AU to ATRAC3 - Online Audio Converter

Convert AU to ATRAC3 online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.

Convert AU to ATRAC3

[+] Drop AU audio here or click to select AU

Output format

ATRAC3 (ATRAC3)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

About AU to ATRAC3

Convert AU to ATRAC3. AU is Sun's simple container, usually holding 8 kHz telephony audio. The ATRAC3 target packages Sony's MiniDisc-era codec for portable players. Bitrate caps apply, so keep a master copy..

Why convert AU to ATRAC3?

Smaller files with ATRAC3 lossy compression.
Keep quality where supported.
Private, no upload - runs in your browser.

AU vs ATRAC3

Codec	PCM 16-bit	ATRAC3
Compression	uncompressed	lossy
Sample behavior	Full quality kept	Quality set by bitrate
Typical use	AU is Sun's simple container, usually holding 8 kHz telephony audio.	The ATRAC3 target packages Sony's MiniDisc-era codec for portable players.

When not to convert AU to ATRAC3

Skip ATRAC3 for archival masters: lossy compression discards detail, so keep the AU original.
Keep a master copy: repeated exports stack small losses, so archive AU before batch ATRAC3 shares.

Limits

Starting point: AU - AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion. Bitrate caps apply, so keep a master copy. Encode ATRAC3 (ATRAC3) from AU at 256k for music or 128k for speech, starting from the master.

How conversion works

Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.

Related conversions

FAQ

How do I convert AU to ATRAC3?

Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as ATRAC3 instantly. All processing runs in your browser.

What codec is used for ATRAC3?

The default codec for ATRAC3 is ATRAC3. You can change audio parameters in Advanced mode.

How do you store my files?

We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.