WebM to MKV
Convert your WebM files to MKV online, free and in seconds. Just upload, and the file is converted right in your browser — no software to install and no account needed.
Convert your WebM files to MKV online, free and in seconds. Just upload, and the file is converted right in your browser — no software to install and no account needed.
Upload your WebM file — drag and drop it or click to browse. You can add several at once.
MKV is already selected as the output format, so there's nothing to configure.
Click Convert and download your new MKV file.
WebM is an open, royalty-free video format built for the web. It streams efficiently at small file sizes and is supported natively by modern browsers, which makes it ideal for online video and HTML5 players.
WebM plays in all current browsers (Chrome, Firefox, Edge) and VLC; older devices or editing software may need it converted to MP4.
MKV (Matroska) is a flexible open container that holds high-definition video, multiple audio tracks and subtitles in one file. It is popular for movies and archiving, but is not natively supported by every device or browser.
MKV plays in VLC and most modern media players; some phones, browsers and TVs need it converted to MP4 first.