OPUS to AAC Converter
Convert Opus Interactive Audio Codec (OPUS) to Advanced Audio Coding (AAC) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files here, or browse
Processed on your device. Nothing is uploaded
Automate this. An open tab can convert whole folders via the Local API - still zero uploads.
Local API →How to use OPUS to AAC Converter
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
What is a OPUS (Opus Interactive Audio Codec) file?
Opus is a modern, open codec optimized for both speech and music at very low bitrates. It powers Discord, WhatsApp voice messages and much of WebRTC.
- Developed by
- IETF / Xiph.Org
- Initial release
- 2012
What is a AAC (Advanced Audio Coding) file?
AAC is the successor to MP3, delivering better quality at the same bitrate. It is the default audio codec for YouTube, iPhone and most streaming services.
- Developed by
- Moving Picture Experts Group (MPEG)
- Initial release
- 1997
Frequently asked questions
How do I convert OPUS to AAC?
Click “Choose Files” or drag your OPUS file onto the page, optionally adjust the settings, then hit Convert. Your AAC file downloads straight from your browser. Nothing is uploaded anywhere.
Is this OPUS to AAC converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.