iLoveConverter
Categories 11 categories
Image Converters PDF & Document Tools Data & Text Converters Video Converters Audio Converters Archive Converters Font Converters 3D Model Converters Ebook Converters Presentation Converters CAD Converters All formats & converters →

AU File Format

Sun Microsystems Audio category

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

Typical use: Converting AU to WAV preserves the samples in a format every modern tool reads.

About the AU format

AU is Sun Microsystems' audio format from the Unix workstation age: a small header followed by µ-law (or PCM) samples. Java's applet era shipped it everywhere, and old Unix sound tooling still emits it.

Modern players increasingly skip it. Converting AU to WAV preserves the samples bit-for-bit while moving the file into universal territory — the standard rescue path for system sounds and old recordings.

Strengths

  • ✓ Simple, lossless sample storage
  • ✓ Native to old Unix/Java tooling

Limitations

  • ✗ µ-law flavor sounds dated and mono
  • ✗ Dropped by modern players
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 18 workflows, sorted A–Z; 🔥 marks popular targets.

AU to AAC Hot AU to AC3 AU to AIF AU to AIFF AU to ALAC AU to CAF AU to E-AC3 AU to F4A AU to F4B AU to FLAC Hot AU to GSM AU to M4A Hot AU to M4B AU to M4R AU to MP2 AU to MP3 Hot AU to OGA AU to OGG Hot AU to OPUS AU to PCM AU to TTA AU to VOC AU to W64 AU to WAV Hot AU to WAVPCM AU to WV

Cross-engine workflows

AU to 7Z AU to APK AU to JAR AU to MKV AU to MOV AU to MP4 AU to PNG AU to PNG24 AU to PNG8 AU to TAR AU to TAR.BZ2 AU to TAR.GZ AU to TAR.XZ AU to TBZ2 AU to TGZ AU to TXZ AU to WIM AU to ZIP

Convert other files to AU…

AAC to AU Hot AC3 to AU AIF to AU AIFF to AU ALAC to AU AMB to AU AMR to AU APE to AU AVR to AU CAF to AU CVS to AU CVU to AU DSS to AU DTS to AU E-AC3 to AU F32 to AU F4A to AU F4B to AU F64 to AU FAP to AU FLAC to AU Hot FSSD to AU GSM to AU GSRT to AU HCOM to AU HTK to AU IRCAM to AU M4A to AU Hot M4B to AU M4R to AU MAUD to AU MOD to AU MP2 to AU MP3 to AU Hot OGA to AU OGG to AU Hot OMA to AU OPUS to AU PAF to AU PVF to AU QCP to AU S16 to AU S24 to AU S32 to AU S3M to AU SD2 to AU SHN to AU SMP to AU SNDR to AU SNDT to AU SPX to AU TAK to AU TTA to AU TXW to AU U8 to AU VMS to AU VOC to AU VQF to AU W64 to AU WAV to AU Hot WAVPCM to AU WMA to AU WV to AU WVE to AU XI to AU XM to AU

Cross-engine workflows

3G2 to AU 3GP to AU ASF to AU AVI to AU DivX to AU DV to AU F4V to AU FLV to AU H.264 to AU M1V to AU M2TS to AU M2V to AU M4V to AU MJPEG to AU MKV to AU MOV to AU MP4 to AU MPEG to AU MPEG1 to AU MPEG2 to AU MPEG4 to AU MPG to AU MTS to AU MXF to AU OGV to AU RM to AU RMVB to AU TS to AU VOB to AU WEBM to AU WMV to AU WTV to AU Xvid to AU Y4M to AU

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