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GSM to HE-AAC - Online Audio Converter
Convert GSM to HE-AAC online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert GSM to HE-AAC
Drop GSM audio here or click to select
GSM
HE-AAC (AAC (HE))
About GSM to HE-AAC
Convert GSM to HE-AAC. GSM 06.10 encodes European mobile speech at 13 kbps. 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 GSM to HE-AAC?
- Smaller files with HE-AAC lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
GSM vs HE-AAC
| Codec | GSM | AAC (HE) |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | GSM 06.10 encodes European mobile speech at 13 kbps. | HE-AAC adds spectral band replication for efficient low-bitrate streaming. |
When not to convert GSM to HE-AAC
- Skip HE-AAC for archival masters: lossy compression discards detail, so keep the GSM original.
- Keep a master copy: repeated exports stack small losses, so archive GSM before batch HE-AAC shares.
Limits
Starting point: GSM - GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration. Needs an HE-AAC decoder; plain AAC players may play only half the bandwidth. Encode HE-AAC (AAC (HE)) from GSM 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 GSM to HE-AAC?
Drop your GSM file onto this page, choose quality and codec settings, then click Convert. The result downloads as HE-AAC instantly. All processing runs in your browser.
What codec is used for HE-AAC?
The default codec for HE-AAC is AAC (HE). 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.