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AMR to M4A - Online Audio Converter
Convert AMR to M4A online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AMR to M4A
Drop AMR audio here or click to select
AMR
M4A (AAC)
About AMR to M4A
Convert AMR to M4A. AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. M4A is the MPEG-4 audio container usually holding AAC or ALAC. Check whether the track is AAC or ALAC before picking settings..
Why convert AMR to M4A?
- Smaller files with M4A lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AMR vs M4A
| Codec | AMR-NB | AAC |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. | M4A is the MPEG-4 audio container usually holding AAC or ALAC. |
When not to convert AMR to M4A
- Skip M4A for archival masters: lossy compression discards detail, so keep the AMR original.
- Keep a master copy: repeated exports stack small losses, so archive AMR before batch M4A shares.
Limits
Starting point: AMR - AMR encodes narrowband speech for GSM calls at 12.2 kbps and below. Tuned for voice calls, so music loses detail by design. Check whether the track is AAC or ALAC before picking settings. Encode M4A (AAC) from AMR 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 AMR to M4A?
Drop your AMR file onto this page, choose quality and codec settings, then click Convert. The result downloads as M4A instantly. All processing runs in your browser.
What codec is used for M4A?
The default codec for M4A is AAC. 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.