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What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

What is VOC?

Creative Voice (VOC) is a legacy audio format developed by Creative Labs for their Sound Blaster sound cards.

When Should You Use AU vs VOC?

Use AU When...

Reach for AU when your priority is legacy unix audio, sun workstation sound — its uncompromising quality ensures every detail is preserved.

Use VOC When...

If legacy dos audio, retro computing is your end goal, VOC is the smart pick. Its exacting standards ensure your output matches your input at every stage.

AU vs VOC: Key Differences

  • •AU uses lossless compression while VOC uses lossless compression — both take the same approach to file size management.
  • •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
  • •How transparency is handled: VOC supports transparency, so alpha information is preserved during conversion.
  • •File sizes: AU files typically range Small to medium, similar to WAV and VOC files Similar to WAV for PCM audio.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while VOC focuses on legacy dos audio, retro computing — pick the format that matches your output requirement.

Advantages of AU

  • ✓AU uses lossless compression tailored for Legacy Unix audio, Sun workstation sound.
  • ✓AU is supported natively on virtually every device, browser, and operating system.
  • ✓AU files are bit-for-bit perfect, preserving every pixel and sample for professional work.
  • ✓AU integrates seamlessly with all major creative tools and workflows.

Advantages of VOC

  • ✓The lossless nature of VOC means file sizes stay reasonable while handling Legacy DOS audio, retro computing efficiently.
  • ✓From mobile devices to enterprise servers, VOC is recognized and supported everywhere.
  • ✓The trade-off for VOC's perfection is larger files — but for archival work, it is worth every megabyte.
  • ✓VOC is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for AU to VOC Conversion

  • Field recording preservation
  • Music production and mixing
  • Podcast distribution
  • Voice recordings
  • Streaming services
  • Audio books

Industry Applications

Radio BroadcastingMusic ProductionPodcastingBroadcastingAudio EngineeringLanguage Learning

Best Practices for AU to VOC Conversion

  • →Converting AU to VOC: VOC preserves full audio fidelity — ideal for archiving master recordings
  • →Normalize audio levels before conversion for consistent playback volume
  • →VOC excels in professional audio workflows
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about AU and VOC formats in our detailed guide.

Troubleshooting AU to VOC Conversion

  • !Clicks or pops in the converted VOC → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !VOC file has silence at the beginning or end → trim the source AU file before converting to avoid unnecessary padding
  • !Stereo image collapsed after converting AU to VOC → verify that the converter preserves channel mapping for multichannel audio
  • !The converted VOC clips or distorts at peaks → reduce the gain or apply a limiter before conversion to prevent hard clipping

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Convert AU to VOC Online - Free & Fast

Convert AU files to VOC online for free. High-quality conversion with no registration required.

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.au,.AU (max 100MB)

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About AU and VOC

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Best for legacy unix audio, sun workstation sound.

VOC

VOC (VOC audio) - Creative Voice, legacy sound card audio format. Ideal for legacy dos audio, retro computing.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from legacy unix audio, sun workstation sound to legacy dos audio, retro computing
File Size~Similar to WAV for PCM audio after conversion

FAQs

Is converting AU to VOC free?

Yes, GoConvertFile offers free conversion of AU to VOC for files up to 100MB. No registration required.

How long does it take to convert AU to VOC?

Most AU to VOC conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is VOC best used for?

VOC is ideal for legacy dos audio, retro computing. Creative Voice, legacy sound card audio format

What file size should I expect after converting AU to VOC?

File size after AU to VOC conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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