Convert WEBM to MP4 offline by JavaScript

Convert WEBM to MP4 offline

Convert local WEBM files to MP4 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 WEBM to MP4 offline

Choose local WEBM video files, choose "MP4" 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.

Name	WEBM	MP4
Full name	HTML5 Video	MPEG-4 Part 14
File extension	.webm	.mp4, .m4a, .m4p, .m4b, .m4r, .m4v
MIME	video/webm, audio/webm	video/mp4
Developed by	Google	International Organization for Standardization
Type of format	Video file format	Media container
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-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.