AIF vs AU — Comparison & Free Converter
Fast, instant AIF to AU conversion. No signup required. Just drop your .aif file and get .au in seconds.
Batch Settings
大切な音声ファイル、AIF形式からAU形式への変換でお困りではありませんか？当社の変換ツールは、音質の劣化を最小限に抑えつつ、迅速かつ正確なファイル変換を可能にします。日本のお客様にとって、特にビジネスシーンでの音声データのやり取りや、ウェブサイト上での音声コンテンツ公開において、ファイル形式の互換性は非常に重要です。煩雑な設定は一切不要。直感的な操作で、どなたでも簡単にご利用いただけます。高品質なオーディオ体験を、より多くの環境で共有するために、ぜひ当社の変換サービスをご活用ください。あなたの貴重なサウンドを、最適な形で次へと繋ぎます。
- ウェブサイトの音声ガイド
- ビジネス会議の議事録
- アニメ・ゲームのSE素材
AU形式は、かつてSun Microsystemsが開発した音声フォーマットであり、特定のUNIX系システムや古いウェブブラウザでの互換性を保つために、現在でも一部の専門的な現場で利用されることがあります。特にレガシーシステムとの連携が必要な場合、この変換が役立つでしょう。
About AIF to AU Conversion
AIF or AU — which format should you use? The answer depends on your needs. Here's a quick breakdown.
AIF is a widely used file format. It has common platform support. AU is a widely used file format. It has common platform support.
So when should you convert AIF to AU? This conversion is ideal when you When you need a AU file. This conversion helps you convert between formats quickly.
Converting AIF to AU maintains high quality with CocoConvert's optimised encoder settings.
If you've decided AU is the right choice, CocoConvert makes the conversion effortless. Upload your .aif file, pick AU, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert AIF to AU
- 1
Choose your AIF file
Upload your .aif file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to AU
Select .au from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large audio files.
- 4
Get your AU file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert AIF to AU
Your AIF file is decoded and re-encoded as AU.
Your AIF 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
AIF
.aif file
| Extension | .aif |
| MIME Type | audio/aiff |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert AIF to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
Should I use AIF or AU?
It depends on your goal. AIF preserves full quality. AU preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is AU higher quality than AIF?
Not necessarily. Converting AIF to AU maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert AIF to AU on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for AIF to AU?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for AIF to AU?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.