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