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AU File Format

Sun Microsystems Audio category

AU は Sun が定めた初期の音声形式です。Unix 由来の音声資産に今も残っています。

Typical use: 古い AU 音声を WAV/MP3 に変換して再生します。

About the AU format

AU は Sun が定めた初期の音声形式です。Unix 由来の音声資産に今も残っています。

現在は WAV/MP3 が主流です。古い素材を現代の環境で再生するには変換が便利です。

Strengths

  • ✓ 構造が単純
  • ✓ 古い Unix 資産を読める

Limitations

  • ✗ 現在は利用が少ない
  • ✗ 機能が限定的
Compression
µ-law or PCM
Quality
Mono voice-grade (µ-law)
Compatibility
Legacy Unix tools
Best for
Old system sounds and recordings

Convert AU to…

26 direct directions plus 21 workflows, sorted A–Z; 🔥 marks popular targets.

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Frequently asked questions

What is a AU file?

AU is the µ-law audio format of old Unix systems and Java applets — tiny mono files from another era.

How do I convert AU files online?

Pick a target format from the "Convert AU to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert AU files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can AU convert to?

This page lists all 47 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.