All Tools
[ audio bench ]
AC3 to ALAC (M4A) - Online Audio Converter
Convert AC3 to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AC3 to ALAC (M4A)
Drop AC3 audio here or click to select
AC3
ALAC (M4A) (ALAC)
About AC3 to ALAC (M4A)
Convert AC3 to ALAC (M4A). AC3 (Dolby Digital) carries 5.1 surround on DVDs and broadcasts. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert AC3 to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AC3 vs ALAC (M4A)
| Codec | AC-3 | ALAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | AC3 (Dolby Digital) carries 5.1 surround on DVDs and broadcasts. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert AC3 to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending AC3 files.
- Keep a master copy: repeated exports stack small losses, so archive AC3 before batch ALAC (M4A) shares.
Limits
Starting point: AC3 - AC3 (Dolby Digital) carries 5.1 surround on DVDs and broadcasts. Downmix choices change loudness; check levels after conversion. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) from AC3 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.
Related conversions
FAQ
How do I convert AC3 to ALAC (M4A)?
Drop your AC3 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.