Convert MP3 to OPUS offline

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

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

Choose local MP3 files, choose "OPUS" 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 MPEG-1 or MPEG-2 Audio Layer III Opus Audio Format
File extension .mp3 .opus
MIME audio/mpeg, audio/MPA, audio/mpa-robust audio/opus
Developed by Fraunhofer Institute IETF codec working group
Type of format Digital audio Audio file format
Introduction 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. 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.
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