Convert MP3 files into the efficient Opus format, which shines especially with speech and low bitrates. Conversion runs right in your browser, with no upload of your audio.
In “Local” mode your file never leaves your device. No uploads, no server – ideal for sensitive recordings.
Pick “Local” for full privacy or “Server” for very large files and every format.
No sign-up, no queue, no watermark. Choose a file, convert, download.
No. Opus is very efficient, but it can't bring back the detail already lost in the MP3. Since both are lossy, you tend to lose a little rather than gain.
Mainly for voice recordings, podcasts and web streaming, where Opus sounds great at a small file size and is increasingly common.
In modern browsers, many messengers and current players. On older devices, though, support can be limited.
No, conversion runs locally in your browser by default. For very large files you can optionally use a server mode.