Convert AU to AMR
Fast, free AU to AMR conversion — works in any browser
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au
AU format for reliable data storage
| File extension | .au .snd |
|---|---|
| File category | audio |
| Programs | VLC media player Audacity MPlayer Xine Sox |
| Tech description | https://en.wikipedia.org/wiki/Au_file_format |
| MIME type | audio/basic audio/au |
| Developer | Sun Microsystems |
This audio format was developed by Sun Microsystems. It is intended for storing audio files; the file itself consists of three components: the header, the annotation unit, and the audio file itself. What distinguishes this format is the small file size, due to which its sound quality is low. It can be converted into other formats, such as mp3 or MPEG. Although this format is mostly used on personal computers that are powered by operating systems Sun or Unix, AU files can also be opened using other audio players.
amr
AMR (Adaptive Multi Rate): adaptive encoding with variable bitrate
| File extension | .amr |
|---|---|
| File category | audio |
| Programs | VLC media player Windows Media Player QuickTime Player Audacity |
| Tech description | https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec |
| MIME type | audio/amr |
| Developer | 3GPP |
This information compression format allows for optimizing speech encoding. Files in the Adaptive Multi Rate format can be created using phones and smartphones. AMR files are mostly used for voice recordings. The main advantages of the format are the large number of encoding and decoding rates, as well as the small size of the resulting content. With the help of appropriate software, an Adaptive Multi Rate file can be converted into any other audio format.
FAQ
How to convert AMR to AU?
Upload your AMR file, select AU as the output format, and click Convert. The converted file will be ready to download in seconds — no account or installation required.
How long does it take to convert AMR to AU?
Most AMR files convert in seconds. Larger files may take up to a few minutes depending on size and internet speed. You can track the progress bar in real time during conversion.
Is it safe to convert AMR files online?
Yes. All uploaded AMR files and converted AU results are automatically deleted from our servers within 1 hour after conversion. We do not store, share, or access your files.
Can I convert AMR on iPhone or Android?
Yes, our converter works on all devices and operating systems — iPhone, iPad, Android, Windows, and macOS. Open the site in your mobile browser, upload the AMR file and convert to AU without installing any app.
