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AU Compressor
Reduce AU file size by re-encoding at a lower bitrate — entirely in your browser.
2 cores · low tier
Drop a file here or click to select
Format will be auto-detected
About AU
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- − Outdated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