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What is AIFF?

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

What is AU?

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

When Should You Use AIFF vs AU?

Use AIFF When...

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

Use AU When...

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

AIFF vs AU: Key Differences

  • •AIFF uses lossless compression while AU 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: AU supports transparency, so alpha information is preserved during conversion.
  • •File sizes: AIFF files typically range 10MB per minute at CD quality and AU files Small to medium, similar to WAV.
  • •Primary audience: AIFF is built for professional audio production, music recording scenarios, while AU focuses on legacy unix audio, sun workstation sound — pick the format that matches your output requirement.

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.

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.

Common Use Cases for AIFF to AU Conversion

  • Professional broadcasting
  • Video game audio assets
  • Film soundtracks
  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation

Industry Applications

Audio ArchivingGame AudioFilm Post-productionAudiobook PublishingMusic StreamingLive Sound

Best Practices for AIFF to AU Conversion

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

Troubleshooting AIFF to AU Conversion

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

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About AIFF and AU

AIFF

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

AU

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

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from professional audio production, music recording to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting AIFF to AU free?

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

How long does it take to convert AIFF to AU?

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

What is AU best used for?

AU is ideal for legacy unix audio, sun workstation sound. Sun AU, legacy Unix audio format for Sun workstations

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

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

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