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
Vous manipulez des fichiers audio et souhaitez passer du format SMP (Sound Manager Packet) au format AU (Audio mu-law) ? Que ce soit pour des raisons de compatibilité logicielle, d'archivage ou de diffusion, cette conversion peut s'avérer nécessaire. Le format AU, historiquement lié aux systèmes Unix et Sun Microsystems, reste pertinent pour sa simplicité et sa bonne acceptation par de nombreux lecteurs audio, notamment dans des contextes où la robustesse et la compatibilité multiplateforme priment sur la compression la plus avancée. Notre outil vous guide pas à pas pour transformer vos fichiers SMP en AU, garantissant une transition fluide et une préservation optimale de la qualité sonore. Simplifiez vos workflows audio sans compromis sur la fidélité de vos enregistrements.
- Archivage de bandes sonores pour la RTBF
- Compatibilité logicielle pour études universitaires au Québec
- Échanges audio simplifiés en agence de design suisse
Bien que moins courant en Europe continentale pour les nouvelles productions, le format AU est encore rencontré dans l'héritage de systèmes informatiques plus anciens, notamment dans les institutions publiques ou académiques, nécessitant parfois une conversion pour l'intégration à des plateformes modernes.
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.