FLAC
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AU

Convert FLAC to AU Online

Convert FLAC to AU online. Start with free daily conversions, no install, no watermarks, and visible job status.

FLAC to AU Converter

Upload your FLAC file to convert it to AU format

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How to Convert FLAC to AU

Follow these simple steps

1

Step 1: Upload Your File

Upload your FLAC file by dragging and dropping or clicking to browse

2

Step 2: Select Output Format

AU is automatically selected as the output format

3

Step 3: Start Conversion

Click the Convert button to start the conversion

4

Step 4: Download Result

Download your converted AU file when ready

Convert FLAC to AU - Complete Guide

Converting FLAC to AU stays in the audio file family but changes the traits that decide size, quality, transparency, editability, or device support. FLAC is a lossless audio format used for high-quality music archives without the large size of raw audio. AU is a audio format. Sun audio. Below is what actually changes in a FLAC→AU conversion, what is preserved, and when AU is the better choice than keeping FLAC.

What changes when you convert FLAC to AU

  • The audio is re-encoded into the AU format. Because re-encoding is not free, start from the highest-quality source you have and keep quality settings high.

About the FLAC format

FLAC (Free Lossless Audio Codec) offers CD-quality audio with file compression. It preserves every bit of audio data while reducing file sizes by 50-60% compared to WAV.

  • Full name: Free Lossless Audio Codec
  • Developer: Xiph.Org Foundation
  • Compression: Lossless compression
  • Opens with: VLC, foobar2000, most modern players

Where FLAC is strong: lossless quality at roughly half the size of WAV; supports rich metadata and cover art; ideal for archiving music.

Typical FLAC uses: hi-fi music archives, lossless backups of CDs, audiophile playback.

About the AU format

AU is a audio format. Sun audio.

  • Compression: mixed
  • Opens with: VLC, Audacity, FFmpeg

Where AU is strong: simple legacy format from Sun/NeXT systems; stores uncompressed PCM or companded mu-law/A-law audio; easy to read and parse.

Typical AU uses: legacy Unix and Java system sounds, older audio archives.

What AU keeps

  • AU adds: simple legacy format from Sun/NeXT systems.

Things to watch out for

  • AU is less universally supported than FLAC — make sure your target player or platform accepts AU before converting.
  • One AU limitation to keep in mind: dated format rarely used today.

When to convert FLAC to AU

  • Convert FLAC to AU for legacy Unix and Java system sounds.
  • Convert FLAC to AU for older audio archives.
  • Pick AU when you need stores uncompressed PCM or companded mu-law/A-law audio.

FLAC vs AU — format comparison

A quick side-by-side of the structural differences between FLAC and AU, so you can confirm this is the right conversion for your file:

AttributeFLACAU
TypeAudio fileAudio file
CompressionLosslessFlexible (lossy or lossless)
Web-friendlyYesNo
Typical file sizeMediumMedium
Best forhi-fi music archiveslegacy Unix and Java system sounds

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Need the opposite conversion?

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Other FLAC Conversions

More formats you can convert FLAC to

Convert FLAC to MP3Convert FLAC to WAVConvert FLAC to AACConvert FLAC to OGGConvert FLAC to M4AConvert FLAC to WMAConvert FLAC to AIFFConvert FLAC to OPUSConvert FLAC to AC3Convert FLAC to AMRConvert FLAC to CAFConvert FLAC to MKAConvert FLAC to WVConvert FLAC to SPXConvert FLAC to OGAConvert FLAC to DTSConvert FLAC to MP2
View all FLAC conversions →

Convert to AU

Other formats you can convert to AU

Convert MP3 to AUConvert WAV to AUConvert AAC to AUConvert OGG to AUConvert M4A to AUConvert WMA to AUConvert AIFF to AUConvert OPUS to AUConvert AC3 to AUConvert AMR to AUConvert CAF to AUConvert MKA to AUConvert WV to AUConvert SPX to AUConvert OGA to AUConvert DTS to AUConvert MP2 to AU
View all AU conversions →

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FLAC to AU FAQ

Converting FLAC to AU preserves the content faithfully; output also depends on the source file and any settings you choose.
Upload your FLAC file, confirm AU as the output format, and click Convert. Job status is shown while the file is processed, then you can download the AU result.
Yes. You can start with free daily conversions, with no signup required for your first jobs and no watermarks on the output. Accounts and paid plans are available for higher-volume work.
No. The FLAC to AU conversion runs in your browser on any device — Windows, Mac, Linux, iOS, or Android — with uploads and downloads over HTTPS.
FLAC is a lossless audio format that compresses audio files without any quality loss. It's like ZIP for audio.
FLAC preserves all audio data (lossless), while MP3 removes some data to reduce size (lossy). FLAC is higher quality but larger.
Converting to MP3 will reduce quality as MP3 is lossy. Choose 320 kbps when you need a higher-bitrate MP3 output.
Services like Tidal and Amazon Music HD support FLAC. Spotify uses Ogg Vorbis, so FLAC would be converted.
Processing time depends on file size, format, and queue load. The page shows job status while conversion runs.
Yes. You can add multiple FLAC files to a batch and process them together within the current file-size and credit limits.

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