Audio Conversion
Convert AU to MP3 Online — Free
Fast, free AU to MP3 converter. No registration required.
またはインポート元
200万以上のファイル変換
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処理後にファイルを自動削除
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すぐに変換を開始
どこでも動作
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変換方法
1
Upload your .au file by dragging it into the upload area or clicking to browse.
2
Choose your output settings. The default settings work great for most files.
3
Click Convert and download your .mp3 file when it's ready.
AUとは？
AU is an audio format created by Sun Microsystems. It's one of the oldest digital audio formats, commonly used on Unix and Java platforms.
形式の詳細
- 正式名称
- Sun Microsystems Audio
- 拡張子
- .au
主な特徴
- Unix standard
- Java audio
- Simple format
- Legacy support
MP3とは？
MP3 is the most popular audio format worldwide. It uses lossy compression to reduce file size while maintaining acceptable audio quality for most listeners.
形式の詳細
- 正式名称
- MPEG Audio Layer III
- 拡張子
- .mp3
主な特徴
- Universal compatibility
- Small file sizes
- Streaming support
- ID3 tag support
AUとMP3の比較
| 特徴 | AU | MP3 |
|---|---|---|
| 正式名称 | Sun Microsystems Audio | MPEG Audio Layer III |
| 拡張子 | .au | .mp3 |
| 最適な用途 | Unix standard | Universal compatibility |
よくある質問
Converting between lossless formats preserves perfect quality. When converting to lossy formats, our optimized encoding minimizes any audible difference. You can adjust bitrate to control quality vs. file size.
We preserve ID3 tags, album art, and metadata when both AU and MP3 support them. Some metadata may not transfer between incompatible formats.
Pro users can batch convert multiple audio files simultaneously. Free users convert one file at a time with up to 5 free conversions per day.
We support all standard sample rates from 8kHz (voice) up to 192kHz (studio quality). The default preserves your source file's sample rate.
Yes. Our audio converter handles music, podcasts, voice memos, and audiobook files. For podcasts, we recommend MP3 at 128-192kbps for the best balance of quality and file size.