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