MMegaConvert

Convert AAC to AU

Free online AAC to AU converter. No signup required.

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Max file size: 100 MB

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How to Convert AAC to AU

Follow these simple steps to convert your file in seconds.

  1. 1

    Upload your .aac file

    Drag and drop your .aac 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 AAC 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 AAC and AU Formats

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

Source Format

AAC Audio

audio/aac

AAC (Advanced Audio Coding) is a lossy audio compression standard designed as the successor to MP3, offering better sound quality at equivalent bitrates. It is the default audio format for Apple devices, YouTube, and many streaming platforms. AAC supports sample rates from 8 to 96 kHz and up to 48 channels of audio.

Advantages

  • Better audio quality than MP3 at the same bitrate
  • Default format for iTunes, Apple Music, YouTube, and many streaming services
  • Supports multi-channel audio up to 48 channels

Limitations

  • Lossy compression permanently removes audio information
  • Slightly less universal hardware support compared to MP3
  • Patent-encumbered format with licensing requirements for encoders

Common Uses

  • Apple ecosystem audio including iTunes and Apple Music
  • YouTube and streaming platform audio encoding
  • Mobile audio content and digital broadcasting

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 AAC to AU.

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