Convert WEBM to MP3 offline

Convert local WEBM 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 WEBM to MP3 offline

Choose local WEBM 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 HTML5 Video MPEG-1 or MPEG-2 Audio Layer III
File extension .webm .mp3
MIME video/webm, audio/webm audio/mpeg, audio/MPA, audio/mpa-robust
Developed by Google Fraunhofer Institute
Type of format Video file format Digital audio
Introduction WebM is a video file format. It is primarily intended to offer a royalty-free alternative to use in the HTML5 video tag. It has a sister project WebP for images. The development of the format is sponsored by Google, and the corresponding software is distributed under a BSD license. 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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