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ADPCM to ALAC (M4A) - Online Audio Converter
Convert ADPCM to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert ADPCM to ALAC (M4A)
Drop ADPCM audio here or click to select
ADPCM, WAV
ALAC (M4A) (ALAC)
About ADPCM to ALAC (M4A)
Convert ADPCM to ALAC (M4A). ADPCM predicts samples to quarter voice-band bitrates. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert ADPCM to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
ADPCM vs ALAC (M4A)
| Codec | ADPCM | ALAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | ADPCM predicts samples to quarter voice-band bitrates. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert ADPCM to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending ADPCM files.
- Keep a master copy: repeated exports stack small losses, so archive ADPCM before batch ALAC (M4A) shares.
Limits
Starting point: ADPCM - ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) 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.
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FAQ
How do I convert ADPCM to ALAC (M4A)?
Drop your ADPCM file onto this page, choose quality and codec settings, then click Convert. The result downloads as ALAC (M4A) instantly. All processing runs in your browser.
What codec is used for ALAC (M4A)?
The default codec for ALAC (M4A) is ALAC. 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.