MP3 .mp3
A widely supported lossy audio format. Higher bitrates generally preserve more sound detail.
MP3 file format guideMP3 to AU converter
Convert MP3 (.mp3) to AU for free. Choose files, review the available settings and download your results. No account needed.
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Sun AU .au
A simple audio container associated with Sun and Unix systems. An AU header describes the sound encoding, sample rate, and channel count.
Tested output uses signed 16-bit big-endian PCM; AU also has encodings with different playback requirements.
AU file format guideHow to convert MP3 to AU
- Select MP3 files from your device or drag them into the converter.
- Check the AU output. Open conversion settings if you want to make adjustments.
- Convert, compare the original and result, then download your files.
Quality, compatibility and file limits
Choose the sample rate, trim range, and mono or stereo output. Compressed audio formats can discard detail; converting to a lossless format cannot restore sound already lost. Container support depends on the codec inside the file.
Processing uses your device when possible and our servers when required. Browser files are limited to 256 MB each; server conversions to 64 MB; browser spreadsheets to 32 MB. Previews show supported content and do not guarantee identical rendering in every application.