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PCM to ALAC (M4A) - Online Audio Converter
Convert PCM to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert PCM to ALAC (M4A)
Drop PCM audio here or click to select
PCM
ALAC (M4A) (ALAC)
About PCM to ALAC (M4A)
Convert PCM to ALAC (M4A). PCM is raw pulse-code samples with no container or headers. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert PCM to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
PCM vs ALAC (M4A)
| Codec | PCM 16-bit | ALAC |
|---|---|---|
| Compression | uncompressed | lossless |
| Sample behavior | Full quality kept | Full quality kept |
| Typical use | PCM is raw pulse-code samples with no container or headers. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert PCM to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending PCM files.
- Keep a master copy: repeated exports stack small losses, so archive PCM before batch ALAC (M4A) 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. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) 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 ALAC (M4A)?
Drop your PCM 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.