AU to SD2 — Format Comparison & Online Converter
Fast, instant AU to SD2 conversion. No signup required. Just drop your .au file and get .sd2 in seconds.
Batch Settings
您是否曾遇到音频文件格式不兼容的困扰？特别是处理老旧的录音或专业音频项目时，AU（NeXT/Sun Microsystems音频格式）文件可能会让您束手无策，难以在现代设备或主流软件中播放和编辑。而SD2（Sound Designer II）格式，作为早期Macintosh平台上专业音频编辑的常用标准，虽然在特定圈子仍有其价值，但在跨平台共享和移动端应用方面也显得力不从心。将AU文件转换为SD2，能帮助您在特定专业音频工作流程中无缝衔接，或为一些经典音频软件提供兼容性支持。本工具旨在为您提供一个简便、高效的解决方案，让这些特定音频格式的转换变得轻而易举，助您轻松驾驭各种音频内容，不再受格式壁垒所限。
- 老旧游戏音频素材兼容
- 专业录音棚项目归档
- Mac OS经典软件适配
在中国大陆及周边地区，虽然AU和SD2并非主流消费级格式，但在一些广播电视、游戏开发早期项目以及专业音乐制作领域，仍可能遇到需要处理这些特定格式的场景，尤其是在兼容早期Macintosh平台的工作流时。
About AU to SD2 Conversion
AU and SD2 are both audio formats, but they differ in important ways. AU is a widely used file format. SD2 is a widely used file format.
When you convert AU to SD2, the goal is to convert between formats quickly. Converting AU to SD2 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 SD2. 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 sd2 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 SD2 file. For the opposite direction, CocoConvert also supports SD2 to AU conversion.
How to Convert AU to SD2
- 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 .sd2
Set SD2 as the output format. The converter uses optimal settings based on the AU→SD2 conversion profile.
- 3
Convert
The server-side engine decodes your AU file and re-encodes it as SD2. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .sd2 file. Multiple output files can be downloaded together.
What Happens When You Convert AU to SD2
Your AU file is decoded and re-encoded as SD2.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SD2 format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
SD2
.sd2 file
| Extension | .sd2 |
| MIME Type | audio/x-sd2 |
| Category | Audio |
Should You Convert AU to SD2?
When to Convert
- ✓When you need a SD2 file
Frequently Asked Questions
What is the difference between AU and SD2?
AU is a widely used file format. SD2 is a widely used file format.
Does AU to SD2 conversion affect quality?
Converting AU to SD2 maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, AU or SD2?
AU is a common audio format. SD2 is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does AU to SD2 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 SD2 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.