OGG to AU — Format Comparison & Online Converter
Fast, instant OGG to AU conversion. No signup required. Just drop your .ogg file and get .au in seconds.
Batch Settings
お気に入りの音声ファイルを、より幅広い環境で利用したいとお考えですか？ OGG形式は高音質で知られていますが、時に再生環境を選ぶことがあります。そんな時、汎用性の高いAU形式への変換が役立ちます。特に、古くからのシステムや特定の業務用ソフトウェアでは、AU形式が標準として扱われる場面も少なくありません。この変換ツールを使えば、大切な音源の品質を保ちつつ、互換性の問題を解消し、様々なデバイスやアプリケーションでスムーズに再生できるようになります。複雑な設定は一切不要。数クリックで、あなたの音声を新たな形で活用する道が開かれます。さあ、今すぐ変換を始めて、より自由なオーディオ体験を手に入れましょう。
- レトロゲームのサウンド抽出
- ビジネスプレゼン用音声素材
- 伝統芸能のアーカイブ化
日本国内の古い業務用音響機器や、一部のDAW（デジタルオーディオワークステーション）では、AU形式がOggよりも安定して動作するケースが報告されています。特に官公庁や教育機関での利用において、その傾向が見られます。
About OGG to AU Conversion
OGG (introduced 2000) and AU are both audio formats, but they differ in important ways. OGG Vorbis is an open-source lossy audio format with excellent quality at low bitrates. AU is a widely used file format.
When you convert OGG to AU, the goal is to convert between formats quickly. Converting OGG 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 OGG file is decoded and re-encoded as AU. The conversion involves 4 steps: (1) your ogg 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 OGG conversion.
How to Convert OGG to AU
- 1
Upload .ogg file
Select your OGG 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 OGG→AU conversion profile.
- 3
Convert
The server-side engine decodes your OGG 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 OGG to AU
Your OGG file is decoded and re-encoded as AU.
Your OGG 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
OGG
.ogg file
| Extension | .ogg |
| MIME Type | audio/ogg |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert OGG to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
What is the difference between OGG and AU?
OGG Vorbis is an open-source lossy audio format with excellent quality at low bitrates. AU is a widely used file format.
Does OGG to AU conversion affect quality?
Converting OGG to AU maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, OGG or AU?
OGG uses lossy compression. AU is widely supported. The better choice depends on whether you prioritize file size or quality.
How long does OGG 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 OGG 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.