How do I convert AU files to FLAC online?

Upload your AU file, choose FLAC as the target format, then click Convert. LetsConvert processes the audio and preserves the original sample rate and bit depth. Download the resulting FLAC file after conversion.

Why should I convert AU to FLAC instead of keeping the original AU file?

AU is common on Sun/NeXT systems and often stores uncompressed PCM, leading to large files. FLAC compresses losslessly, reducing size by up to 60% while maintaining exact audio data. FLAC is also widely supported on modern players, phones, and OSes, whereas AU is not.

Does converting AU to FLAC preserve bitrate, sample rate, and channel count?

Yes, FLAC is lossless. If the AU file contains uncompressed PCM, the converter extracts the exact audio samples and re-encodes them without modification; bit depth, sample rate, and channels are preserved. If the AU uses a compressed codec like G.711 μ-law, the audio is first decoded to PCM and then encoded to FLAC, so the resulting sound is identical to the original after decoding, though the compressed container is discarded.

Is AU-TO-FLAC free to use?

Yes, AU-TO-FLAC on LetsConvert is 100% free with no registration or hidden fees required.

Are my uploaded files safe and secure?

Yes! File privacy and security are guaranteed. Basic conversions run locally in your browser. Files sent for server processing are automatically deleted within 1 hour.

Does this converter work on mobile phones and tablets?

Yes! AU-TO-FLAC works seamlessly across iPhone, Android, iPad, Mac, Windows, and Linux browsers without installing any app.

Is there any software installation required?

No software or browser extension installation is needed. All conversions are performed directly online.

AU➔FLAC· 100% Free & 320kbps

AU-TO-FLAC

Convert AU to FLAC for lossless compression: FLAC shrinks uncompressed AU by 40-60% while preserving PCM quality, ideal for archives and cross-platform playback.

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Choose Au audio file or drag & drop here

Supports up to 50MB · Studio quality sound

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AU

AU File Format

Source Format

AU is a standardized digital file format supported by LetsConvert. Convert AU files securely, privately, and instantly online with zero software installation, bank-grade encryption, and automatic 60-minute file purging.

Category: Data & Media File

MIME Type: application/au

Developer: Standard Organization

Best For: Converting and managing AU files across devices and applications.

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FLAC

Free Lossless Audio Codec

Target Output

FLAC is an open-source, royalty-free audio format that compresses digital audio losslessly by 50-60% without modifying or discarding a single acoustic byte. It is the premier format for audiophile music listening and digital archiving.

Category: Lossless Audio

MIME Type: audio/flac

Developer: Xiph.Org Foundation

Best For: Audiophile music collections, CD ripping, music archiving, and master track distribution.

💡 Technical Guide & Conversion Insights

Why Convert AU to FLAC?

Converting from AU (AU File Format) to FLAC (Free Lossless Audio Codec) is essential when you need enhanced compatibility, reduced file size, or specific feature support. While AU is ideal for Converting and managing AU files across devices and applications., FLAC offers superior advantages for Audiophile music collections, CD ripping, music archiving, and master track distribution.. Our secure online conversion engine ensures that all your AU file attributes, geometry, quality, and metadata are seamlessly preserved during the transformation into FLAC.

● AU Key Advantages:

✓Standard format compatibility
✓Fast online conversion processing
✓Zero software install required

● FLAC Key Advantages:

★100% bit-for-bit identical to original studio master recordings
★Reduces file sizes by ~50% compared to raw WAV
★Wide open-source support

AU vs FLAC Comparison Table

Detailed technical differences and capabilities between AU File Format and Free Lossless Audio Codec.

Feature / Attribute	AU	FLAC
Primary Format Name	AU File Format	Free Lossless Audio Codec
Primary File Category	Data & Media File	Lossless Audio
Standard MIME Type	application/au	audio/flac
Core Developer / Standard	Standard Organization	Xiph.Org Foundation
Optimal Use Case	Converting and managing AU files across devices and applications.	Audiophile music collections, CD ripping, music archiving, and master track distribution.

❓ Common Questions

Frequently Asked Questions (AU to FLAC)

Everything you need to know about converting AU to FLAC with LetsConvert.

To convert your AU file to FLAC, upload your file by dragging and dropping it into the upload box or selecting it from your device. Adjust any optional quality or dimension settings, then click 'Convert'. Your converted FLAC file will be ready for instant high-speed download within seconds.

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100% Secure & Automatic File Purging

Your AU files are encrypted with 256-bit SSL and permanently deleted from our servers within 60 minutes.

● Zero File Storage

How to Convert AU-TO-FLAC

Select or drop your Au file.

Initiate the FLAC conversion process.

Download your converted FLAC file.

⚡ Related Audio Tools

AU-TO-FLAC

AU

FLAC

Why Convert AU to FLAC?

● AU Key Advantages:

● FLAC Key Advantages:

AU vs FLAC Comparison Table

Frequently Asked Questions (AU to FLAC)

100% Secure & Automatic File Purging

How to Convert AU-TO-FLAC

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