Free online MP2 to AU converter

MP2 is an audio compression format from the MPEG family, commonly used for broadcast and older digital audio storage. AU is a simple audio file format originally used on Sun systems, often associated with uncompressed or lightly compressed audio data. Converting MP2 to AU changes the container and may also affect audio encoding, depending on the chosen settings.

Why convert mp2 to au

You may need this conversion for compatibility with legacy Unix or Sun audio tools, archival workflows, or software that accepts AU files more readily than MP2. In some cases, AU is preferred because it is widely recognized by older systems and simple audio players.

Best software for mp2 to au conversion

The most reliable option is FFmpeg, a powerful free converter that supports both formats and gives precise control over audio encoding. For a graphical interface, Audacity can also help, though export options may depend on installed codecs and project settings.

How to convert mp2 to au with ffmpeg

Use a command like this:

ffmpeg -i input.mp2 output.au

If you need a specific audio codec for AU output, you can choose one supported by the format, such as PCM or μ-law, depending on your compatibility needs.

How to convert mp2 to au with audacity

Open the MP2 file in Audacity, then choose File → Export → Export Audio and select AU as the output format if available. This is useful when you want to inspect or edit the audio before saving.

Important conversion notes

• MP2 is compressed, while AU may use different audio encodings.
• Quality cannot improve during conversion; it can only stay the same or decrease.
• If the target AU encoder uses uncompressed PCM, the file size may become much larger.
• Check sample rate and channel settings for compatibility with your playback device.

Recommended settings

For broad compatibility, keep the original sample rate when possible and use a standard channel layout such as mono or stereo. If your target system requires a specific AU encoding, verify that the converter supports it before starting.

Summary

FFmpeg is the best overall choice for MP2 to AU conversion because it is fast, free, and highly compatible. If you prefer a visual workflow, Audacity is a practical alternative for manual conversion and audio checking.