OPUS to AU — Format Comparison & Online Converter
Fast, instant OPUS to AU conversion. No signup required. Just drop your .opus file and get .au in seconds.
Batch Settings
在音频文件格式的世界里，OPUS以其高效的压缩率和出色的音质，在网络通话和流媒体中占据了一席之地。但当您需要将这些精巧的OPUS文件，转换成历史更悠久、兼容性更广，尤其是在某些专业音频编辑软件或老旧系统中表现更佳的AU格式时，可能会遇到一些小挑战。AU格式，作为Sun Microsystems早期在Unix系统上推广的音频标准，虽然在日常生活中不常见，但在特定场景下，比如一些游戏开发、旧版媒体播放器或特定嵌入式设备的开发中，依然有着它的独特作用。我们的在线转换工具，正是为了解决这一痛点而生，让您无需安装复杂软件，就能轻松实现OPUS到AU的无损转换，确保您的音频文件在新旧平台间顺畅流通，无论是工作还是娱乐，都能得心应手。
- 微信语音分享
- 手游背景音乐
- 老旧系统兼容
在大陆、台湾和新加坡，AU格式虽然不常用作主流分享，但在一些涉及老旧游戏音频资源提取或特定硬件开发时，仍可能需要用到，以确保最佳兼容性。
About OPUS to AU Conversion
OPUS (introduced 2012) and AU are both audio formats, but they differ in important ways. Opus is a versatile open codec excelling at both speech and music, used in WebRTC and Discord. AU is a widely used file format.
When you convert OPUS to AU, the goal is to convert between formats quickly. Converting OPUS to AU maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your OPUS file is decoded and re-encoded as AU. The conversion involves 4 steps: (1) your opus file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in au 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 AU file. For the opposite direction, CocoConvert also supports AU to OPUS conversion.
How to Convert OPUS to AU
- 1
Upload .opus file
Select your OPUS file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .au
Set AU as the output format. The converter uses optimal settings based on the OPUS→AU conversion profile.
- 3
Convert
The server-side engine decodes your OPUS file and re-encodes it as AU. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .au file. Multiple output files can be downloaded together.
What Happens When You Convert OPUS to AU
Your OPUS file is decoded and re-encoded as AU.
Your OPUS file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in AU format
The converted file is ready for download
Format Comparison
Opus
.opus file
| Extension | .opus |
| MIME Type | audio/opus |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert OPUS to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
What is the difference between OPUS and AU?
Opus is a versatile open codec excelling at both speech and music, used in WebRTC and Discord. AU is a widely used file format.
Does OPUS to AU conversion affect quality?
Converting OPUS to AU maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, OPUS or AU?
OPUS uses lossy compression. AU is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does OPUS to AU 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 OPUS or AU better for long-term storage?
Both formats use lossy compression, so consider keeping your original source file for long-term storage.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.