AU to FLAC - Online Audio Converter

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

Convert AU to FLAC

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

Output format

FLAC (FLAC)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

About AU to FLAC

Convert AU to FLAC. AU is Sun's simple container, usually holding 8 kHz telephony audio. FLAC halves WAV sizes bit-for-bit with open hardware support. Apple players prefer ALAC; convert for iPhone libraries..

Why convert AU to FLAC?

Larger files than lossy shares with FLAC lossless quality.
Keep quality where supported.
Private, no upload - runs in your browser.

AU vs FLAC

Codec	PCM 16-bit	FLAC
Compression	uncompressed	lossless
Sample behavior	Full quality kept	Full quality kept
Typical use	AU is Sun's simple container, usually holding 8 kHz telephony audio.	FLAC halves WAV sizes bit-for-bit with open hardware support.

When not to convert AU to FLAC

Skip FLAC for the smallest share: lossless output stays large, so prefer a lossy target when sending AU files.
Keep a master copy: repeated exports stack small losses, so archive AU before batch FLAC 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. Apple players prefer ALAC; convert for iPhone libraries. Encode FLAC (FLAC) 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.

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FAQ

How do I convert AU to FLAC?

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

What codec is used for FLAC?

The default codec for FLAC is FLAC. 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.