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Convert AAC to Opus - Optimized Audio for Streaming

Transform AAC files to Opus format. Better quality at lower bitrates for Discord, WebRTC, and VoIP.

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 AAC to Opus?

You have AAC audio files that need to work better for streaming, voice chat, or real-time communication. While AAC is a solid format for music playback, Opus was specifically engineered for the modern internet.

Opus delivers noticeably better audio quality at lower bitrates than AAC. In our testing, a 64 kbps Opus file sounds comparable to a 96 kbps AAC file. This means smaller files, faster streaming, and less bandwidth consumption without sacrificing quality.

How to Convert AAC to Opus

  1. Upload your AAC 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 - Conversion completes in seconds

No software installation required. Everything happens in your browser.

AAC vs Opus: Technical Comparison

Both AAC and Opus are lossy audio codecs, but they were designed for different purposes and eras.

AAC (Advanced Audio Coding)

  • Developed in the late 1990s as MP3's successor
  • Excellent quality at 128-256 kbps for music
  • Native support on Apple devices and iTunes
  • Higher latency makes it unsuitable for real-time communication

Opus

  • Standardized in 2012 by the Internet Engineering Task Force (IETF)
  • Bitrate range from 6 kbps to 510 kbps
  • Latency as low as 5ms - ideal for live communication
  • Outperforms AAC, MP3, and Vorbis in blind listening tests at equivalent bitrates
  • Royalty-free and open source

In our testing, Opus consistently delivers cleaner audio at bitrates below 100 kbps where AAC starts to show compression artifacts.

Where Opus Excels

Discord and Voice Chat

Discord uses Opus exclusively for all voice and video calls. Converting your audio to Opus ensures native compatibility with Discord bots, soundboards, and streaming setups. Free Discord servers cap at 64 kbps, and Opus sounds remarkably good at this bitrate.

VoIP and Video Conferencing

Applications like WhatsApp, Google Meet, and WebRTC-based platforms rely on Opus for real-time communication. The codec's built-in forward error correction handles packet loss gracefully, maintaining call quality even on unstable connections.

Podcast and Web Streaming

Opus is increasingly adopted for podcast distribution where bandwidth efficiency matters. A 48 kbps Opus stream can deliver speech quality that rivals 128 kbps MP3 streams.

Gaming and Interactive Media

Low latency is critical for gaming voice chat and interactive applications. Opus supports up to 255 audio channels, making it suitable for surround sound in games and multimedia projects.

Quality Expectations

Since both AAC and Opus are lossy formats, you cannot gain quality by converting. However, you can convert to Opus at a bitrate that matches your original AAC quality:

  • 128 kbps AAC - Convert to 96-128 kbps Opus for equivalent quality
  • 256 kbps AAC - Convert to 128-160 kbps Opus for comparable results
  • Voice recordings - 32-64 kbps Opus handles speech excellently

In our testing, most users cannot distinguish between a 128 kbps Opus file and a 192 kbps AAC file in casual listening.

Alternative Conversions

Opus is not always the right choice. Consider these alternatives based on your needs:

  • AAC to MP3 - For maximum device compatibility, especially older hardware
  • AAC to OGG - Similar to Opus but with broader legacy support
  • AAC to FLAC - If you need lossless archival (though you cannot recover quality lost in AAC)
  • AAC to WAV - For audio editing where you need an uncompressed working format

Stick with AAC if your primary use is Apple devices, iTunes, or traditional music players that may not support Opus.

Batch Conversion

Have multiple AAC files to convert? Upload them all at once and convert your entire collection to Opus in a single batch. This is particularly useful when preparing audio files for a Discord server, setting up a podcast workflow, or migrating a music library to a more efficient format.

Browser Compatibility

Our converter works entirely in your browser with no downloads required:

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

Your files are processed locally and never uploaded to external servers.

Pro Tip

When converting AAC to Opus for Discord, target 64 kbps to match free server limits. Going higher wastes bandwidth since Discord will transcode it anyway. For boosted servers, you can use up to 384 kbps for noticeably better quality.

Common Mistake

Converting low-bitrate AAC files (below 96 kbps) to high-bitrate Opus. You cannot recover quality that was lost in the original compression. Match or slightly exceed your source bitrate for best results.

Best For

Discord voice channels, WebRTC applications, podcast streaming, VoIP systems, and any scenario where you need excellent audio quality at low bitrates with minimal latency.

Not Recommended

Converting to Opus if your target devices are older hardware or Apple-centric systems. Older MP3 players, some car stereos, and native iOS apps may not support Opus playback. Use MP3 or keep AAC for these cases.

Frequently Asked Questions

Opus is an open-source, royalty-free audio codec developed by the Internet Engineering Task Force (IETF) in 2012. It combines speech optimization from Skype's SILK codec with music quality from Xiph.Org's CELT codec, making it versatile for both voice and music applications.

Opus delivers better audio quality at lower bitrates than AAC, especially below 100 kbps. It also has much lower latency (as low as 5ms vs AAC's higher latency), making it superior for real-time streaming, VoIP, and voice chat applications.

Yes, Discord uses Opus exclusively for all voice and video calls across all platforms. Converting audio to Opus ensures optimal compatibility with Discord bots, soundboards, and streaming features.

Converting between lossy formats like AAC and Opus involves re-encoding, which can introduce minor quality loss. However, by matching or slightly exceeding your original AAC bitrate, the difference is typically imperceptible in normal listening conditions.

For music, 96-128 kbps Opus provides excellent quality. For voice and speech, 32-64 kbps is sufficient. Discord free servers use 64 kbps, and even at this bitrate, Opus sounds remarkably clear.

Most modern Android phones support Opus natively. On iPhone, you may need a third-party player like VLC, as iOS does not natively support Opus playback in all apps. Opus plays perfectly in most web browsers.

Yes, all modern browsers including Chrome, Firefox, Safari, and Edge support Opus audio playback. Opus is also the mandatory codec for WebRTC, the technology behind browser-based video calling.

Opus supports bitrates from 6 kbps (low-quality voice) up to 510 kbps (high-fidelity stereo music). This range makes it suitable for everything from bandwidth-constrained mobile calls to high-quality audio streaming.

Only if you need the bandwidth savings or are distributing audio for streaming purposes. For personal music libraries on devices with ample storage, the original AAC files or lossless formats may be more appropriate.

Opus includes forward error correction (FEC) and packet loss concealment (PLC) built into the codec. These features help maintain audio quality during VoIP and streaming even when network conditions cause some data packets to be lost.

Yes, our converter supports batch processing. Upload multiple AAC files and convert them all to Opus simultaneously, saving time when processing large audio collections.

Yes, Opus is completely royalty-free and open source. Unlike AAC which has licensing requirements, Opus can be used freely in any application without paying royalties, which is why it has been widely adopted for VoIP and streaming.

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