AU to AMR — Format Comparison & Online Converter
Fast, instant AU to AMR conversion. No signup required. Just drop your .au file and get .amr in seconds.
Batch Settings
您是否遇到过这样的情况：手头有些AU格式的音频文件，想在手机上播放，或者通过微信分享给朋友，却发现打不开？AU作为一种历史悠久的音频格式，在某些专业领域依然常见，但如今移动设备和网络通讯更偏爱高效、兼容性广的格式。AMR，尤其是AMR-NB，正是移动设备上非常普及的语音编码格式，它以小巧的体积和良好的通话音质而闻名。将AU文件转换为AMR，能让您的音频内容轻松适配各类手机应用和低带宽网络环境，实现流畅播放与便捷分享。我们的转换工具旨在帮助您快速、无损地完成这一过程，让您的宝贵音频资料焕发新生，无论是在日常沟通还是特定应用场景中，都能畅通无阻。
- 微信语音分享
- 手机游戏音效
- 旧录音转存
在大陆和新加坡，AMR-NB格式因其对移动网络带宽的友好性，常被用于早期的语音通话记录和部分即时通讯软件的语音消息。台湾地区虽然也支持AMR，但更倾向于AAC等音质更好的格式用于多媒体分享。
About AU to AMR Conversion
AU and AMR (introduced 1999) are both audio formats, but they differ in important ways. AU is a widely used file format. AMR is a speech-optimised audio codec used in mobile voice recordings.
When you convert AU to AMR, the goal is to convert between formats quickly. Converting AU to AMR maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your AU file is decoded and re-encoded as AMR. The conversion involves 4 steps: (1) your au file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in amr format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a AMR file. For the opposite direction, CocoConvert also supports AMR to AU conversion.
How to Convert AU to AMR
- 1
Upload .au file
Select your AU file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .amr
Set AMR as the output format. The converter uses optimal settings based on the AU→AMR conversion profile.
- 3
Convert
The server-side engine decodes your AU file and re-encodes it as AMR. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .amr file. Multiple output files can be downloaded together.
What Happens When You Convert AU to AMR
Your AU file is decoded and re-encoded as AMR.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in AMR format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
AMR
.amr file
| Extension | .amr |
| MIME Type | audio/amr |
| Category | Audio |
Should You Convert AU to AMR?
When to Convert
- ✓When you need a AMR file
Frequently Asked Questions
What is the difference between AU and AMR?
AU is a widely used file format. AMR is a speech-optimised audio codec used in mobile voice recordings.
Does AU to AMR conversion affect quality?
Converting AU to AMR maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, AU or AMR?
AU is a common audio format. AMR uses lossy compression. The better choice depends on whether you prioritize file size or quality.
How long does AU to AMR conversion take?
Most conversions finish in seconds. Larger files or complex audio content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is AU or AMR better for long-term storage?
Both formats use lossy compression, so consider keeping your original source file for long-term storage.
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