Compress AU File Size

Reduce AU Below Specific Size

By Percentage
MB
%

Compression instructions below

How do I reduce AU file size?

You can reduce au file size by setting a specific desired output file size or reduce by percentage.

  1. To reduce AU below a certain size, enter your desired file size in MB. E.g. 5 MB or 0.5 for 500KB and click "Next".
    Reduce au Below Specific Size
  2. To reduce AU by percentage, click the "By Percentage" tab and enter your desired percentage reduction. E.g. 30 for 30% file size reduction and click "Next".
    Reduce au By Percentage

You will be redirect to the correct file compression page. The page contains further instructions for reducing AU file size.

More how-to guides

Enter the size you need in megabytes and ezyZip compresses the AU file to fit under it. Common targets are 5MB, 10MB, 16MB, 20MB, 25MB and 100MB, and any other value works just as well. Choose one from the list below, or type your own into the size box at the top of this page. Files are processed inside your browser, so nothing is uploaded.

Choose how much smaller you want the file to be. Reducing by 50% halves it, and reducing by 80% leaves a fifth of the original size. ezyZip works out the target for you and compresses the AU file to match. Choose a percentage from the list below, or type your own into the box at the top of this page.

Frequently asked questions

At ezyZip, we offer an advanced compression feature that allows you to reduce the size of your AU files either by setting a specific target file size or by selecting a percentage reduction. This functionality is perfect for tailoring AU files to meet various requirements or limitations. Whether you need to comply with size constraints for uploads and emails, or simply want to save disk space, you can easily customize the compression to fit your needs.
Yes, reducing the size of an audio file will likely impact the audio quality. AU format uses a audio compression algorithm that discards certain parts of the audio data to decrease file size—a process known as "lossy" compression. When you further reduce the audio bitrate, the compression becomes more aggressive, which means more audio information is removed. This generally results in a decrease in sound quality, characterized by a reduction in clarity, depth, and fidelity. The extent of quality loss depends on your desired output file size and the specific compression settings used during the conversion process.

The ezyZip audio compressor will select optimal audio bitrate and codec to ensure it closely matches original quality.

Once the compression process is complete, ezyZip offers a feature to "preview" the audio file before saving to see if it meets your quality requirements.
ezyZip is an online tool that makes reducing au audio files quick and easy. Whether you're optimizing audio file size for sharing, saving storage space, or faster uploads, ezyZip compresses audio files directly in your browser—no downloads and no installations with minimal loss of quality. Many other audio formats are also supported!

ezyZip processes files directly in your browser. Unlike most online tools, your files are not uploaded to our servers, which means faster processing and better privacy. Take a look at the feature comparison below and we think youll agree that ezyZip is the better choice for your file conversion needs.

Feature ezyZip Other Online Tools
No Software Installation Works Directly in Browser Works Directly in Browser
Processing Location Your Browser (No Upload) Their Servers (Upload Required)
Privacy & Security 100% Private (Files Never Leave Your Device) Files Uploaded, Accessible by Others
Processing Speed Fast (No Upload/Download Time) Slow (Upload + Process + Download)
Registration Required Never Often Required for Large Files
Works Offline Yes (After Page Load) No
Media Format Support 200+ Audio/Video Formats Limited (MP4, MP3 only)
Output Quality Clean Output, No Watermarks Watermarks Added
File Size & Usage Limits 1GB Files, Unlimited Usage 100-200MB, Daily Limits
Cost 100% Free Free with Limitations / Paid Tiers
Established Since 2009 (15+ Years) Recent (May Disappear)

Why client-side AU media compression keeps your content private

ezyZip compresses AU media using a full WebAssembly-compiled codec library running locally in your browser. Here is why local media compression is technically superior:

  • Local Codec ExecutionCompiled codec libraries run locally on your CPU, delivering the same encoding quality as desktop transcoding software. The WASM build includes optimized codec implementations that produce professional-grade output.
  • Multiple Compression StrategiesChoose between target file size, percentage reduction, or resolution scaling — each mode uses a different optimization strategy tailored to that compression goal, with adaptive algorithms that adjust parameters for your specific content.
  • Dual-Mode CompatibilityMulti-threaded primary execution via SharedArrayBuffer with automatic single-threaded fallback ensures consistent performance across all modern browsers. The engine detects your browser's capabilities and selects the optimal execution mode automatically.
  • No Restrictions or WatermarksThere are no file size limits, no watermarks stamped on output, no daily processing caps, and no queue wait times. You get unrestricted access to the full codec library with no artificial limitations.