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GSM to ALAC (M4A) - Online Audio Converter
Convert GSM to ALAC (M4A) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert GSM to ALAC (M4A)
Drop GSM audio here or click to select
GSM
ALAC (M4A) (ALAC)
About GSM to ALAC (M4A)
Convert GSM to ALAC (M4A). GSM 06.10 encodes European mobile speech at 13 kbps. ALAC is Apple's lossless codec stored inside M4A files. Stays bit-identical to WAV while tagging like AAC..
Why convert GSM to ALAC (M4A)?
- Larger files than lossy shares with ALAC (M4A) lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
GSM vs ALAC (M4A)
| Codec | GSM | ALAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | GSM 06.10 encodes European mobile speech at 13 kbps. | ALAC is Apple's lossless codec stored inside M4A files. |
When not to convert GSM to ALAC (M4A)
- Skip ALAC (M4A) for the smallest share: lossless output stays large, so prefer a lossy target when sending GSM files.
- Keep a master copy: repeated exports stack small losses, so archive GSM before batch ALAC (M4A) shares.
Limits
Starting point: GSM - GSM 06.10 encodes European mobile speech at 13 kbps. Carrier framing can offset timing; verify duration. Stays bit-identical to WAV while tagging like AAC. Encode ALAC (M4A) (ALAC) from GSM 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 GSM to ALAC (M4A)?
Drop your GSM 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.