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QCP to ADPCM - Online Audio Converter
Convert QCP to ADPCM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert QCP to ADPCM
Drop QCP audio here or click to select
QCP
ADPCM (ADPCM)
About QCP to ADPCM
Convert QCP to ADPCM. QCP wraps QCELP voice memos from CDMA handsets. ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting..
Why convert QCP to ADPCM?
- Smaller files with ADPCM lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
QCP vs ADPCM
| Codec | QCP | ADPCM |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | QCP wraps QCELP voice memos from CDMA handsets. | ADPCM predicts samples to quarter voice-band bitrates. |
When not to convert QCP to ADPCM
- Skip ADPCM for archival masters: lossy compression discards detail, so keep the QCP original.
- Keep a master copy: repeated exports stack small losses, so archive QCP before batch ADPCM shares.
Limits
Starting point: QCP - QCP wraps QCELP voice memos from CDMA handsets. Same payload as QCELP under the handset file name. Variants differ by vendor, so confirm the flavor before converting. Encode ADPCM (ADPCM) from QCP 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 QCP to ADPCM?
Drop your QCP 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.