.auaudio/basic

AU (.au)

AU (Audio) is a simple audio format developed by Sun Microsystems. Used primarily in Unix/Linux systems and Java applications.

Quick Facts

File Extension
.au
MIME Type
audio/basic
Category
Audio
Full Name
AU

What is AU?

The AU file format, also known as Sun Audio, is a simple audio file format developed by Sun Microsystems. Originally designed for use in Unix systems, it became a standard for audio data in early Java applications and web browsers. Its straightforward structure makes it easy to parse and implement, contributing to its longevity in legacy systems across the computing industry.

Technically, the AU format supports various audio encodings, including uncompressed PCM and compressed μ-law or A-law algorithms. While it was once prevalent on the early web for sound effects and clips, its usage has declined in favor of more modern formats like MP3 and WAV. However, it remains a recognizable standard for audio storage in specific Unix-based environments.

Despite being considered a legacy format today, AU files are still supported by most major media players and operating systems. They are often encountered in older software archives or specific scientific audio recordings. For developers working with Java or Unix legacy code, understanding the AU format remains relevant for compatibility and data migration purposes.

Technical Specifications

DeveloperSun Microsystems
First Released1985
TypeAudio
CompressionUncompressed or μ-law/A-law
Max ResolutionVaries by Sample Rate
Color DepthN/A

Pros & Cons

+Advantages

  • •Simple and easy to implement structure
  • •Native support in Unix and Linux systems
  • •Small file size when using compression
  • •Integrated support in Java applications

−Disadvantages

  • •Obsolete for modern web streaming
  • •Limited metadata support compared to MP3
  • •Lower audio quality than lossless formats

Common Use Cases

Legacy Unix system audio storage

Java applet sound effects

Voice recording archives

Scientific audio data transfer

Convert from AU

Convert .au files to other formats.

.au.jpg

Convert AU (.au) files to JPEG (.jpg) format. Transform your AU files to JPG quickly and easily with File ConverterX — completely free.

.au.png

Convert AU (.au) files to PNG (.png) format. Transform your AU files to PNG quickly and easily with File ConverterX — completely free.

.au.webp

Convert AU (.au) files to WebP (.webp) format. Transform your AU files to WEBP quickly and easily with File ConverterX — completely free.

.au.gif

Convert AU (.au) files to GIF (.gif) format. Transform your AU files to GIF quickly and easily with File ConverterX — completely free.

.au.mp4

Convert AU (.au) files to MP4 (.mp4) format. Transform your AU files to MP4 quickly and easily with File ConverterX — completely free.

.au.mp3

Convert AU (.au) files to MP3 (.mp3) format. Transform your AU files to MP3 quickly and easily with File ConverterX — completely free.

.au.wav

Convert AU (.au) files to WAV (.wav) format. Transform your AU files to WAV quickly and easily with File ConverterX — completely free.

.au.flac

Convert AU (.au) files to FLAC (.flac) format. Transform your AU files to FLAC quickly and easily with File ConverterX — completely free.

.au.avif

Convert AU (.au) files to AVIF (.avif) format. Transform your AU files to AVIF quickly and easily with File ConverterX — completely free.

.au.mov

Convert AU (.au) files to MOV (.mov) format. Transform your AU files to MOV quickly and easily with File ConverterX — completely free.

.au.mkv

Convert AU (.au) files to MKV (.mkv) format. Transform your AU files to MKV quickly and easily with File ConverterX — completely free.

.au.avi

Convert AU (.au) files to AVI (.avi) format. Transform your AU files to AVI quickly and easily with File ConverterX — completely free.

.au.ogg

Convert AU (.au) files to OGG Vorbis (.ogg) format. Transform your AU files to OGG quickly and easily with File ConverterX — completely free.

.au.aac

Convert AU (.au) files to AAC (.aac) format. Transform your AU files to AAC quickly and easily with File ConverterX — completely free.

.au.m4a

Convert AU (.au) files to M4A (.m4a) format. Transform your AU files to M4A quickly and easily with File ConverterX — completely free.

.au.tiff

Convert AU (.au) files to TIFF (.tiff) format. Transform your AU files to TIFF quickly and easily with File ConverterX — completely free.

