Convert MP4 to WEBM offline by JavaScript

Convert MP4 to WEBM offline

Convert local MP4 files to WEBM files offline by JavaScript in your web browser without any software downloads or file uploads!

Files:

Target:

Options:

Video size:

Video bitrate:

Frame Rate:

Aspect ratio:

Audio bitrate:

Mute:

Remove all audio streams

Show conversion logs

OUTPUT FILES:

#	File Name	File Size	Actions

How to convert MP4 to WEBM offline

Choose local MP4 video files, choose "WEBM" as target video format, then click the "CONVERT OFFLINE" button to start offline conversions in bulk. File size 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.

Name	MP4	WEBM
Full name	MPEG-4 Part 14	HTML5 Video
File extension	.mp4, .m4a, .m4p, .m4b, .m4r, .m4v	.webm
MIME	video/mp4	video/webm, audio/webm
Developed by	International Organization for Standardization	Google
Type of format	Media container	Video file format
Introduction	MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.	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.