AU
Sun Audio
An early audio format created by Sun Microsystems for Unix environments.
Commonly used for
Legacy Unix sound files
AU to WAV Converter
Convert AU files to WAV free in your browser — no signup, no install, and the file is never uploaded to a server. WAV opens almost anywhere, so the result works where AU did not.
Completely free
Files are never uploaded
No signup required
Drop files or click to select
AU → WAV
What changes in this conversion
- WAV opens almost everywhere, so the converted file will work on devices and programs that refused the original AU.
How to use
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Add your AU file
Drag the AU file onto the drop area above, or click it to pick a file from your device. You can add several files at once.
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Confirm WAV as the output
WAV is already selected as the output format on this page. You can pick the bitrate — higher keeps more of the sound, lower makes a smaller file.
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Run the conversion
Press the convert button. Audio decodes and re-encodes in your browser — a normal song finishes in a few seconds.
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Download the WAV file
When it finishes, download the WAV file. Converting multiple files gives you the option to download them together as a ZIP.
About these formats
WAV
WAV Audio
Stores uncompressed, original-quality audio. There is no quality loss, but files are very large at roughly 10MB per minute.
Commonly used for
Music production, master recordings, audio editing
Frequently asked questions
Is converting AU to WAV really free?
Yes. AU to WAV conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.
Are my AU files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so the AU file never leaves your device. That is also why it works without an internet connection once the page has loaded.
Does the WAV file get bigger than the AU?
It can go either way. Both formats are lossless, so nothing is thrown away — the size difference comes from how each one packs the same data.
Is there a file size limit for AU to WAV conversion?
The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.
Convert AU files to other formats
Convert other formats to WAV
Audio converter
What each file format is, what it is used for, and which formats it can be converted to.
Open converter Browse the full format reference