SMP vs AU — Comparison & Free Converter
Fast, instant SMP to AU conversion. No signup required. Just drop your .smp file and get .au in seconds.
Batch Settings
SMPファイルをAU形式へ変換する際、その必要性や手軽さについてお考えになったことはございますか？特に、音声データを扱う専門職の方々や、クリアな音質を求めるクリエイターの方々にとって、適切なファイル形式の選択は、作品の質を左右する重要な要素となります。当ツールは、煩雑な手順を省き、直感的な操作でSMPファイルをAU形式に変換できるよう設計されています。複雑な設定は一切不要。アップロードして変換ボタンを押すだけで、お客様の貴重なデータが、より汎用性の高い、そして多くの環境でスムーズに再生可能なAU形式へと生まれ変わります。大切なプレゼンテーションの音声、趣味で録音したサウンドスケープ、あるいはビジネスにおける重要な議事録など、あらゆるシーンでその真価を発揮することでしょう。品質を損なうことなく、迅速かつ確実に変換を行うことで、お客様の作業効率を飛躍的に向上させます。
- アニメ制作における音声編集
- ビジネス会議録のアーカイブ
- 伝統芸能の音源保存
日本では、特に古い音響機器や一部の業務用システムでAU形式が依然として利用されることがあります。そのため、SMPからAUへの変換需要は、特定のニッチな分野で根強く存在します。
About SMP to AU Conversion
SMP or AU — which format should you use? The answer depends on your needs. Here's a quick breakdown.
SMP 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 SMP to AU? This conversion is ideal when you When you need a AU file. This conversion helps you convert between formats quickly.
Converting SMP 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 .smp 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 SMP to AU
- 1
Choose your SMP file
Upload your .smp 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 SMP to AU
Your SMP file is decoded and re-encoded as AU.
Your SMP 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
SMP
.smp file
| Extension | .smp |
| MIME Type | audio/x-smp |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert SMP to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
Should I use SMP or AU?
It depends on your goal. SMP 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 SMP?
Not necessarily. Converting SMP 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 SMP 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 SMP 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 SMP 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.