Convert WEBM to MKV offline by JavaScript

Convert WEBM to MKV offline

Convert local WEBM files to MKV 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 MKV offline

Choose local WEBM video files, choose "MKV" 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	WEBM	MKV
Full name	HTML5 Video	Matroska Video
File extension	.webm	.mkv, .mk3d, .mka, .mks
MIME	video/webm, audio/webm	video/x-matroska, audio/x-matroska
Developed by	Google	www.matroska.org
Type of format	Video file format	Container format
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.	The Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows.