Opus to MP3 Offline Converter
Convert Opus audio (often used by WhatsApp / Discord) to MP3 completely offline in your browser
Loading Processing Engine
This tool uses FFmpeg.wasm. The first run downloads the engine (~25MB) — cached after.
Drop your OPUS files here
or click to select
Output Files
Why Use This Tool
WhatsApp Voice
WhatsApp voice messages are Opus. MP3 plays on every device.
Universal Playback
Some older players cannot read Opus — MP3 works everywhere.
100% Private
Voice messages stay on your device.
Frequently Asked Questions
Where do Opus files come from?
Opus is the audio codec used by WhatsApp voice messages, Discord voice chat, and some VoIP recordings. WhatsApp .opus or .ogg files convert cleanly to MP3.
Are my files uploaded anywhere?
No. Processing is entirely client-side via FFmpeg.wasm — files never leave your browser.
How big can my files be?
Limited by your device's RAM. ~2GB on desktop, smaller on mobile. Browser memory is the constraint.