.au.bmp

Convert AU (.au) files to BMP (.bmp) format. Transform your AU files to BMP quickly and easily with File ConverterX — completely free.

.au.xml

Convert AU (.au) files to XML (.xml) format. Transform your AU files to XML quickly and easily with File ConverterX — completely free.

.au.webm

Convert AU (.au) files to WebM (.webm) format. Transform your AU files to WEBM quickly and easily with File ConverterX — completely free.

.au.wmv

Convert AU (.au) files to WMV (.wmv) format. Transform your AU files to WMV quickly and easily with File ConverterX — completely free.

.au.wma

Convert AU (.au) files to WMA (.wma) format. Transform your AU files to WMA quickly and easily with File ConverterX — completely free.

.au.opus

Convert AU (.au) files to Opus (.opus) format. Transform your AU files to OPUS quickly and easily with File ConverterX — completely free.

.au.ico

Convert AU (.au) files to ICO (.ico) format. Transform your AU files to ICO quickly and easily with File ConverterX — completely free.

.au.jxl

Convert AU (.au) files to JPEG XL (.jxl) format. Transform your AU files to JXL quickly and easily with File ConverterX — completely free.

.au.apng

Convert AU (.au) files to APNG (.apng) format. Transform your AU files to APNG quickly and easily with File ConverterX — completely free.

.au.3gp

Convert AU (.au) files to 3GP (.3gp) format. Transform your AU files to 3GP quickly and easily with File ConverterX — completely free.

.au.m4v

Convert AU (.au) files to M4V (.m4v) format. Transform your AU files to M4V quickly and easily with File ConverterX — completely free.

.au.aiff

Convert AU (.au) files to AIFF (.aiff) format. Transform your AU files to AIFF quickly and easily with File ConverterX — completely free.

.au.3g2

Convert AU (.au) files to 3G2 (.3g2) format. Transform your AU files to 3G2 quickly and easily with File ConverterX — completely free.

.au.ac3

Convert AU (.au) files to AC3 (.ac3) format. Transform your AU files to AC3 quickly and easily with File ConverterX — completely free.

.au.amr

Convert AU (.au) files to AMR (.amr) format. Transform your AU files to AMR quickly and easily with File ConverterX — completely free.

.au.amv

Convert AU (.au) files to AMV (.amv) format. Transform your AU files to AMV quickly and easily with File ConverterX — completely free.

.au.asf

Convert AU (.au) files to ASF (.asf) format. Transform your AU files to ASF quickly and easily with File ConverterX — completely free.

.au.caf

Convert AU (.au) files to CAF (.caf) format. Transform your AU files to CAF quickly and easily with File ConverterX — completely free.

.au.dfpwm

Convert AU (.au) files to DFPWM (.dfpwm) format. Transform your AU files to DFPWM quickly and easily with File ConverterX — completely free.

.au.dpx

Convert AU (.au) files to DPX (.dpx) format. Transform your AU files to DPX quickly and easily with File ConverterX — completely free.

.au.dts

Convert AU (.au) files to DTS (.dts) format. Transform your AU files to DTS quickly and easily with File ConverterX — completely free.

.au.dv

Convert AU (.au) files to DV (.dv) format. Transform your AU files to DV quickly and easily with File ConverterX — completely free.

.au.eac3

Convert AU (.au) files to E-AC3 (.eac3) format. Transform your AU files to EAC3 quickly and easily with File ConverterX — completely free.

.au.exr

Convert AU (.au) files to OpenEXR (.exr) format. Transform your AU files to EXR quickly and easily with File ConverterX — completely free.

.au.f4v

Convert AU (.au) files to F4V (.f4v) format. Transform your AU files to F4V quickly and easily with File ConverterX — completely free.

.au.fits

Convert AU (.au) files to FITS (.fits) format. Transform your AU files to FITS quickly and easily with File ConverterX — completely free.

.au.flv

Convert AU (.au) files to FLV (.flv) format. Transform your AU files to FLV quickly and easily with File ConverterX — completely free.

.au.gsm

Convert AU (.au) files to GSM (.gsm) format. Transform your AU files to GSM quickly and easily with File ConverterX — completely free.

.au.gxf

Convert AU (.au) files to GXF (.gxf) format. Transform your AU files to GXF quickly and easily with File ConverterX — completely free.

