AU to WMA — Format Comparison & Online Converter
Fast, instant AU to WMA conversion. No signup required. Just drop your .au file and get .wma in seconds.
Batch Settings
大切な音声ファイル、AU形式からWMA形式への変換でお困りではありませんか？せっかくの素晴らしい音源も、再生環境が限られていては宝の持ち腐れです。特にビジネスでのやり取りや、個人的なコレクションとして音質を保ちつつ汎用性を高めたい場合、適切なフォーマット選びは非常に重要になります。当サイトでは、お客様の貴重なAUファイルを、Windows環境で広く利用されているWMA形式へと、簡単かつ迅速に変換するお手伝いをいたします。音質の劣化を最小限に抑えつつ、様々なデバイスやソフトウェアでの互換性を向上させ、より多くの場面であなたのサウンドが輝くようサポートいたします。複雑な設定は不要。直感的な操作で、すぐに変換を始められます。
- ビジネス会議の議事録共有
- 同人音声作品の配布準備
- 古いCD音源のデジタルアーカイブ化
日本では、Windows OSの普及率が高く、それに伴いWMA形式のファイルがビジネス文書への埋め込みや一般的な音声共有で利用される場面が少なくありません。特に企業のイントラネット環境では、特定のコーデックに依存しないWMAが好まれる傾向にあります。
About AU to WMA Conversion
AU and WMA (introduced 1999) are both audio formats, but they differ in important ways. AU is a widely used file format. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections.
When you convert AU to WMA, the goal is to convert between formats quickly. Converting AU to WMA 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 WMA. 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 wma 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 WMA file. For the opposite direction, CocoConvert also supports WMA to AU conversion.
How to Convert AU to WMA
- 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 .wma
Set WMA as the output format. The converter uses optimal settings based on the AU→WMA conversion profile.
- 3
Convert
The server-side engine decodes your AU file and re-encodes it as WMA. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .wma file. Multiple output files can be downloaded together.
What Happens When You Convert AU to WMA
Your AU file is decoded and re-encoded as WMA.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in WMA format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
WMA
.wma file
| Extension | .wma |
| MIME Type | audio/x-ms-wma |
| Category | Audio |
Should You Convert AU to WMA?
When to Convert
- ✓When you need a WMA file
Frequently Asked Questions
What is the difference between AU and WMA?
AU is a widely used file format. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections.
Does AU to WMA conversion affect quality?
Converting AU to WMA maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, AU or WMA?
AU is a common audio format. WMA uses lossy compression. The better choice depends on whether you prioritize file size or quality.
How long does AU to WMA 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 WMA 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.