AC3
→
AU

Convert AC3 to AU Online

Convert AC3 to AU online. Start with free daily conversions, no install, no watermarks, and visible job status.

AC3 to AU Converter

Upload your AC3 file to convert it to AU format

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How to Convert AC3 to AU

Follow these simple steps

1

Step 1: Upload Your File

Upload your AC3 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 AC3 to AU - Complete Guide

Converting AC3 to AU stays in the audio file family but changes the traits that decide size, quality, transparency, editability, or device support. AC3 is a audio format. Dolby Digital. AU is a audio format. Sun audio. Below is what actually changes in a AC3→AU conversion, what is preserved, and when AU is the better choice than keeping AC3.

What changes when you convert AC3 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 AC3 format

AC3 (Dolby Digital) is a surround sound audio format commonly used in DVDs, Blu-rays, and digital TV broadcasting.

  • Full name: Dolby Digital (AC-3)
  • Developer: Dolby Laboratories
  • Compression: Lossy compression
  • Opens with: VLC, Dolby-licensed receivers, FFmpeg, Plex

Where AC3 is strong: the standard surround-sound codec for DVD and digital TV; carries up to 5.1 multichannel audio; widely supported by AV receivers and home-theater gear.

Typical AC3 uses: DVD and Blu-ray soundtracks, home-theater surround sound, digital broadcast TV audio.

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

  • One AU limitation to keep in mind: dated format rarely used today.

When to convert AC3 to AU

  • Convert AC3 to AU for legacy Unix and Java system sounds.
  • Convert AC3 to AU for older audio archives.
  • Pick AU when you need stores uncompressed PCM or companded mu-law/A-law audio.

AC3 vs AU — format comparison

A quick side-by-side of the structural differences between AC3 and AU, so you can confirm this is the right conversion for your file:

AttributeAC3AU
TypeAudio fileAudio file
CompressionLossyFlexible (lossy or lossless)
Web-friendlyNoNo
Typical file sizeMediumMedium
Best forDVD and Blu-ray soundtrackslegacy Unix and Java system sounds

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Need the opposite conversion?

Convert AU to AC3

Other AC3 Conversions

More formats you can convert AC3 to

Convert AC3 to MP3Convert AC3 to WAVConvert AC3 to AACConvert AC3 to OGGConvert AC3 to FLACConvert AC3 to M4AConvert AC3 to WMAConvert AC3 to AIFFConvert AC3 to OPUSConvert AC3 to AMRConvert AC3 to CAFConvert AC3 to MKAConvert AC3 to WVConvert AC3 to SPXConvert AC3 to OGAConvert AC3 to DTSConvert AC3 to MP2
View all AC3 conversions →

Convert to AU

Other formats you can convert to AU

Convert MP3 to AUConvert WAV to AUConvert AAC to AUConvert OGG to AUConvert FLAC to AUConvert M4A to AUConvert WMA to AUConvert AIFF to AUConvert OPUS 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 →

AC3 to AU FAQ

Converting AC3 to AU preserves the content faithfully; output also depends on the source file and any settings you choose.
Upload your AC3 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 AC3 to AU conversion runs in your browser on any device — Windows, Mac, Linux, iOS, or Android — with uploads and downloads over HTTPS.
AC3 (Dolby Digital) is an audio file format. AC3 files can be played with various audio players and media applications.
Upload your AC3 audio file to the converter, select your desired output format, and click Convert. The job status appears while the audio is processed.
You can start with free daily conversions. Accounts and paid plans are available for higher-volume work, and downloaded files are not watermarked.
You can convert AC3 to proof-backed audio outputs such as MP3, WAV, AAC, OGG, FLAC, M4A, WMA, AIFF, OPUS, AC3, AMR, AU, CAF, MKA, WV, SPX, OGA, DTS, and MP2 when the source format is public-supported.
Yes! Our AC3 converter works on any device including smartphones and tablets.
Choose the bitrate or output setting that fits your file-size and playback needs. Lossy formats can reduce detail compared with the source.

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