Fast & Free
Transform OPUS, OGG, and WebM audio files to MP3 instantly.
Zero upload, 100% browser-based, works offline.
No waiting, no uploads. Process files locally at blazing speed.
Your files never leave your device. Complete privacy guaranteed.
No limits, no registration, no hidden fees. Forever free.
Everything you need for professional audio conversion, right in your browser.
Convert OPUS, OGG, and WebM audio files to high-quality MP3 format with ease.
Customize your output with professional-grade audio settings and quality options.
Powered by FFmpeg.wasm for lightning-fast conversion directly in your browser.
Maintain excellent audio quality with industry-standard MP3 encoding.
Your files never leave your device. 100% client-side processing ensures total privacy.
Experience blazing-fast conversion speeds with WebAssembly technology.
Upload your file and get started in seconds
Upload Audio File
Drag & drop or click to browse
Supported formats: OPUS, OGG, WebM • Maximum file size: 100MB
Your files are processed locally and never uploaded to any server
Say goodbye to the frustrations of traditional audio converters.
No more waiting for uploads and downloads. Convert files instantly with WebAssembly technology that processes everything locally on your device.
Complete peace of mind with 100% client-side processing. No servers, no cloud storage, no data collection. Your audio files remain completely private.
No artificial limitations or premium tiers. Convert large audio files without compression or quality loss, completely free.
Experience the difference with a converter built for the modern web.
Try It Now - It's FreeEverything you need to know about FastOpusToMP3
Yes, 100% free forever! There are no hidden costs, no premium tiers, and no limitations. We believe in providing accessible tools for everyone.
Absolutely! Your files are processed entirely in your browser using WebAssembly technology. No files are ever uploaded to our servers or any third-party service. Once you close the tab, all traces of your files are gone.
FastOpusToMP3 works on all modern browsers including Chrome (88+), Firefox (78+), Safari (14+), and Edge (88+). For the best experience, we recommend using the latest version of your preferred browser.
Currently, you can convert one file at a time to ensure optimal performance and quality. Batch processing is on our roadmap and will be available soon!
You can convert audio files up to 100MB in size. This limit ensures smooth performance in your browser while still accommodating most audio conversion needs.
Conversion speed depends on your device's processing power and the file size. Thanks to WebAssembly technology, most files under 20MB convert in just a few seconds. Larger files may take a bit longer but are still significantly faster than traditional online converters.
Once the page is loaded, the converter works entirely offline! You can bookmark the page and use it without an internet connection after the initial load.
You have full control over the output quality! Choose from 128 kbps (standard), 192 kbps (high quality), or 320 kbps (highest quality) to balance file size and audio fidelity according to your needs.
Our converter uses industry-standard FFmpeg for processing, and operates entirely in your browser. You can verify our claims by checking your network tab - you'll see no file uploads!
We respect your privacy completely. We don't track conversions, collect file information, or store any personal data. The only analytics we use are basic page views to understand traffic patterns.