF to OPUS conversion. No registration required.
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HOW TO CONVERT AIFF → OPUS
Upload the AIFF
Drop or select your AIFF file. The upload is encrypted and the file is queued for conversion.
Transcode via FFmpeg
FFmpeg decodes the AIFF stream to PCM internally, then re-encodes as OPUS at the bitrate you select.
Download the OPUS
The OPUS is delivered as a direct download; metadata and cover art transfer automatically where possible.
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 OPUS copy. Converting AIFF to OPUS changes the audio container without re-recording anything. Whether you are moving from a studio master to a distribution format or just making a file playable on an old car stereo, KaijuConverter re-encodes the audio with FFmpeg at your chosen bitrate and preserves sample rate, channels and ID3 tags. The source AIFF file stays untouched. In practice AIFF is Apple's uncompressed Audio Interchange File Format, the macOS equivalent of WAV. On the other end, Opus is the modern low-latency royalty-free codec used in VoIP, streaming, and WebRTC.
Why convert AIFF to OPUS
AIFF Audio is great in its own niche, but Opus Audio is either more universally playable or better suited to the device you are targeting. Converting lets you ship the audio without asking listeners to install a codec. The loss in quality between the two is negligible at sensible bitrates.
AIFF vs OPUS — 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
OPUS
- Extensions
- .opus, .ogg (container)
- MIME Type
- audio/opus
- Extension
- .opus
- Category
- Audio Files
- Full Name
- Opus Audio
- Conversion Engine
- FFMPEG
- MIME type
- audio/opus
- Standard
- RFC 6716 (2012)
- Sample rates
- 8, 12, 16, 24, 48 kHz
- Latency
- 5-60 ms (configurable)
| Specification | AIFF | OPUS |
|---|---|---|
| MIME types | audio/aiff, audio/x-aiff | — |
| Extensions | .aif, .aiff, .aifc | .opus, .ogg (container) |
| 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/opus |
| Extension | .aiff | .opus |
| Category | Audio Files | Audio Files |
| Full Name | AIFF Audio | Opus Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| MIME type | — | audio/opus |
| Standard | — | RFC 6716 (2012) |
| Sample rates | — | 8, 12, 16, 24, 48 kHz |
| Latency | — | 5-60 ms (configurable) |
AIFF vs OPUS — 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.
OPUS Strengths
- Best-in-class quality across the entire bitrate range.
- Royalty-free and patent-free.
- Ultra-low latency — suitable for live voice and music.
- Handles speech and music equally well — no need to switch codecs.
- Mandatory codec in WebRTC, so supported in every browser by design.
Limitations
- Very low hardware decoder adoption — software-only on most phones.
- Older platforms (legacy Windows apps, old cars) may not play .opus files.
- Container semantics confusing — Opus lives inside Ogg, WebM, or MP4.
Quality & Compatibility
Lossy-to-lossy transcoding (most cross-format audio jobs) loses a tiny amount of quality on each pass — usually inaudible at our default VBR ~190 kbps for music or 96 kbps for speech. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy is only as good as the target bitrate you choose.
Tips for Best Results
- Pick 128 kbps for podcasts and voice, 192–256 kbps for music, 320 kbps only if the audio will be edited further downstream.
- Keep the AIFF master alongside the OPUS — re-encoding a lossy format twice accumulates audible artefacts.
- For mono voice content, convert to mono OPUS explicitly to halve file size without any quality loss.
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 OPUS 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 OPUS container automatically where both formats support them. If a tag field has no OPUS 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.
Opus Audio
Target formatOpus is a versatile, open-source audio codec optimized for both speech and music at very low bitrates. It is the standard for WebRTC voice calls and excels at real-time communication.
Going the other way? Convert OPUS back to AIFF with the same engine.
Common Use Cases
Share across platforms
Send OPUS files to anyone without worrying about whether they have the right software for AIFF.
Embed in documents
Drop OPUS output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPUS 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 OPUS — 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
- Voice call (24 kbps) 180 KB/min
- Podcast (48 kbps) 21 MB/hour
- Music (128 kbps) ~1 MB/min
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
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