Convert AMR to M4A - online and free
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How to convert a AMR to a M4A file?
- Choose the AMR file that you want to convert.
- Select M4A as the the format you want to convert your AMR file to.
- Click "Convert" to convert your AMR file.
Zamzar Pro Tip: You can use the Quicktime player to open AMR files.
Step 1 - Select a file(s) to convert
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Step 2 - Convert your files to
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AMR (Audio)
| File extension | .amr |
| Category | Audio File |
| Description | The Adaptive Multi-Rate format was specifically designed for speech coding. Many phone providers use the AMR format to store short audio recordings but shouldn't really be used to store other audio such as music due to it's design. In 1999 AMR was adopted as the chosen speech standard for 3GPP. The AMR file is often converted into other formats to allow for use and ease of distribution. |
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| Technical Details | The AMR codec uses eight source codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s and has a sampling frequency of 8kHz which is filtered to 200-3400 Hz. The AMR algorithm utilises link adaptation in order to be utilised with radio channel and capacity requirements. |
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| Developed by | 3rd Generation Partnership Project (3GPP) |
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M4A (Audio)
| File extension | .m4a |
| Category | Audio File |
| Description | M4A audio files were developed to enable easy sharing of digital music, audiobook content, podcasts. It was generally intended as the successor to MP3 and the file quality is better and file sizes smaller compared to MP3 files. M4A files sound better than MP3 files when encoded at the same bit rate due to some of the enhancements. It's the default audio format for Apple products, Nintendo products, Android, Blackberry, PlayStation, and many in-dash music systems in cars. |
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| Technical Details | M4A is a file encoded with advanced audio coding (AAC) and is implemented with AAC compression standards or ALAC (Apple Lossless Audio Codec) specifications. This effectively means that they can be decoded back to their original quality they were at the point of compression. It was developed by Apple and it only contains audio data, rather than MP4 which contains both audio and video. An added benefit of M4A files are that they do not carry any Digital Rights Management protection. |
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| Developed by | Apple |
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Convert AMR file
Using Zamzar, it is possible to convert AMR files to a variety of other formats
- amr to aac (Advanced Audio Coding File)
- amr to ac3 (AC3 Audio File)
- amr to flac (Free Lossless Audio Codec)
- amr to m4a (Compressed video file)
- amr to mp3 (Compressed audio file)
- amr to mp4 (MPEG-4 Video File)
- amr to ogg (Ogg Vorbis Compressed Audio File)
- amr to wav (Windows audio file)
- amr to wma (Windows Media Audio)