AU vs WEBM — Comparison & Free Converter
Fast, instant AU to WEBM conversion. No signup required. Just drop your .au file and get .webm in seconds.
Batch Settings
About AU to WEBM Conversion
AU or WEBM — 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. WebM is Google's open media format based on VP8/VP9/AV1 codecs, optimised for web streaming. It has limited platform support.
So when should you convert AU to WEBM? This conversion is ideal when you When you need a WEBM file. This conversion helps you convert between formats quickly.
Converting AU to WEBM maintains high quality with CocoConvert's optimised encoder settings.
If you've decided WEBM is the right choice, CocoConvert makes the conversion effortless. Upload your .au file, pick WEBM, 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 WEBM
- 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 WEBM
Select .webm 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 WEBM file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert AU to WEBM
Your AU file is decoded and re-encoded as WEBM.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in WEBM format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
WebM
.webm file
| Extension | .webm |
| MIME Type | video/webm |
| Category | Audio |
Should You Convert AU to WEBM?
When to Convert
- ✓When you need a WEBM file
Frequently Asked Questions
Should I use AU or WEBM?
It depends on your goal. AU preserves full quality. WEBM offers smaller files via lossy compression. Choose based on whether file size or quality matters more for your use case.
Is WEBM higher quality than AU?
Not necessarily. Converting AU to WEBM 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 WEBM 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 WEBM?
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 WEBM?
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.