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Convert MP3 to AU
Convert MP3 to AU format — 100% browser-based, no upload required.
2 cores · low tier
Drop a file here or click to select
Format will be auto-detected
About these formats
Source
MP3
MPEG Audio Layer 3The most popular lossy audio format. Revolutionized digital music with good quality at small file sizes, supported by virtually every device.
Best for
Music filesPodcastsAudiobooksUniversal playback
Advantages
- + Universal support
- + Small file size
- + Good quality at 192+ kbps
- + Album art support
Limitations
- − Lossy compression
- − Quality loss at low bitrate
- − Not ideal for archival
Target
AU
Sun/NeXT AudioSimple audio format from Sun Microsystems. Originally used in Unix systems and Java audio. Typically stores µ-law compressed audio.
Best for
Unix/Java audioLegacy systemsSimple audio storage
Advantages
- + Simple format
- + Java support
- + Compact for telephony
Limitations
- − Outdated
- − Low quality
- − Limited use