Opus to HE-AAC - Online Audio Converter
Convert Opus to HE-AAC online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About Opus to HE-AAC
Convert Opus to HE-AAC. Opus adapts from 6 kbps speech to 510 kbps music with low latency. HE-AAC adds spectral band replication for efficient low-bitrate streaming. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth..
Why convert Opus to HE-AAC?
- Smaller files with HE-AAC lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
Opus vs HE-AAC
| Codec | Opus | AAC (HE) |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | Opus adapts from 6 kbps speech to 510 kbps music with low latency. | HE-AAC adds spectral band replication for efficient low-bitrate streaming. |
When not to convert Opus to HE-AAC
- Skip HE-AAC for archival masters: lossy compression discards detail, so keep the Opus original.
- Keep a master copy: repeated exports stack small losses, so archive Opus before batch HE-AAC shares.
Limits
Starting point: Opus - 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. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth. Encode HE-AAC (AAC (HE)) from Opus 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.