AU Won't Open? Convert to SOX Instantly
Fast, instant AU to SOX conversion. No signup required. Just drop your .au file and get .sox in seconds.
Batch Settings
您手头是不是有那些后缀为".au"的音频文件，正琢磨着怎么把它们转换成更通用、更灵活的SOX格式？别担心，这在音频处理中是常有的事。AU格式，虽然在某些特定系统或旧应用中仍有身影，但如果想在各种设备上无缝播放、进行后期编辑，或者与现代软件更好地兼容，SOX格式无疑是更优选。我们的在线转换工具，正是为此而生。它操作简便，无需安装任何软件，只需轻轻几点，就能帮您把AU文件转换为高效的SOX格式，让您的音频内容焕发新生，轻松适应各种使用场景。
- 游戏音效适配
- 移动端音频分享
- 旧系统录音转档
在中国大陆及周边地区，SOX格式因其开源特性和强大的命令行处理能力，常被开发者和音频工程师用于批量处理和自动化工作流，尤其在游戏和语音识别领域有广泛应用。
About AU to SOX Conversion
Dealing with a AU file that won't open on your device? You're not alone — AU compatibility issues are one of the most common reasons people search for a file converter. AU is a widely used file format.
The fix is simple: convert your AU to SOX. SOX is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting AU to SOX maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert processes your AU file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you When you need a SOX file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert AU to SOX
- 1
Add your AU file
Drag and drop your .au file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick SOX output
Select .sox as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The audio engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .sox file. For batch jobs, download all at once as a zip.
What Happens When You Convert AU to SOX
Your AU file is decoded and re-encoded as SOX.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SOX format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
SOX
.sox file
| Extension | .sox |
| MIME Type | audio/x-sox |
| Category | Audio |
Should You Convert AU to SOX?
When to Convert
- ✓When you need a SOX file
Frequently Asked Questions
Why won't my AU file open?
AU files may not open if your device lacks the right codec or application. Converting to SOX — a more widely supported format — usually resolves this. SOX is a widely used file format.
Is it safe to convert AU to SOX online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting AU to SOX?
Converting AU to SOX maintains high quality with CocoConvert's optimised encoder settings. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my AU file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert AU to SOX on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.