Opus to MP3 Converter – Free, Fast & Private
Convert Opus voice notes and audio to MP3 locally in your browser — recordings never leave your device
How to convert Opus to MP3
Choose or drag in your Opus file — nothing is uploaded, it stays on your device.
Conversion starts instantly — the audio is extracted and encoded to MP3 right in your browser, with live progress.
Download your MP3 file.
Everything happens right here in your browser: your file is converted locally on your device with WebAssembly FFmpeg and is never uploaded to any server. Because there is no upload, there is no practical length limit either — multi-hour recordings and files up to 8GB convert just fine, and even a huge file starts instantly. Read more: how in-browser conversion works →
About Opus to MP3 conversion
Opus is what messaging apps and voice chat run on: WhatsApp and Telegram voice messages, Discord recordings, browser calls. It is the best low-bitrate codec there is, which is exactly why it ends up on your disk as a .opus file that your music player, your car and your transcription service all refuse to open.
This tool decodes Opus and writes a standard 192kbps MP3, entirely in your browser. Voice messages are private by nature — a saved conversation, a note to yourself, an interview — so it matters that the file is never sent to a server.
Frequently asked questions
Save or export the voice message to your device — it arrives as .opus or .ogg — then drop it into the box above. It is decoded and re-encoded to MP3 locally, and you download the result. Nothing is uploaded.
Yes. Opus is almost always carried inside an Ogg container, so .opus and .ogg files are handled the same way; the tool reads what is actually inside rather than trusting the extension.
Usually yes, and that is unavoidable: Opus stays clear at bitrates where MP3 would not, so voice notes are tiny. A one-minute voice message might go from about 0.5MB to roughly 1.4MB — the cost of a format that plays everywhere.
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your recording never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing. For personal recordings, lectures and meetings this matters more than anywhere else.
Up to 8GB on desktop browsers and 2GB on mobile — big enough to pull the audio out of a multi-hour lecture or meeting recording. There is no limit on the number of files, no signup and no watermark.
192kbps, which is transparent for speech and very close to transparent for music. The audio stream is decoded once and encoded once — there is no extra generation loss from server-side re-processing.
Yes — completely free and unlimited, with no watermark, signup or daily quota. Because the conversion runs on your own device instead of our servers, there are no processing costs to charge for.
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on Windows, macOS, ChromeOS, Linux, iOS and Android. There is nothing to install.
Audio-only work is fast: there is no video to re-encode, so even the soundtrack of a long video converts in well under real time. Files whose audio is already MP3 are rewrapped without re-encoding and finish in seconds.