.au.hdr

Convert AU (.au) files to HDR (.hdr) format. Transform your AU files to HDR quickly and easily with File ConverterX — completely free.

.au.ivf

Convert AU (.au) files to IVF (.ivf) format. Transform your AU files to IVF quickly and easily with File ConverterX — completely free.

.au.j2k

Convert AU (.au) files to JPEG 2000 (.j2k) format. Transform your AU files to J2K quickly and easily with File ConverterX — completely free.

.au.jp2

Convert AU (.au) files to JPEG 2000 (.jp2) format. Transform your AU files to JP2 quickly and easily with File ConverterX — completely free.

.au.m2ts

Convert AU (.au) files to M2TS (.m2ts) format. Transform your AU files to M2TS quickly and easily with File ConverterX — completely free.

.au.m4b

Convert AU (.au) files to M4B (.m4b) format. Transform your AU files to M4B quickly and easily with File ConverterX — completely free.

.au.mlp

Convert AU (.au) files to MLP (.mlp) format. Transform your AU files to MLP quickly and easily with File ConverterX — completely free.

.au.mmf

Convert AU (.au) files to SMAF (.mmf) format. Transform your AU files to MMF quickly and easily with File ConverterX — completely free.

.au.mp2

Convert AU (.au) files to MP2 (.mp2) format. Transform your AU files to MP2 quickly and easily with File ConverterX — completely free.

.au.mpeg

Convert AU (.au) files to MPEG (.mpeg) format. Transform your AU files to MPEG quickly and easily with File ConverterX — completely free.

.au.mts

Convert AU (.au) files to MTS (.mts) format. Transform your AU files to MTS quickly and easily with File ConverterX — completely free.

.au.mxf

Convert AU (.au) files to MXF (.mxf) format. Transform your AU files to MXF quickly and easily with File ConverterX — completely free.

.au.nut

Convert AU (.au) files to NUT (.nut) format. Transform your AU files to NUT quickly and easily with File ConverterX — completely free.

.au.oga

Convert AU (.au) files to OGA (.oga) format. Transform your AU files to OGA quickly and easily with File ConverterX — completely free.

.au.ogv

Convert AU (.au) files to OGV (.ogv) format. Transform your AU files to OGV quickly and easily with File ConverterX — completely free.

.au.pam

Convert AU (.au) files to PAM (.pam) format. Transform your AU files to PAM quickly and easily with File ConverterX — completely free.

.au.pbm

Convert AU (.au) files to PBM (.pbm) format. Transform your AU files to PBM quickly and easily with File ConverterX — completely free.

.au.pcm

Convert AU (.au) files to PCM (.pcm) format. Transform your AU files to PCM quickly and easily with File ConverterX — completely free.

.au.pcx

Convert AU (.au) files to PCX (.pcx) format. Transform your AU files to PCX quickly and easily with File ConverterX — completely free.

.au.pgm

Convert AU (.au) files to PGM (.pgm) format. Transform your AU files to PGM quickly and easily with File ConverterX — completely free.

.au.ppm

Convert AU (.au) files to PPM (.ppm) format. Transform your AU files to PPM quickly and easily with File ConverterX — completely free.

.au.qoi

Convert AU (.au) files to QOI (.qoi) format. Transform your AU files to QOI quickly and easily with File ConverterX — completely free.

.au.ra

Convert AU (.au) files to RealAudio (.ra) format. Transform your AU files to RA quickly and easily with File ConverterX — completely free.

.au.rm

Convert AU (.au) files to RealMedia (.rm) format. Transform your AU files to RM quickly and easily with File ConverterX — completely free.

.au.roq

Convert AU (.au) files to RoQ (.roq) format. Transform your AU files to ROQ quickly and easily with File ConverterX — completely free.

.au.sbc

Convert AU (.au) files to SBC (.sbc) format. Transform your AU files to SBC quickly and easily with File ConverterX — completely free.

.au.sgi

Convert AU (.au) files to SGI (.sgi) format. Transform your AU files to SGI quickly and easily with File ConverterX — completely free.

.au.sox

Convert AU (.au) files to SoX (.sox) format. Transform your AU files to SOX quickly and easily with File ConverterX — completely free.

.au.spx

Convert AU (.au) files to Speex (.spx) format. Transform your AU files to SPX quickly and easily with File ConverterX — completely free.

