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.