All Tools
[ audio bench ]
GSM to ADPCM - Online Audio Converter
Convert GSM to ADPCM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert GSM to ADPCM
Drop GSM audio here or click to select
GSM
ADPCM (ADPCM)
About GSM to ADPCM
Convert GSM to ADPCM. GSM 06.10 encodes European mobile speech at 13 kbps. ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting..
Why convert GSM to ADPCM?
- Smaller files with ADPCM lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
GSM vs ADPCM
| Codec | GSM | ADPCM |
|---|---|---|
| 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. | ADPCM predicts samples to quarter voice-band bitrates. |
When not to convert GSM to ADPCM
- Skip ADPCM 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 ADPCM shares.
Limits
Starting point: GSM - GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration. Variants differ by vendor, so confirm the flavor before converting. Encode ADPCM (ADPCM) 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.
Related conversions
FAQ
How do I convert GSM to ADPCM?
Drop your GSM file onto this page, choose quality and codec settings, then click Convert. The result downloads as ADPCM instantly. All processing runs in your browser.
What codec is used for ADPCM?
The default codec for ADPCM is ADPCM. 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.