SWF to AU Converter

Extract Sun/NeXT AU audio from Flash SWF content

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Flash to Unix Audio

Extract audio from SWF Flash files and wrap it in the AU format — native to Sun/Unix systems and Java applications.

Unix Compatibility

AU is the standard audio format on Unix platforms. Your converted SWF audio integrates seamlessly with Unix audio tools.

Online Conversion

No Unix tools or Flash software needed locally. Our servers decode the SWF and produce the AU file for you.

How to convert SWF 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

SWF (Small Web Format, originally Shockwave Flash) is a file format for multimedia, vector graphics, and interactive content created by Macromedia in 1996 and later developed by Adobe Systems following the acquisition of Macromedia in 2005. SWF files contain a combination of vector and raster graphics, animations, embedded audio and video, and ActionScript code for interactivity, all packaged in a compact binary format designed for efficient web delivery. During its heyday from the late 1990s through the early 2010s, SWF powered a vast ecosystem of web content including animated websites, banner advertisements, casual games, educational applications, and interactive multimedia experiences. The vector-based rendering engine allowed smooth animations and scalable graphics at remarkably small file sizes, making rich multimedia content practical even on slow internet connections. SWF supported progressive rendering, allowing content to begin playing before the entire file was downloaded. Adobe Flash Player at its peak was installed on over 98% of internet-connected desktop computers, giving SWF an unmatched reach for interactive web content. The format evolved to support video playback, camera and microphone access, 3D acceleration, and socket connections for real-time applications. Adobe ended Flash Player support in December 2020, but SWF files remain historically significant and are preserved through open-source projects like Ruffle that enable continued access to this era of web content.
Initial release: 1996
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 SWF to AU?

AU is the standard audio format for Sun and Unix systems. It is also used in Java applications and early web audio embedding.

How do I play AU files?

VLC, Audacity, and native Unix/Linux audio players handle AU files. Java-based applications often use AU for sound playback.

Is AU widely supported?

AU has broad support on Unix-like systems and in Java environments. For general cross-platform use, WAV or MP3 are more common.

What encoding does AU use?

AU supports several encodings including mu-law, A-law, and linear PCM. The default mu-law is efficient for voice content.

Is Flash Player needed?

No. Everything is processed on our servers. You upload the SWF and receive the AU file through your browser.