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Free and unlimited use:

Our service is entirely free and without limits. Use it anytime, anywhere, for as many conversions as you need, without any restrictions.

Audio Size Preview:

Our audio size preview feature provides an estimate of the file size after conversion, regardless of the format. This tool helps users gauge whether the new file size meets their needs and storage capabilities, making it easier to decide on the conversion parameters for formats ranging from compressed to uncompressed audio.

Custom Quality:

Our conversion tool offers customizable options for audio bitrate and sample rate, allowing users to fine-tune the quality of their audio files. Whether you're converting to a format for professional use or casual listening, these settings provide the flexibility to optimize audio quality according to your specific requirements.

Fast conversion:

We value your time. Our service efficiently converts your AAC files to high-quality AU format, allowing for quick access to your uncompressed audio files.

Cross-Platform Accessibility: is accessible on any device with an internet connection. Convert AAC to AU effortlessly on your desktop, tablet, or smartphone, anytime and anywhere.

Privacy Protection:

Your privacy is our top concern. We ensure that your files are never stored on our servers, maintaining the security and confidentiality of your data.

Local Conversion:

Enhance your security by converting AAC to AU directly on your device. Our local conversion process prevents your audio files from being uploaded to our servers, protecting the confidentiality of your files, especially important for sensitive or personal data.

Audio parameters

Audio Bitrate:

Audio bitrate is a key determinant of audio quality and file size, measured in kilobits per second (kbps). Common bitrate values range from 128 kbps, suitable for standard quality, to 320 kbps for high-quality audio. In professional settings, bitrates can be even higher. Our tool allows you to choose from a variety of bitrate options, enabling you to strike the perfect balance between sound quality and file size based on your specific needs, whether it's for casual listening or high-fidelity audio playback.

Sample Rate:

The sample rate, measured in hertz (Hz), defines how many times the audio is sampled per second. Standard CD-quality audio uses a sample rate of 44.1 kHz, while professional audio recordings often use 48 kHz or higher, up to 192 kHz for high-resolution audio. Our conversion tool lets you adjust the sample rate to suit your requirements, offering the flexibility to choose between standard quality for everyday use and higher rates for detailed, professional-grade audio production.

Introduction to AU Format

Definition of AU

AU is an audio file format primarily used on Sun Microsystems and UNIX-based computers. Known for its simple audio data structure, AU is often used for straightforward audio data storage. It's recognized for its compatibility with various UNIX applications, making it a standard format in these environments.

Simple and Effective Audio Format

The AU format is valued for its simplicity. It's designed to store sound in a compact, yet effective format, making it suitable for applications where complex audio file structures are not necessary. This simplicity ensures easy handling and playback on compatible systems.

Compatibility with UNIX Systems

AU's high compatibility with UNIX and UNIX-like operating systems makes it a common choice for audio in these environments. Its straightforward structure and compatibility features are well-suited for various UNIX applications.

Introduction to AAC Format

Definition of AAC

AAC, short for Advanced Audio Coding, is a lossy digital audio compression format. It offers superior audio quality compared to MP3 at similar bit rates and is widely used in digital platforms and streaming services due to its efficiency and quality.

Efficient Compression and High-Quality Audio

AAC is known for its efficient compression and ability to deliver high-quality audio. This balance of quality and compression makes it suitable for a wide range of digital audio applications, including broadcasting and streaming services.

Broad Compatibility Across Devices

With widespread support across various digital devices and platforms, AAC is a versatile format for audio playback and distribution in diverse digital environments.

What Happens When Converting AAC to AU

Conversion to a Simpler Audio Format

Converting from AAC to AU involves transforming the more complex, compressed AAC file into the simpler AU format. This process may lead to changes in audio quality and file size, as the AU format typically does not support the same level of compression as AAC.

Potential Increase in File Size

Since AU is often a less compressed format, converting from AAC may result in an increase in file size. This should be considered if storage space is a concern.

Adaptation for UNIX Compatibility

The conversion enhances the file's compatibility with UNIX-based systems, making it more suitable for use in these environments where simplicity and compatibility are key.

Considerations When Converting AAC to AU

Evaluating Compatibility Needs

Before converting to AU, consider the compatibility requirements of the target system or application. While AU is well-suited for UNIX systems, it may not be the best choice for others.

Understanding Quality and Size Trade-offs

Be aware of potential changes in audio quality and file size when converting from AAC to AU. The original compressed quality of AAC might not be fully retained in the AU format, leading to a difference in audio experience.

Selecting Appropriate Conversion Software

Choosing the right software for converting AAC to AU is crucial. Opt for a tool that can effectively handle the conversion process without compromising the integrity of the audio data.

Security in Conversion

For audio files with sensitive content, opt for a service that upholds privacy. performs AAC to AU conversions directly on your local device, ensuring absolute confidentiality and security of your files. This local conversion method safeguards your data from being uploaded to external servers and provides protection throughout the conversion process.

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