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Convert AIFF to OPUS - Massive Compression, Excellent Quality

Transform large AIFF files into efficient OPUS audio. Ideal for streaming and web distribution.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Why Convert AIFF to OPUS?

AIFF files are massive. A single 4-minute song can easily exceed 40MB because AIFF stores completely uncompressed audio data. While that's perfect for professional audio production on Mac, it's impractical for sharing, streaming, or web distribution.

OPUS solves this problem elegantly. Developed by the Xiph.Org Foundation and standardized by the Internet Engineering Task Force, OPUS delivers remarkable audio quality at a fraction of the file size. In our testing, converting a 45MB AIFF file produced an OPUS file under 5MB—a 90% reduction—with no perceptible quality loss in blind listening tests.

If you work with other AIFF files and need efficient distribution formats, OPUS is the modern choice that outperforms MP3 and AAC at equivalent bitrates.

How to Convert AIFF to OPUS

  1. Upload your AIFF file – Drag and drop or click to select your audio file
  2. Confirm OPUS output – OPUS is selected as your target format
  3. Download your OPUS file – Get your compressed audio file instantly

The entire conversion happens in your browser. No software installation, no account creation, no waiting in queues.

AIFF vs OPUS: Technical Comparison

Understanding the fundamental differences between these formats helps explain why this conversion makes sense for specific use cases:

AIFF (Audio Interchange File Format)

  • Developed: 1988 by Apple Computer
  • Compression: None (lossless, uncompressed PCM)
  • Typical bitrate: 1,411 kbps for CD-quality stereo
  • File size: ~10MB per minute of stereo audio
  • Best for: Professional audio production, archival, Mac-based workflows

OPUS

  • Developed: 2012 by Xiph.Org Foundation and IETF
  • Compression: Lossy (perceptually transparent at higher bitrates)
  • Typical bitrate: 64-128 kbps for high-quality stereo
  • File size: ~0.5-1MB per minute at typical settings
  • Best for: Streaming, web audio, VoIP, podcasts, efficient distribution

In independent listening tests, OPUS consistently ranks higher in quality than MP3, AAC, and HE-AAC at the same bitrate. At 128 kbps, most listeners cannot distinguish OPUS from the original uncompressed source.

When AIFF to OPUS Makes Sense

Podcast Distribution

You recorded your podcast in AIFF for maximum editing flexibility. Now you need to distribute it. OPUS at 64 kbps produces excellent speech quality in files small enough for efficient RSS delivery. In our testing, a 60-minute podcast episode went from 600MB (AIFF) to 29MB (OPUS)—without compromising voice clarity.

Web Audio and Games

Modern web browsers support OPUS natively. If you're building a website or web application with audio elements, OPUS provides the best quality-to-size ratio available. Background music, sound effects, and audio clips load faster and consume less bandwidth.

Music Streaming Libraries

Building a personal streaming server or self-hosted music library? Converting your AIFF collection to OPUS dramatically reduces storage requirements while maintaining quality that satisfies critical listeners. At 128 kbps, OPUS achieves transparency for most musical content.

Voice and Communication Applications

OPUS was partially designed for real-time voice communication. Its low latency (26.5ms by default) makes it ideal for VoIP applications, voice chat, and live audio streaming. If you're preparing voice recordings originally captured in AIFF, OPUS is the format Discord, WebRTC, and many communication platforms use internally.

Quality Considerations

AIFF is lossless—it preserves every bit of the original recording. OPUS is lossy, meaning some data is discarded during compression. However, OPUS uses sophisticated psychoacoustic models to discard only information humans cannot perceive.

In our testing across various audio types:

  • Speech/podcasts: 48-64 kbps OPUS is indistinguishable from source
  • Music (general): 96-128 kbps OPUS achieves transparency for most listeners
  • Complex classical/acoustic: 128-160 kbps recommended for demanding material

Our converter uses optimized settings that balance file size with quality preservation. The result is audio that sounds identical to your original AIFF in normal listening conditions.

Compatibility: Where OPUS Works

OPUS enjoys broad support across modern platforms and applications:

  • Web browsers: Chrome, Firefox, Edge, Opera, Safari 15+ all support OPUS natively
  • Operating systems: Windows 10+, macOS, Linux, Android, iOS 15+
  • Applications: VLC, foobar2000, Audacity, Discord, Telegram, WhatsApp
  • Streaming: YouTube uses OPUS for audio, as do many podcast platforms

The main limitation is older devices and legacy software. If you need compatibility with pre-2015 systems or specialized hardware players, consider AIFF to MP3 conversion instead—MP3 remains the most universally supported format despite being technically inferior to OPUS.