.au.swf

Convert AU (.au) files to SWF (.swf) format. Transform your AU files to SWF quickly and easily with File ConverterX — completely free.

.au.tga

Convert AU (.au) files to TGA (.tga) format. Transform your AU files to TGA quickly and easily with File ConverterX — completely free.

.au.ts

Convert AU (.au) files to TS (.ts) format. Transform your AU files to TS quickly and easily with File ConverterX — completely free.

.au.tta

Convert AU (.au) files to TTA (.tta) format. Transform your AU files to TTA quickly and easily with File ConverterX — completely free.

.au.vob

Convert AU (.au) files to VOB (.vob) format. Transform your AU files to VOB quickly and easily with File ConverterX — completely free.

.au.voc

Convert AU (.au) files to VOC (.voc) format. Transform your AU files to VOC quickly and easily with File ConverterX — completely free.

.au.w64

Convert AU (.au) files to W64 (.w64) format. Transform your AU files to W64 quickly and easily with File ConverterX — completely free.

.au.wbmp

Convert AU (.au) files to WBMP (.wbmp) format. Transform your AU files to WBMP quickly and easily with File ConverterX — completely free.

.au.wv

Convert AU (.au) files to WavPack (.wv) format. Transform your AU files to WV quickly and easily with File ConverterX — completely free.

.au.xbm

Convert AU (.au) files to XBM (.xbm) format. Transform your AU files to XBM quickly and easily with File ConverterX — completely free.

.au.xwd

Convert AU (.au) files to XWD (.xwd) format. Transform your AU files to XWD quickly and easily with File ConverterX — completely free.

.au.y4m

Convert AU (.au) files to YUV4MPEG (.y4m) format. Transform your AU files to Y4M quickly and easily with File ConverterX — completely free.

Convert to AU

Convert other files to .au format.

.jpg.au

Convert JPEG (.jpg) files to AU (.au) format. Transform your JPG files to AU quickly and easily with File ConverterX — completely free.

.png.au

Convert PNG (.png) files to AU (.au) format. Transform your PNG files to AU quickly and easily with File ConverterX — completely free.

.webp.au

Convert WebP (.webp) files to AU (.au) format. Transform your WEBP files to AU quickly and easily with File ConverterX — completely free.

.gif.au

Convert GIF (.gif) files to AU (.au) format. Transform your GIF files to AU quickly and easily with File ConverterX — completely free.

.mp4.au

Convert MP4 (.mp4) files to AU (.au) format. Transform your MP4 files to AU quickly and easily with File ConverterX — completely free.

.mp3.au

Convert MP3 (.mp3) files to AU (.au) format. Transform your MP3 files to AU quickly and easily with File ConverterX — completely free.

.wav.au

Convert WAV (.wav) files to AU (.au) format. Transform your WAV files to AU quickly and easily with File ConverterX — completely free.

.flac.au

Convert FLAC (.flac) files to AU (.au) format. Transform your FLAC files to AU quickly and easily with File ConverterX — completely free.

.svg.au

Convert SVG (.svg) files to AU (.au) format. Transform your SVG files to AU quickly and easily with File ConverterX — completely free.

.avif.au

Convert AVIF (.avif) files to AU (.au) format. Transform your AVIF files to AU quickly and easily with File ConverterX — completely free.

.mov.au

Convert MOV (.mov) files to AU (.au) format. Transform your MOV files to AU quickly and easily with File ConverterX — completely free.

.mkv.au

Convert MKV (.mkv) files to AU (.au) format. Transform your MKV files to AU quickly and easily with File ConverterX — completely free.

.avi.au

Convert AVI (.avi) files to AU (.au) format. Transform your AVI files to AU quickly and easily with File ConverterX — completely free.

.ogg.au

Convert OGG Vorbis (.ogg) files to AU (.au) format. Transform your OGG files to AU quickly and easily with File ConverterX — completely free.

.aac.au

Convert AAC (.aac) files to AU (.au) format. Transform your AAC files to AU quickly and easily with File ConverterX — completely free.

.m4a.au

Convert M4A (.m4a) files to AU (.au) format. Transform your M4A files to AU quickly and easily with File ConverterX — completely free.

