ADTS vs AU — Comparison & Free Converter
Fast, instant ADTS to AU conversion. No signup required. Just drop your .adts file and get .au in seconds.
Batch Settings
About ADTS to AU Conversion
ADTS or AU — which format should you use? The answer depends on your needs. Here's a quick breakdown.
ADTS 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 ADTS to AU? This conversion is ideal when you When you need a AU file. This conversion helps you convert between formats quickly.
Converting ADTS 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 .adts 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 ADTS to AU
- 1
Choose your ADTS file
Upload your .adts 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 ADTS to AU
Your ADTS file is decoded and re-encoded as AU.
Your ADTS 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
ADTS
.adts file
| Extension | .adts |
| MIME Type | audio/aac |
| Category | Audio |
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
Should You Convert ADTS to AU?
When to Convert
- ✓When you need a AU file
Frequently Asked Questions
Should I use ADTS or AU?
It depends on your goal. ADTS 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 ADTS?
Not necessarily. Converting ADTS 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 ADTS 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 ADTS 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 ADTS 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.