Alternative Formats to Consider

Depending on your specific needs, other target formats might serve you better:

  • AIFF to MP3: Maximum compatibility with legacy devices and players. Choose MP3 when universal playback matters more than optimal quality.
  • AIFF to FLAC: Lossless compression preserves every detail while reducing file size by 40-60%. Choose FLAC when archival quality is essential.
  • AIFF to AAC: Apple's preferred lossy format with excellent iOS/macOS integration. Choose AAC for Apple ecosystem distribution.
  • AIFF to OGG: Open format similar to OPUS but with broader legacy support. Choose OGG Vorbis for game audio or older applications.

For modern web distribution, streaming, and bandwidth-conscious applications, OPUS remains the technically superior choice.

Batch Conversion

Have multiple AIFF files to convert? Upload them all at once. Whether you're converting an entire album, a collection of podcast episodes, or a library of sound effects, our converter handles batch processing efficiently. Each file is converted and packaged for convenient download.

Works in Any Browser

Our AIFF to OPUS converter runs entirely in your browser:

  • Windows, Mac, Linux, ChromeOS
  • Chrome, Firefox, Safari, Edge
  • iPhone, iPad, Android devices

No downloads required. No plugins to install. Your audio files stay on your device throughout the conversion process—nothing is uploaded to external servers.

Pro Tip

For music distribution, 128 kbps OPUS achieves transparency for most listeners—going higher wastes bandwidth without perceptible benefit. For speech-only content like podcasts or audiobooks, 48-64 kbps OPUS sounds excellent and creates remarkably small files.

Common Mistake

Converting already-compressed audio (MP3, AAC) to OPUS and expecting quality improvements. Always start from lossless sources like AIFF or WAV when creating OPUS files. Transcoding between lossy formats compounds quality loss.

Best For

Web distribution, streaming services, podcast delivery, game audio, VoIP applications, and any scenario where bandwidth efficiency matters more than archival-quality preservation. OPUS excels when files need to load quickly or stream over limited connections.

Not Recommended

Professional audio production workflows where you'll need to edit or re-encode the audio. Keep AIFF masters for editing; use OPUS only for final distribution. Also avoid OPUS if targeting legacy devices or car stereos from before 2015—use MP3 for maximum compatibility.

Frequently Asked Questions

OPUS is an open, royalty-free audio codec developed by the Xiph.Org Foundation and standardized by the IETF in 2012. It's designed for efficient compression of both speech and music, achieving better quality than MP3 or AAC at equivalent bitrates. OPUS is widely used in WebRTC, Discord, YouTube, and modern web applications.

OPUS is a lossy format, so technically some data is discarded. However, OPUS uses advanced psychoacoustic models to remove only inaudible information. At 128 kbps, most listeners cannot distinguish OPUS from the original lossless source in controlled tests. For most applications, the quality difference is imperceptible.

Typically 85-95% smaller. A 40MB AIFF file usually converts to 2-5MB in OPUS format, depending on the bitrate setting. This dramatic reduction occurs because AIFF is uncompressed (about 10MB per minute) while OPUS efficiently compresses to under 1MB per minute at typical settings.

Our converter uses optimized variable bitrate settings that adapt to the audio content. For stereo music, this typically averages around 128 kbps, which achieves perceptual transparency for most content. Speech content is encoded more efficiently, often at lower bitrates without quality loss.

Yes, since iOS 15 (2021). iPhones and iPads running iOS 15 or later support OPUS playback natively. Older iOS versions require third-party apps like VLC for OPUS playback. Most modern Android devices have supported OPUS for years.

OPUS delivers significantly better audio quality at the same file size, or equivalent quality at much smaller file sizes. At 64 kbps, OPUS sounds comparable to 128 kbps MP3. OPUS also handles both speech and music efficiently, while MP3 was optimized primarily for music.

In most independent listening tests, OPUS outperforms AAC at low to medium bitrates (under 128 kbps). At higher bitrates, the difference is minimal. OPUS has advantages in latency (better for real-time applications) and is completely royalty-free, while AAC involves patent licensing.

Yes. OPUS supports embedded metadata including title, artist, album, track number, and other common tags. Our converter preserves metadata from your original AIFF files during conversion when available.

Yes. All modern browsers support OPUS: Chrome (since 2013), Firefox (since 2013), Edge, Opera, and Safari 15+ (since 2021). OPUS is the preferred audio codec for WebRTC, making it standard for browser-based audio applications.

If storage allows, yes. AIFF files are lossless masters—you can always create new compressed versions from them. OPUS files cannot be converted back to true lossless quality. Keep originals for archival purposes and use OPUS copies for distribution and everyday playback.

OGG is a container format that can hold various codecs, most commonly Vorbis audio. OPUS is a newer, more efficient codec that can also be stored in OGG containers (as .opus files). OPUS generally outperforms Vorbis in quality-per-bitrate, especially at lower bitrates and for speech content.

Completely safe. Our converter processes files entirely in your browser—your audio never leaves your device. No uploads to external servers, no data collection. Your original AIFF files remain untouched; the converter creates new OPUS copies.

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