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
音声ファイル形式の変換でお困りではありませんか？AUとSD2は、それぞれ異なる環境で利用されるオーディオフォーマットです。AUはSun Microsystemsによって開発され、特にUNIXベースのシステムや古いウェブブラウザで広く使われてきました。一方、SD2はDigidesign（現在のAVID）がプロフェッショナルなオーディオ編集ソフトウェアであるPro Tools向けに開発したもので、高音質なサウンドを扱う際に選ばれることが多いです。この二つの形式間での変換は、互換性の問題を解決し、お手持ちのオーディオ資産をより柔軟に活用するために不可欠となります。本ページでは、AUファイルをSD2形式へスムーズに変換する方法をご紹介し、お客様のデジタルオーディオライフをサポートいたします。
- プロの音楽制作現場でのデータ共有
- 古いアーカイブ音源の現代システムへの移行
- 海外とのオーディオコンテンツ共同開発
日本では、Pro Toolsが音楽スタジオや放送局で標準的に使用されているため、SD2形式への変換ニーズは特に高いです。しかし、SD2はWindows環境でのネイティブサポートが限られているため、変換ツール選びが重要になります。
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.