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AAC to Opus - Online Audio Converter
Convert AAC to Opus online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AAC to Opus
Drop AAC audio here or click to select
AAC
Opus (Opus)
About AAC to Opus
Convert AAC to Opus. AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. Opus adapts from 6 kbps speech to 510 kbps music with low latency. CD-era hardware may not decode it; use MP3 for legacy players..
Why convert AAC to Opus?
- Smaller files with Opus lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AAC vs Opus
| Codec | AAC | Opus |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. | Opus adapts from 6 kbps speech to 510 kbps music with low latency. |
When not to convert AAC to Opus
- Skip Opus for archival masters: lossy compression discards detail, so keep the AAC original.
- Keep a master copy: repeated exports stack small losses, so archive AAC before batch Opus shares.
Limits
Starting point: AAC - Efficient lossy audio for streaming services. Container variants (ADTS, MP4) need matching extensions on export. CD-era hardware may not decode it; use MP3 for legacy players. Encode Opus (Opus) from AAC at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert AAC to Opus?
Drop your AAC file onto this page, choose quality and codec settings, then click Convert. The result downloads as Opus instantly. All processing runs in your browser.
What codec is used for Opus?
The default codec for Opus is Opus. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.