Convert OPUS to MP3 offline

Convert local OPUS files to MP3 files offline by JavaScript in your web browser without any software downloads or file uploads!

# File Name File Size Actions
How to convert OPUS to MP3 offline

Choose local OPUS files, choose "MP3" as target audio format, then click the "CONVERT OFFLINE" button to start offline conversions in bulk. Each file can be up to 2GB. Please note this offline audio converter only works in web browsers that support new technologies such as WebAssembly, Shared Array Buffer and Site Isolation. Use online converter instead if this offline converter doesn't work in your web browser.


Full name Opus Audio Format MPEG-1 or MPEG-2 Audio Layer III
File extension .opus .mp3
MIME audio/opus audio/mpeg, audio/MPA, audio/mpa-robust
Developed by IETF codec working group Fraunhofer Institute
Type of format Audio file format Digital audio
Introduction Opus is a lossy audio coding format developed by Xiph and standardized by the IETF, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low end ARM3 processors. MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is an audio coding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio streaming or storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players.
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