M4A to AMR Converter

How to Convert M4A to AMR Online

1. Upload Your M4A Files: Click "+ Add Files" to select M4A (Apple AAC) files from your computer, Google Drive, or Dropbox.
2. Choose Settings: Select audio codec, compression method (quality preset, target file size, or bitrate), sample rate, and channel configuration (stereo/mono). Optionally trim with start time and duration.
3. Convert and Download: Click "Convert" and download your AMR files.

Why Convert M4A to AMR?

AMR (Adaptive Multi-Rate) is the standard audio format for mobile voice communication:

Mobile Telephony Systems

AMR is the native codec for GSM and 3G voice calls. Some telephony systems and IVR (Interactive Voice Response) platforms require AMR input.

Minimal File Size

AMR at 12.2 kbps produces ~100KB per minute — 10x smaller than MP3 at 128kbps. Useful for bandwidth-constrained mobile applications.

Competitors like audioconverter.co notes "AMR exists as AMR-NB (Narrowband) and AMR-WB (Wideband)." onlineconverter.com offers dedicated "mobile audio converter" producing MP3 and AMR. ummyconverter.com provides "bitrate 12-64Kbps" selection for AMR output.

Important: Quality Reduction

AMR is designed for voice only at very low bitrates. Converting music or high-quality audio to AMR will result in significant quality loss — AMR is narrowband (300-3400 Hz) and discards most frequencies outside the speech range.

Frequently Asked Questions

Is it free?

Yes. Completely free with no sign-up required and no file count limits.

Will music sound good in AMR?

No. AMR is designed for speech only. Music will sound heavily compressed and distorted. Use MP3 or AAC for music.

Can I convert multiple files at once?

Yes. Upload multiple M4A files and convert them all with the same settings.

Does it work on mobile?

Yes. Works in any modern browser on all devices — no app installation required.