AMR to M4R Converter
Select files for conversion or just drag and drop them to the upload area
How to convert AMR files to M4R online?
Step 1.
Upload AMR-file
Click "Choose File" button to select a amr file on your computer. AMR file size can be up to 50 Mb.
Step 2.
Convert AMR to M4R
Click "Convert" button to start conversion.
Step 3.
Download your M4R
When the conversion process is complete, you can download the M4R file.
Information about AMR and M4R file formats
| Name | AMR | M4R |
| Full name | AMR - Adaptive Multi-Rate | M4R - MPEG 4 Ringtones Audio |
| File extension | .amr, .3ga | .m4r |
| MIME type | audio/amr | audio/aac |
| Developed by | 3GPP | Apple Inc. |
| Type of format | Audio compression format | |
| Description | The Adaptive Multi-Rate (AMR or AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1999 and is now widely used in GSM and UMTS. | M4R - is a digital multimedia container format used to store audio in mono channel mode. The Apple iPhone uses MPEG-4 audio files (with .m4r extension) for its ringtones. Length of m4r ringtone must be max 40 seconds. M4R and M4A formats shares many similar features. |
| Technical details | AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200-3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s. Sampling frequency 8 kHz/13-bit (160 samples for 20 ms frames), filtered to 200-3400 Hz. | |
| File conversion | AMR conversion | M4R conversion |
| Associated programs | Audacity, FFmpeg, MPlayer, QuickTime, VLC media player | Apple QuickTime Player, Apple iTunes |
| Wiki | https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec | http://en.wikipedia.org/wiki/MPEG-4_Part_14 |
AMR to M4R conversion quality rating:
4.7 (545 votes)
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