.tiff.au

Convert TIFF (.tiff) files to AU (.au) format. Transform your TIFF files to AU quickly and easily with File ConverterX — completely free.

.bmp.au

Convert BMP (.bmp) files to AU (.au) format. Transform your BMP files to AU quickly and easily with File ConverterX — completely free.

.txt.au

Convert Plain Text (.txt) files to AU (.au) format. Transform your TXT files to AU quickly and easily with File ConverterX — completely free.

.stl.au

Convert STL (.stl) files to AU (.au) format. Transform your STL files to AU quickly and easily with File ConverterX — completely free.

.webm.au

Convert WebM (.webm) files to AU (.au) format. Transform your WEBM files to AU quickly and easily with File ConverterX — completely free.

.wma.au

Convert WMA (.wma) files to AU (.au) format. Transform your WMA files to AU quickly and easily with File ConverterX — completely free.

.opus.au

Convert Opus (.opus) files to AU (.au) format. Transform your OPUS files to AU quickly and easily with File ConverterX — completely free.

.ico.au

Convert ICO (.ico) files to AU (.au) format. Transform your ICO files to AU quickly and easily with File ConverterX — completely free.

.jxl.au

Convert JPEG XL (.jxl) files to AU (.au) format. Transform your JXL files to AU quickly and easily with File ConverterX — completely free.

.apng.au

Convert APNG (.apng) files to AU (.au) format. Transform your APNG files to AU quickly and easily with File ConverterX — completely free.

.3gp.au

Convert 3GP (.3gp) files to AU (.au) format. Transform your 3GP files to AU quickly and easily with File ConverterX — completely free.

.m4v.au

Convert M4V (.m4v) files to AU (.au) format. Transform your M4V files to AU quickly and easily with File ConverterX — completely free.

.aiff.au

Convert AIFF (.aiff) files to AU (.au) format. Transform your AIFF files to AU quickly and easily with File ConverterX — completely free.

.3g2.au

Convert 3G2 (.3g2) files to AU (.au) format. Transform your 3G2 files to AU quickly and easily with File ConverterX — completely free.

.ac3.au

Convert AC3 (.ac3) files to AU (.au) format. Transform your AC3 files to AU quickly and easily with File ConverterX — completely free.

.amf.au

Convert AMF (.amf) files to AU (.au) format. Transform your AMF files to AU quickly and easily with File ConverterX — completely free.

.amr.au

Convert AMR (.amr) files to AU (.au) format. Transform your AMR files to AU quickly and easily with File ConverterX — completely free.

.asf.au

Convert ASF (.asf) files to AU (.au) format. Transform your ASF files to AU quickly and easily with File ConverterX — completely free.

.caf.au

Convert CAF (.caf) files to AU (.au) format. Transform your CAF files to AU quickly and easily with File ConverterX — completely free.

.dds.au

Convert DDS (.dds) files to AU (.au) format. Transform your DDS files to AU quickly and easily with File ConverterX — completely free.

.dfpwm.au

Convert DFPWM (.dfpwm) files to AU (.au) format. Transform your DFPWM files to AU quickly and easily with File ConverterX — completely free.

.dts.au

Convert DTS (.dts) files to AU (.au) format. Transform your DTS files to AU quickly and easily with File ConverterX — completely free.

.dv.au

Convert DV (.dv) files to AU (.au) format. Transform your DV files to AU quickly and easily with File ConverterX — completely free.

.eac3.au

Convert E-AC3 (.eac3) files to AU (.au) format. Transform your EAC3 files to AU quickly and easily with File ConverterX — completely free.

.f4v.au

Convert F4V (.f4v) files to AU (.au) format. Transform your F4V files to AU quickly and easily with File ConverterX — completely free.

.fits.au

Convert FITS (.fits) files to AU (.au) format. Transform your FITS files to AU quickly and easily with File ConverterX — completely free.

.flv.au

Convert FLV (.flv) files to AU (.au) format. Transform your FLV files to AU quickly and easily with File ConverterX — completely free.

.gsm.au

Convert GSM (.gsm) files to AU (.au) format. Transform your GSM files to AU quickly and easily with File ConverterX — completely free.

.gxf.au

Convert GXF (.gxf) files to AU (.au) format. Transform your GXF files to AU quickly and easily with File ConverterX — completely free.

