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AAC to ALAC (M4A) - Online Audio Converter
Convert AAC to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AAC to ALAC (M4A)
Drop AAC audio here or click to select
AAC
ALAC (M4A) (ALAC)
About AAC to ALAC (M4A)
Convert AAC to ALAC (M4A). AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert AAC to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AAC vs ALAC (M4A)
| Codec | AAC | ALAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert AAC to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending AAC files.
- Keep a master copy: repeated exports stack small losses, so archive AAC before batch ALAC (M4A) shares.
Limits
Starting point: AAC - Efficient lossy audio for streaming services. Container variants (ADTS, MP4) need matching extensions on export. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) from AAC 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 AAC to ALAC (M4A)?
Drop your AAC 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.