Convert MP3 to Opus
Free MP3 to Opus converter that runs entirely in your browser. No uploads, no signup required.
Drop MP3 files here
or browse your device. Free, no signup required, no watermarks.
Files are processed on your device, never uploaded
Media conversions run on a full FFmpeg engine compiled to WebAssembly. The engine (~31 MB) downloads once on your first conversion, then everything runs locally.
Three steps
How to convert MP3 to Opus
Add your files
Drop MP3 files into the box above, or click it to browse. Add several to batch convert.
Convert
Opus is already selected as the output. Hit Convert. Your browser does the work locally.
Download
Save each converted Opus file. Pro ZIPs whole batches in one click.
MPEG audio layer III
MP3
MP3 is the universal audio format. It plays on every device, app, and car stereo made in the last 25 years.
Opus audio
Opus
Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls.
Why convert MP3 to Opus?
MP3 is the universal audio format. It plays on every device, app, and car stereo made in the last 25 years. Opus is the most efficient audio codec ever standardized, powering WhatsApp voice notes and Discord calls. Converting from MP3 to Opus gets you the best of the target format wherever MP3 falls short, whether that's compatibility, file size, or what your apps and devices can open. With FormatFusion the switch takes seconds and your files stay on your device the whole time.
Questions
MP3 to Opus: common questions
Is this MP3 to Opus converter free?
Yes. It is completely free with no watermarks and no account required, for files up to 1 GB each. Convert one file or a hundred.
Is it safe to convert MP3 files here?
Safer than any upload-based converter. The conversion runs locally in your browser, so your MP3 files are never sent over the internet and never touch a server.
Will I lose quality converting MP3 to Opus?
Opus is a lossy format, but we encode at high bitrate (up to 192 kbps), which is transparent for normal listening.
Can I convert multiple MP3 files at once?
Yes. Free converts up to three MP3 files at a time. FormatFusion Pro batches without limits and downloads whole runs as a single ZIP.
Does it work on iPhone and Android?
Yes. FormatFusion runs in any modern mobile or desktop browser. No app install needed.