AU vs HTK — Comparison & Free Converter
Fast, instant AU to HTK conversion. No signup required. Just drop your .au file and get .htk in seconds.
Batch Settings
About AU to HTK Conversion
AU or HTK — which format should you use? The answer depends on your needs. Here's a quick breakdown.
AU is a widely used file format. It has common platform support. HTK is a widely used file format. It has common platform support.
So when should you convert AU to HTK? This conversion is ideal when you When you need a HTK file. This conversion helps you convert between formats quickly.
Converting AU to HTK maintains high quality with CocoConvert's optimised encoder settings.
If you've decided HTK is the right choice, CocoConvert makes the conversion effortless. Upload your .au file, pick HTK, 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 AU to HTK
- 1
Choose your AU file
Upload your .au file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to HTK
Select .htk 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 HTK file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert AU to HTK
Your AU file is decoded and re-encoded as HTK.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in HTK format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
HTK
.htk file
| Extension | .htk |
| MIME Type | audio/x-htk |
| Category | Audio |
Should You Convert AU to HTK?
When to Convert
- ✓When you need a HTK file
Frequently Asked Questions
Should I use AU or HTK?
It depends on your goal. AU preserves full quality. HTK preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is HTK higher quality than AU?
Not necessarily. Converting AU to HTK 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 AU to HTK 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 AU to HTK?
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 AU to HTK?
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.