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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 FLAC 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 FLAC 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 FLAC 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 a straightforward audio file format primarily used on Sun Microsystems and UNIX-based computers. Known for its basic audio data structure, the AU format is often utilized for simple audio data storage and is recognized for its compatibility with various UNIX applications.

Simple and Effective Audio Format

The AU format's simplicity is one of its key advantages. It is designed to store sound in a compact yet effective way, making it suitable for applications where complex audio file structures are unnecessary. This simplicity ensures easy handling and playback on compatible UNIX systems.

Compatibility with UNIX Systems

AU is highly compatible with UNIX and UNIX-like operating systems, making it a frequent choice for audio in these environments. Its straightforward structure is well-suited for a variety of UNIX applications.

Introduction to FLAC Format

Definition of FLAC

FLAC, which stands for Free Lossless Audio Codec, is a format known for lossless audio compression. Unlike many other audio formats, FLAC compresses without any loss of quality, providing an exact digital copy of the original audio. It is a preferred format for audiophiles and in applications where audio quality is paramount.

Lossless Quality and Efficient Compression

FLAC's lossless compression ensures the highest audio fidelity, offering high-quality audio storage in a more compact form than uncompressed formats. This makes it ideal for both high-quality audio storage and for users who value the integrity of their audio content.

Compatibility with High-Fidelity Audio Systems

FLAC is supported by a wide range of high-fidelity audio systems and software players, making it a popular choice among users who demand the highest audio fidelity.

What Happens When Converting FLAC to AU

Conversion to a Simpler Audio Format

Converting from FLAC to AU involves transforming the lossless, high-quality FLAC file into the simpler AU format. This process may result in changes in audio quality and file size, as the AU format typically does not support the same level of audio fidelity as FLAC.

Potential Increase in File Size

Since AU is often less compressed than FLAC, converting to AU may lead to an increase in file size, which is an important consideration if storage space is limited.

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.

Considerations When Converting FLAC 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 other environments.

Understanding Quality and Size Trade-offs

Be aware of potential changes in audio quality and file size when converting from FLAC to AU. The original lossless quality of FLAC 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 FLAC to AU is crucial. Opt for a tool that can effectively handle the conversion process without compromising the integrity of the audio data, especially considering the differences in audio quality and file size.

Security in Conversion

For audio files with sensitive content, opt for a service that upholds privacy. performs FLAC 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.

reviewer: best.tool