Free online AIF to AU converter

AIF is an audio file format commonly used for uncompressed sound data, especially on classic Mac systems. AU is a Sun/NeXT audio format that also stores sound data, often in a simple container with support for several encoding types. Converting AIF to AU changes the audio container and may also involve re-encoding the sound to match AU-compatible settings.

Why convert aif to au

You may need this conversion for legacy software, older Unix systems, or applications that specifically expect .au audio files. AU can be useful when compatibility matters more than advanced metadata or modern features.

Best software for aif to au conversion

The most reliable choice is Audacity, because it supports both formats and gives you control over export settings. For command-line conversion, FFmpeg is often the best option due to its speed, automation support, and broad format compatibility.

In Audacity, open the AIF file and use File → Export → Export Audio, then choose AU as the output format if available. In FFmpeg, you can convert directly with a command such as ffmpeg -i input.aif output.au.

How the conversion works

During conversion, the audio may remain unchanged if the source encoding is compatible with AU. If not, the converter may change the sample format, bit depth, or compression to produce a valid AU file. For best results, keep the sample rate and channels consistent with the target system’s requirements.

Things to check before converting

• Audio quality: confirm whether the AU target should be uncompressed or compressed.
• Sample rate: match the destination system if it has strict requirements.
• Channels: mono or stereo support may matter for older tools.
• Compatibility: verify that the receiving application accepts the chosen AU encoding.

Recommended workflow

1. Open the AIF file in Audacity or load it with FFmpeg.
2. Choose AU as the output format.
3. Adjust encoding settings if needed.
4. Export the file and test it in the target application.

Summary

AIF to AU conversion is straightforward when you use a capable converter such as Audacity or FFmpeg. If you need a simple graphical workflow, Audacity is the easiest choice. If you want fast batch conversion or scripting, FFmpeg is usually the best software.