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