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MP3 to ALAC (M4A) - Online Audio Converter
Convert MP3 to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert MP3 to ALAC (M4A)
Drop MP3 audio here or click to select
MP3
ALAC (M4A) (ALAC)
About MP3 to ALAC (M4A)
Convert MP3 to ALAC (M4A). MP3 is the MPEG-1 Layer III codec, playable on virtually every device. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert MP3 to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
MP3 vs ALAC (M4A)
| Codec | libmp3lame | ALAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | MP3 is the MPEG-1 Layer III codec, playable on virtually every device. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert MP3 to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending MP3 files.
- Keep a master copy: repeated exports stack small losses, so archive MP3 before batch ALAC (M4A) shares.
Limits
Starting point: MP3 - Lossy compressed music near 128-256 kbps. Repeated re-encoding stacks artifacts; convert from the master. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) from MP3 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 MP3 to ALAC (M4A)?
Drop your MP3 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.