AU to FAP Converter

High-quality AU to FAP conversion online

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Universal Access

Whether you are on a PC, Mac, Chromebook, or smartphone, the AU to FAP converter works directly in your browser.

Fast Results

The AU to FAP conversion engine is optimized for speed. Most audio files are processed and ready to download within seconds.

Intuitive Process

The AU to FAP converter is designed for simplicity. Upload, convert, download — done in under a minute.

How to convert AU to FAP

1

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

2

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

3

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

About formats

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
FAP is a byte-swapped variant of the PAF (Paris Audio File) format associated with the Ensoniq PARIS digital audio workstation, a recording environment popular among project-studio engineers in the late 1990s. Where standard PAF stores sample data in big-endian order, FAP reverses the byte layout for little-endian architectures, enabling direct memory mapping on Intel-based processors without a runtime byte-swap penalty. The underlying payload is uncompressed linear PCM at up to 24-bit depth and 96 kHz sampling, preserving full studio-grade fidelity. Because there is no lossy coding stage, recordings survive unlimited edit cycles with zero generational loss — a critical property during tracking and mixing. The SoX command-line utility maintains read/write support for FAP, making it the most accessible tool for converting legacy PARIS sessions to modern formats. Despite its niche origins, FAP demonstrates solid engineering: the header is minimal and deterministic, eliminating ambiguity that sometimes plagues chunk-based containers. Advantages include bit-perfect audio preservation, fast I/O on x86 hardware due to native byte order, and straightforward interoperability with raw PCM tools.
Developer: Ensoniq
Initial release: 1998

Frequently Asked Questions

Why convert AU to FAP?

AU is a legacy UNIX format with limited software support today. Converting to FAP ensures broader playback compatibility.

Which software plays FAP?

Open FAP with Ensoniq PARIS, SoX, specialized DAW tools. These applications provide full playback and editing support for the format.

Is the AU to FAP conversion lossless?

That depends on the FAP codec. Lossless formats keep every sample intact, while lossy ones reduce data for smaller output sizes.

How many AU files can I convert in one go?

Upload as many AU files as you need and convert them to FAP simultaneously. The batch feature handles multiple files efficiently.

What happens to my files after conversion?

Your original AU is deleted as soon as conversion ends. The resulting FAP is available for download and automatically removed within 24 hours.