Convert anything, at global scale.

200+ formats and automation APIs that feels instant.

CONVERT

From

Drop files or choose a source

Upload multiple files at once, mix formats, and fine-tune every conversion with format-aware settings.

Max 2GB per file · Drag & drop ready · Mixed file types welcome

AUDIO

MP3 to AU Converter — Free, Online, No Signup

Convert MP3 files to AU online with no signup required.

Reverse conversion

MP3 at a glance

MP3

—

AU at a glance

—

Format comparison

Feature	MP3	AU
File type	Audio	Audio
Status	active	active
Primary use cases	capture ingest editing and mastering streaming or playback delivery	capture ingest editing and mastering streaming or playback delivery
Multitrack support	Not supported	Not supported
HDR support	Not supported	Not supported
Streaming ready	Supported	Not supported

When to use each format

When to use MP3

Your source file is already in MP3.
Preserve source expectations before exporting to AU.
MP3 is commonly used in audio workflows.

When to use AU

Your target workflow expects AU.
Improve delivery compatibility with AU.
AU is commonly used in audio workflows.

FAQs

Why convert MP3 to AU?

This conversion is usually chosen when AU fits downstream audio delivery better.

What changes when converting MP3 to AU?

This conversion changes how the format behaves in downstream tools and delivery environments.

Moving to AU removes streaming delivery.

What should I review after converting MP3 to AU?

Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.

Format resources

MP3 AU