.ivf.au

Convert IVF (.ivf) files to AU (.au) format. Transform your IVF files to AU quickly and easily with File ConverterX — completely free.

.j2k.au

Convert JPEG 2000 (.j2k) files to AU (.au) format. Transform your J2K files to AU quickly and easily with File ConverterX — completely free.

.m4b.au

Convert M4B (.m4b) files to AU (.au) format. Transform your M4B files to AU quickly and easily with File ConverterX — completely free.

.mlp.au

Convert MLP (.mlp) files to AU (.au) format. Transform your MLP files to AU quickly and easily with File ConverterX — completely free.

.mmf.au

Convert SMAF (.mmf) files to AU (.au) format. Transform your MMF files to AU quickly and easily with File ConverterX — completely free.

.mp2.au

Convert MP2 (.mp2) files to AU (.au) format. Transform your MP2 files to AU quickly and easily with File ConverterX — completely free.

.mpeg.au

Convert MPEG (.mpeg) files to AU (.au) format. Transform your MPEG files to AU quickly and easily with File ConverterX — completely free.

.mxf.au

Convert MXF (.mxf) files to AU (.au) format. Transform your MXF files to AU quickly and easily with File ConverterX — completely free.

.nut.au

Convert NUT (.nut) files to AU (.au) format. Transform your NUT files to AU quickly and easily with File ConverterX — completely free.

.pam.au

Convert PAM (.pam) files to AU (.au) format. Transform your PAM files to AU quickly and easily with File ConverterX — completely free.

.pbm.au

Convert PBM (.pbm) files to AU (.au) format. Transform your PBM files to AU quickly and easily with File ConverterX — completely free.

.pcx.au

Convert PCX (.pcx) files to AU (.au) format. Transform your PCX files to AU quickly and easily with File ConverterX — completely free.

.pgm.au

Convert PGM (.pgm) files to AU (.au) format. Transform your PGM files to AU quickly and easily with File ConverterX — completely free.

.ppm.au

Convert PPM (.ppm) files to AU (.au) format. Transform your PPM files to AU quickly and easily with File ConverterX — completely free.

.psd.au

Convert PSD (.psd) files to AU (.au) format. Transform your PSD files to AU quickly and easily with File ConverterX — completely free.

.rm.au

Convert RealMedia (.rm) files to AU (.au) format. Transform your RM files to AU quickly and easily with File ConverterX — completely free.

.roq.au

Convert RoQ (.roq) files to AU (.au) format. Transform your ROQ files to AU quickly and easily with File ConverterX — completely free.

.sbc.au

Convert SBC (.sbc) files to AU (.au) format. Transform your SBC files to AU quickly and easily with File ConverterX — completely free.

.sgi.au

Convert SGI (.sgi) files to AU (.au) format. Transform your SGI files to AU quickly and easily with File ConverterX — completely free.

.sox.au

Convert SoX (.sox) files to AU (.au) format. Transform your SOX files to AU quickly and easily with File ConverterX — completely free.

.stp.au

Convert STEP (.stp) files to AU (.au) format. Transform your STP files to AU quickly and easily with File ConverterX — completely free.

.swf.au

Convert SWF (.swf) files to AU (.au) format. Transform your SWF files to AU quickly and easily with File ConverterX — completely free.

.tta.au

Convert TTA (.tta) files to AU (.au) format. Transform your TTA files to AU quickly and easily with File ConverterX — completely free.

.voc.au

Convert VOC (.voc) files to AU (.au) format. Transform your VOC files to AU quickly and easily with File ConverterX — completely free.

.w64.au

Convert W64 (.w64) files to AU (.au) format. Transform your W64 files to AU quickly and easily with File ConverterX — completely free.

.wv.au

Convert WavPack (.wv) files to AU (.au) format. Transform your WV files to AU quickly and easily with File ConverterX — completely free.

.y4m.au

Convert YUV4MPEG (.y4m) files to AU (.au) format. Transform your Y4M files to AU quickly and easily with File ConverterX — completely free.

Frequently Asked Questions

Most media players like VLC, Windows Media Player, and Audacity can open AU files.

Need to convert AU files?

File ConverterX supports converting .au files to and from dozens of formats — completely free.

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