AU to SMP Converter

Free online tool for AU to SMP conversion

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Rapid Conversion

Our servers convert AU to SMP quickly, even for longer recordings. Download your result as soon as processing finishes.

Browser-Based Tool

No software to install — convert AU to SMP directly in Chrome, Firefox, Safari, or Edge. Open the page and start converting.

Online Processing

Our cloud infrastructure handles AU to SMP conversion so your device resources stay completely untouched.

How to convert AU to SMP

1

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

2

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

3

Let the file convert and you can download your smp 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
SMP is the native file format of SampleVision, a sample editing application developed by Turtle Beach Systems around 1990. SampleVision was among the first PC-based visual sample editors, letting musicians view waveforms on screen and perform cut, copy, paste, and loop-point editing — capabilities previously limited to expensive dedicated hardware samplers. The SMP format stores 16-bit mono PCM audio along with sampling-specific metadata: loop start and end points, sustain loops, release loops, and MIDI root note assignments. This made SMP files directly useful for creating and exchanging patches between hardware samplers via MIDI Sample Dump Standard (SDS) transfers, which SampleVision automated through its interface. A primary advantage was bridging the PC world with professional sampling hardware from Akai, E-mu, Ensoniq, and Roland — devices that had tiny screens and minimal editing tools. The format also supported common sample rates (22050, 44100 Hz) and brief text descriptions alongside audio data. Though Turtle Beach pivoted to gaming peripherals and SampleVision was discontinued, SMP files persist in vintage sample library archives and can be converted using SoX.
Initial release: 1990

Frequently Asked Questions

Why convert AU to SMP?

Since AU is a dated Sun Microsystems format, moving to SMP brings your audio into a modern, widely recognized container.

What programs can open SMP?

SMP can be opened with SampleVision, SoX, legacy sampler editors. Most modern audio applications handle this format without issues.

Does converting AU to SMP affect quality?

Lossless-to-lossless conversions preserve all audio data. When the target uses lossy compression, some quality reduction is inherent in the codec.

How many AU files can I convert in one go?

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

Is the AU to SMP conversion secure?

Completely. Your AU files are erased immediately after processing, and converted SMP results are purged from our servers within 24 hours.