AMR to HE-AAC - Online Audio Converter
Convert AMR to HE-AAC online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About AMR to HE-AAC
Convert AMR to HE-AAC. AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. 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 AMR to HE-AAC?
- Smaller files with HE-AAC lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AMR vs HE-AAC
| Codec | AMR-NB | AAC (HE) |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. | HE-AAC adds spectral band replication for efficient low-bitrate streaming. |
When not to convert AMR to HE-AAC
- Skip HE-AAC for archival masters: lossy compression discards detail, so keep the AMR original.
- Keep a master copy: repeated exports stack small losses, so archive AMR before batch HE-AAC shares.
Limits
Starting point: AMR - AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. Tuned for voice calls, so music loses detail by design. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth. Encode HE-AAC (AAC (HE)) from AMR 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.