Convert MP3 to OPUS Online
Convert MP3 audio to OPUS instantly in your browser. Batch convert multiple files, adjust bitrate, and download - zero uploads, 100% private.
Output quality
Drag & drop files, or browse
Up to 20 audio files at once
How to convert MP3 to OPUS
Upload your files
Drag & drop or browse up to 20 MP3 files at once.
Browser converts locally
FFmpeg (compiled to WebAssembly) converts to OPUS in your browser - nothing is uploaded anywhere.
Download results
Save files individually or download everything as a ZIP bundle.
Why use this converter
100% private
Your MP3 files convert entirely in your browser - nothing is ever uploaded to a server.
Batch conversion
Convert multiple MP3 files to OPUS at once, then download them all as a ZIP.
Re-encode with control
Set a target bitrate for the new OPUS file rather than accepting a default.
No file size limits
Since nothing uploads to a server, there's no artificial cap on how large a file you can convert.
Frequently asked questions
4 questionsYes - conversion happens locally in your browser using FFmpeg compiled to WebAssembly, so there's no per-file cost, watermark, or account required.