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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 AIFF?

Audio Interchange File Format (AIFF) is Apple's uncompressed audio format, offering CD-quality sound for professional audio production.

When Should You Use AU vs AIFF?

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 AIFF When...

Reach for AIFF when your priority is professional audio production, music recording — its uncompromising quality ensures every detail is preserved.

AU vs AIFF: Key Differences

  • •The core technical difference: AU relies on lossless compression whereas AIFF uses lossless compression.
  • •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
  • •Transparency: N/A
  • •File sizes: AU files typically range Small to medium, similar to WAV and AIFF files 10MB per minute at CD quality.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while AIFF focuses on professional audio production, music recording — pick the format that matches your output requirement.

Advantages of AU

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

Advantages of AIFF

  • ✓AIFF applies lossless compression specifically calibrated for Professional audio production, music recording.
  • ✓AIFF enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓AIFF guarantees every bit of the original data survives — no approximations, no shortcuts.
  • ✓You will find AIFF support built into virtually every tool that handles Professional audio production, music recording — no plugins or converters needed.

Common Use Cases for AU to AIFF 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 AIFF Conversion

  • →Converting AU to AIFF: AIFF preserves full audio fidelity — ideal for archiving master recordings
  • →Normalize audio levels before conversion for consistent playback volume
  • →AIFF 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 AIFF formats in our detailed guide.

Troubleshooting AU to AIFF Conversion

  • !Clicks or pops in the converted AIFF → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !AIFF 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 AIFF → verify that the converter preserves channel mapping for multichannel audio
  • !The converted AIFF 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 AIFF Online - Free & Fast

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

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About AU and AIFF

AU

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

AIFF

AIFF (AIFF audio) - Audio Interchange File Format, professional uncompressed audio. Ideal for professional audio production, music recording.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from legacy unix audio, sun workstation sound to professional audio production, music recording
File Size~10MB per minute at CD quality after conversion

FAQs

Is converting AU to AIFF free?

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

How long does it take to convert AU to AIFF?

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

What is AIFF best used for?

AIFF is ideal for professional audio production, music recording. Audio Interchange File Format, professional uncompressed audio

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

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

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