Convert Opus to MP3

Convert Opus audio files to MP3 in your browser — including WhatsApp voice messages. No upload, no signup — files never leave your device.

Drop an Opus file here

or click to select a file — WhatsApp voice messages work too

Opus, OGG, OGA — up to 500 MB

The FFmpeg engine (~25 MB) downloads on first use and is cached by your browser. Audio is converted entirely in-browser — nothing is uploaded.

How to use

  1. Drop an Opus file or click to select one (.opus and .ogg both work).
  2. Choose the MP3 bitrate — 128 kbps is plenty for voice messages.
  3. Click "Convert to MP3" and download the result.

Frequently asked questions

How do I convert a WhatsApp voice message to MP3?

Export the voice message from WhatsApp (share or save it — it will be an .opus file), then drop it into this tool, choose a bitrate, and download the MP3. The conversion happens in your browser; the recording is never uploaded anywhere.

What is an .opus file?

Opus is a modern audio codec optimized for speech and low bandwidth. WhatsApp, Discord, Telegram, and Signal all use it for voice messages. It sounds great at tiny file sizes, but many players and editors still cannot open it — which is why converting to MP3 is so common.

Does Opus to MP3 conversion lose quality?

A little — both formats are lossy, so re-encoding discards some detail. For voice messages the difference is inaudible at 128 kbps or higher. Choose 192 kbps if you want a safe default.

Are my voice messages uploaded to a server?

No. The conversion runs entirely in your browser using FFmpeg compiled to WebAssembly. Your recordings never leave your device — there is no upload, no server, and no account.

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