filoshi.com / formats / mp3-to-au

Convert MP3 to AU

The MP3 format is commonly used by specialized software. By converting it to AU, you reduce file size and increase compatibility. Filoshi runs this conversion completely offline.

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How to convert MP3 to AU for free

  1. 1
    Drop your MP3 file
    Drag it onto the converter above, or click Browse Files to select it from your computer.
  2. 2
    Click Convert
    AU is auto-selected. Hit Convert - FFmpeg.wasm processes everything locally in your browser.
  3. 3
    Download your file
    Your converted AU file downloads instantly. Nothing was uploaded to a server.
Source Format

What is MP3?

MPEG Audio Layer III (.mp3) - MP3 is the most popular audio format ever created. It uses lossy compression to reduce file sizes while keeping audio quality acceptable for most listeners.

Common use: Music playback, podcasts, audiobooks, general audio sharing

Output Format

What is AU?

AU (.au) - AU is a file format that can be converted to other formats using Filoshi. The conversion runs entirely on your machine with no uploads required.

Common use: Specialized software and workflows

Frequently Asked Questions

Is converting MP3 to AU free?+
Yes! You can convert MP3 to AU for free right in your browser using Filoshi's online converter. No signup or software download needed. For batch conversion of multiple files, the Filoshi desktop app is available for a one-time $14.90 payment.
Does converting MP3 to AU lose quality?+
It depends on the formats involved. If both MP3 and AU use lossless compression, no quality is lost. If the conversion involves a lossy format, some quality reduction may occur, but Filoshi uses optimized settings to keep quality loss minimal. The conversion runs entirely on your machine, so there are no server-side compression artifacts.
Can I convert MP3 to AU without uploading my file?+
Absolutely. Filoshi processes everything locally on your computer. Your MP3 files are never uploaded to any server. Even the free browser converter runs entirely in your browser using WebAssembly, with no server involved.
How long does it take to convert MP3 to AU?+
Most conversions complete in seconds. Larger files (like high-resolution video) may take a bit longer depending on your computer's hardware. Since Filoshi runs locally, there is no upload or download wait time, which is significantly faster than online converters.
Can I batch convert multiple MP3 files to AU?+
Yes, the Filoshi desktop app supports batch conversion. You can drop an entire folder of MP3 files, select AU as the output format, and convert them all at once. Each file gets its own progress bar.

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Convert to AU

Need batch MP3 to AU conversion?
The web converter handles 1 file at a time. Filoshi desktop converts unlimited files, runs offline, and supports 3,000+ formats.
Get Filoshi Desktop - $14.90