PCM to ADPCM - Online Audio Converter

Convert PCM to ADPCM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.

Convert PCM to ADPCM

[+] Drop PCM audio here or click to select PCM

Output format

ADPCM (ADPCM)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

About PCM to ADPCM

Convert PCM to ADPCM. PCM is raw pulse-code samples with no container or headers. ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting..

Why convert PCM to ADPCM?

Smaller files with ADPCM lossy compression.
Keep quality where supported.
Private, no upload - runs in your browser.

PCM vs ADPCM

Codec	PCM 16-bit	ADPCM
Compression	uncompressed	lossy
Sample behavior	Full quality kept	Quality set by bitrate
Typical use	PCM is raw pulse-code samples with no container or headers.	ADPCM predicts samples to quarter voice-band bitrates.

When not to convert PCM to ADPCM

Skip ADPCM for archival masters: lossy compression discards detail, so keep the PCM original.
Keep a master copy: repeated exports stack small losses, so archive PCM before batch ADPCM shares.

Limits

Starting point: PCM - PCM is raw pulse-code samples with no container or headers. Sample rate and width must be set by hand since headers carry none. Variants differ by vendor, so confirm the flavor before converting. Encode ADPCM (ADPCM) from PCM 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 PCM to ADPCM?

Drop your PCM 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.