Convert AIFF to Opus Free
Convert AIFF to Opus without paying a cent. No trial period. No account required. Just open the page and convert.
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AIFF (.aiff) · Max 20 MB
Most free converters add watermarks or throttle quality. AudioUtils does neither. You get the same output quality whether free or paid.
Free users get 5 conversions per month with a 10-second preview output. The conversion engine is identical to Pro — same speed, same quality, same privacy. Upgrade for full-length output.
Your files stay on your machine. Nothing is uploaded. AIFF is lossless. Converting to Opus reduces file size at the cost of some audio data. Use a high bitrate to minimize loss.
Frequently Asked Questions
What's special about Opus versus MP3 or AAC?
Opus dynamically switches between voice and music modes, achieves better quality than MP3 and AAC at low bitrates (32–96 kbps), supports the full audio band (up to 48 kHz sample rate), and has very low latency. It's why WhatsApp, Discord, and Zoom use it for voice. At higher bitrates (128+ kbps), Opus and AAC are roughly equivalent.
What Opus bitrate should I use?
128 kbps for music (transparent on almost any source). 96 kbps for everyday music with size constraints. 64 kbps for high-quality voice. 32 kbps for everyday voice/podcast. 24 kbps for extreme size constraints (still intelligible). Below 16 kbps starts to sound like a phone call.
Where does Opus play?
Native HTML5 audio in Chrome, Firefox, Safari, Edge. Discord, WhatsApp, Telegram (their voice messages are usually Opus). VLC, Foobar2000, MusicBee, modern Android. Native iOS Safari supports Opus in WebRTC and HTML5 audio (recent versions). Apple Music does NOT support Opus — use M4A/AAC for that.
Will AIFF metadata transfer to Opus?
Opus uses Vorbis comments for metadata (same as OGG and FLAC). Title, artist, album, year, and album art transfer if present in the AIFF. Track-level metadata works; AIFF's chunk-level metadata may not map directly.
Is Opus better for voice or music?
Both — that's the design goal. Opus beats MP3 and AAC at low bitrates for voice (32–64 kbps range). For music, Opus matches AAC quality at 128+ kbps. The encoder switches modes automatically based on content, so you don't need to specify.
How much smaller is Opus versus the AIFF source?
Roughly 50–100× smaller. A 100 MB AIFF (10 minutes stereo CD quality) becomes a 1–2 MB Opus at 128 kbps. The huge size reduction is why Opus dominates messaging and web audio.
About AIFF
Apple's uncompressed format. Similar to WAV but with better metadata support. Used in professional Mac audio workflows.
About Opus
Modern open-source codec. Best quality-per-bit of any lossy format. Used by Discord, WebRTC, and modern browsers.