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AU Converter Online

Sun audio

Convert AU Files

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Convert AU to Other Formats

Convert your AU files to 18 different formats

AU→MP3 AU→WAV AU→AAC AU→OGG AU→FLAC AU→M4A AU→WMA AU→AIFF AU→OPUS AU→AC3 AU→AMR AU→CAF AU→MKA AU→WV AU→SPX AU→OGA AU→DTS AU→MP2

Convert Other Formats to AU

Convert 18 different formats to AU

MP3→AU WAV→AU AAC→AU OGG→AU FLAC→AU M4A→AU WMA→AU AIFF→AU OPUS→AU AC3→AU AMR→AU CAF→AU MKA→AU WV→AU SPX→AU OGA→AU DTS→AU MP2→AU

AU Converter Features

Why choose our AU converter

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Convert AU to

Convert AU to multiple formats

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Configurable output settings

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Visible job status

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No software needed

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Batch conversion support

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Clear free credits

How to Convert AU Files

Converting AU files is quick and easy

Upload Your File

Drag and drop your file or click to browse. We support over 300 file formats. 💡 Pro Tip: You can drag and drop multiple files at once!

Choose Output Format

Select your desired output format from our comprehensive list of options.

Convert Instantly

Our powerful servers process your file in seconds with high quality results.

Download Result

Download your converted file immediately. Files are kept for 24 hours.

About AU Format

AU AU is a audio format. Sun audio.

AU Technical Details

Full Name: AU
Developer: Various
Compression: Various

Common AU Use Cases

Converting AU files for compatibility
File format optimization
Cross-platform sharing
Archive conversion

Convert AU to Any Format

With FreeFast, you can convert AU files to 18 different formats including MP3, WAV, AAC, OGG, FLAC, M4A, WMA, AIFF and 10 more. Each conversion uses settings for the selected output format, with results depending on the source file and target format.

Convert Any Format to AU

Need to convert files TO AU? We support converting from 18 different formats including MP3, WAV, AAC, OGG, FLAC, M4A, WMA, AIFF and 10 more formats.

Why use FreeFast for AU conversion?

FreeFast is a browser-based AU converter built for practical file jobs. It focuses on clear conversion paths, visible limits, and useful output without installing extra software:

Free daily credits and no watermarks: Start with 10 free daily conversions and download output files without branding.
Bulk/batch converter support: Upload and convert multiple AU files within plan, browser, and file-size limits.
No signup to start: Start converting files without creating an account for your first file jobs.
Quality controls: Conversion settings are chosen for the selected format pair, with results depending on the source file and output type.
Encrypted transfer: Uploads and downloads use HTTPS/TLS, and temporary files are cleared after the processing and deletion window.

FreeFast AU Converter Specification Table

Feature	Specification Details
Max Upload File Size	1 GB (1,000 MB) per conversion
Privacy and Deletion Policy	Configured result-retention window
File Transfer	HTTPS/TLS uploads and downloads
Batch & Bulk Processing	Supported within plan and browser limits
Compatible Operating Systems	Windows, macOS, Linux, iOS, Android, ChromeOS
Account Signup	No signup required for your first file jobs
Watermarks & Visual Edits	None. Output files are clean and unmodified

End-to-End Privacy & File Safety

Files are handled for the conversion you request. Uploads and downloads use HTTPS/TLS, and temporary files are cleared after the processing and deletion window.

Format comparison notes

When choosing between formats, understanding key attributes helps optimize quality and compatibility:

Strengths of AU

Authoritative standard optimized for high compatibility.
Exceptional balance between quality and file footprint.
Supported out of the box by modern browsers, editors, and OS.

Quality and compression

While converting files, the processor handles scaling, color spaces, metadata, and bitrates where the selected workflow supports them. Review downloaded files before sharing important work.

FreeFast converter link badge

Add a simple link badge to a help article, intranet page, or workflow checklist when readers need a direct AU conversion shortcut:

HTML Embed CodeResponsive Badge

<a href="https://freefastconverter.com/converter/audio/au-converter" target="_blank" style="display:inline-flex;align-items:center;gap:8px;padding:10px 18px;background:#f97316;color:#ffffff;font-family:sans-serif;font-weight:600;border-radius:12px;text-decoration:none;font-size:14px;box-shadow:0 4px 12px rgba(249,115,22,0.25)">Open AU Converter</a>

Other Audio Formats

mp3 wav aac ogg flac m4a wma aiff opus ac3

AU Converter FAQ

What is a AU file?

AU is a audio file format. You can convert AU files using the browser-based converter.

How do I convert AU files?

Upload your AU file, select your desired output format, and click Convert.

Is the AU converter free?

You can start with free daily conversions. Accounts and paid plans are available for higher-volume work.

Ready to Convert Your AU Files?

Start with 10 free daily conversions. No signup required for your first file jobs.

Convert Now

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