WAV to AU Converter

Reformat WAV audio as Sun/NeXT AU format online

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Unix Audio Standard

Convert WAV to AU for seamless audio integration on Unix, Solaris, and Java-based platforms.

Cross-Platform Bridge

Bridge the gap between Windows WAV and Unix AU — both store PCM audio, just in different containers.

Cloud Conversion

The WAV to AU reformatting runs entirely on our servers — no Unix tools needed on your Windows or Mac machine.

How to convert WAV to AU

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose au or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your au file right afterwards

About formats

WAV (Waveform Audio File Format) is an uncompressed audio container jointly developed by Microsoft and IBM, first published in August 1991 alongside Windows 3.1. Built on the Resource Interchange File Format (RIFF), WAV stores audio data — most commonly as linear pulse-code modulation (LPCM) — together with metadata describing sample rate, bit depth, and channel count. This straightforward structure has made WAV the de facto standard for uncompressed audio on Windows and a universally accepted interchange format across virtually every operating system, audio editor, and media player in existence. CD-quality WAV files use 16-bit samples at 44.1 kHz stereo, while professional workflows routinely employ 24-bit or 32-bit float samples at rates up to 192 kHz. A major advantage is zero-loss fidelity: because standard WAV applies no compression, the stored data is an exact digital representation of the original recording, making it the preferred choice for mastering and archiving. WAV also supports embedded metadata through INFO and BWF chunks, enabling timestamping and production notes. The main trade-off is file size — one minute of CD-quality stereo occupies roughly 10 MB — and the 32-bit RIFF structure imposes a 4 GB limit, though RF64 removes that ceiling.
Developer: Microsoft and IBM
Initial release: August 1991
AU is an audio file format introduced by Sun Microsystems for its Unix workstations and the NeXT platform. It features a minimal 24-byte header specifying data offset, size, encoding type, sample rate, and channel count, followed by the audio payload. AU supports numerous encodings, including uncompressed linear PCM at various bit depths, mu-law and A-law companding (logarithmic compression used in telephone systems), and several ADPCM variants. This versatility made AU a workhorse across early Unix environments, web audio (Java applets defaulted to AU), and telephony applications. One advantage is simplicity: the compact header and straightforward structure make it trivial to parse, generate, and stream programmatically. The built-in mu-law option provides another benefit, delivering reasonable voice quality at just 8 KB per second — half the rate of 16-bit uncompressed audio — invaluable when storage and bandwidth were scarce. Although modern formats have largely supplanted AU in consumer applications, it retains a foothold in scientific computing and audio processing pipelines where minimal overhead and reliable cross-platform behavior are valued.
Developer: Sun Microsystems
Initial release: 1992

Frequently Asked Questions

Why convert WAV to AU?

AU is the native audio format on Unix and Solaris. Java applications use AU for multimedia, and legacy Unix systems often expect audio in this format.

What opens AU files?

SoX, Audacity, VLC, and native audio tools on Unix/Linux systems play AU. Java multimedia APIs read AU natively.

Is AU compressed?

AU can store both uncompressed PCM and mu-law compressed audio. The choice depends on your target platform requirements.

How does AU differ from WAV?

Both can hold PCM audio. AU originates from Sun/NeXT and uses big-endian byte order. WAV is from Microsoft and uses little-endian.

Can I convert multiple WAV files?

Upload a batch of WAV files and produce AU versions for each in a single session — efficient for Unix system audio deployment.

WAV to AU Quality Rating

4.8 (231 votes)
You need to convert and download at least 1 file to provide feedback!