MMegaConvert

Convert OPUS to AU

Free online OPUS to AU converter. No signup required.

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Max file size: 100 MB

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How to Convert OPUS to AU

Follow these simple steps to convert your file in seconds.

  1. 1

    Upload your .opus file

    Drag and drop your .opus file into the upload area, or click "Browse" to select it from your device. Your file is uploaded securely and processed on our servers.

  2. 2

    Click "Convert to AU"

    Once your file is uploaded, press the convert button to start the OPUS to AU conversion process.

  3. 3

    Wait for the conversion to complete

    The conversion usually takes just a few seconds. You can see the progress in real time while your file is being processed.

  4. 4

    Download your converted .au file

    When the conversion is finished, click the download button to save your new .au file. The file is ready to use immediately.

Understanding OPUS and AU Formats

Learn about the source and target file formats to understand what happens during conversion.

Source Format

Opus Audio

audio/opus

Opus is a highly versatile, open-source lossy audio codec standardized by the IETF, excelling at both voice and music encoding. It dynamically adapts between low-latency speech coding and high-quality music encoding within a single stream, and consistently outperforms MP3, AAC, and Vorbis in quality comparisons. Opus supports bitrates from 6 kbps to 510 kbps and is designed for real-time interactive audio.

Advantages

  • Superior audio quality compared to all other lossy codecs at any bitrate
  • Extremely low latency (as low as 5 ms) ideal for real-time communication
  • Completely open-source, royalty-free, and standardized by the IETF

Limitations

  • Limited support in older hardware devices and car stereos
  • Relatively newer format with smaller existing content libraries
  • Not yet widely adopted for music distribution despite technical superiority

Common Uses

  • Voice over IP (VoIP) and video conferencing applications
  • WebRTC real-time audio in web browsers
  • Streaming audio where bandwidth efficiency is critical

Target Format

Sun AU Audio

audio/basic

AU is an audio file format introduced by Sun Microsystems and commonly associated with Unix and NeXT systems. It supports various encodings including uncompressed PCM, mu-law, and A-law compression, with a simple header structure. AU was one of the earliest audio formats supported on the web and remains used in Unix-based audio programming.

Advantages

  • Simple, well-documented format with a minimal header
  • Native support in Unix, Solaris, and Java audio APIs
  • Supports multiple encoding types including mu-law for telephony

Limitations

  • Largely obsolete for general-purpose audio use
  • Limited metadata support and no modern compression options
  • Poor support in consumer audio software and devices

Common Uses

  • Unix and Solaris system audio and sound effects
  • Java application audio playback (javax.sound)
  • Legacy telephony and voice processing systems

Frequently Asked Questions

Common questions about converting OPUS to AU.

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