How to Convert AU to SF — Quick & Free
Fast, instant AU to SF (IRCAM) conversion. No signup required. Just drop your .au file and get .sf in seconds.
Batch Settings
About AU to SF (IRCAM) Conversion
Short answer: yes, you can convert AU to SF online for free, and quality is well preserved with the right settings. Just upload your .au file to CocoConvert, pick SF as the output, and click Convert. The whole process takes seconds.
Now for the details. AU is a widely used file format. SF is a widely used file format. Converting between these two formats lets you convert between formats quickly.
Your AU file is decoded and re-encoded as SF. Converting AU to SF maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert runs entirely online — no software to install, no account to create. Your files are encrypted during upload (TLS), processed on isolated servers in Germany, and permanently deleted after 24 hours. It works in Chrome, Safari, Firefox, Edge, and all mobile browsers.
Need to convert more than one file? Free users can do 5 per hour. Pro gets 100 per hour with files up to 5 GB each.
How to Convert AU to SF (IRCAM)
- 1
1. Upload AU
Drop your .au file onto the page (or tap "Browse" on mobile). Add multiple files for batch conversion.
- 2
2. Select SF
Choose .sf from the output dropdown. Settings are pre-configured for best results.
- 3
3. Convert
One click. The server handles all the heavy lifting using FFmpeg and Sharp.
- 4
4. Download
Your .sf file is ready. Download it directly or get all files as a zip archive.
What Happens When You Convert AU to SF (IRCAM)
Your AU file is decoded and re-encoded as SF.
Your AU file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SF format
The converted file is ready for download
Format Comparison
AU
.au file
| Extension | .au |
| MIME Type | audio/basic |
| Category | Audio |
SF (IRCAM)
.sf file
| Extension | .sf |
| MIME Type | audio/x-sf |
| Category | Audio |
Should You Convert AU to SF (IRCAM)?
When to Convert
- ✓When you need a SF file
Frequently Asked Questions
Is AU to SF conversion free?
Yes. CocoConvert offers free AU to SF conversion with generous daily limits — 25 minutes of processing time and up to 5 files per hour (250 MB each). Pro plans remove these limits.
How fast is AU to SF conversion?
Most files convert in 2–10 seconds depending on size. Large audio files may take 30 seconds. Batch jobs process in parallel for maximum speed.
What happens to my files after conversion?
Your uploaded AU file and the converted SF file are both automatically deleted from our servers within 24 hours. They are never shared, sold, or analysed.
Does converting AU to SF lose quality?
Converting AU to SF maintains high quality with CocoConvert's optimised encoder settings.
Can I convert SF back to AU?
Yes, CocoConvert supports SF to AU conversion as well. However, if the original conversion involved lossy compression, converting back won't recover the lost data.
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