Convert WebM to MKV Online

About WebM (source)

WebM is a web-focused container designed for HTML5 video. It usually holds VP8 or VP9 video with Opus or Vorbis audio. Chrome, Firefox, and Edge play WebM natively; Safari support improved in recent versions. Screen recorders and web apps often export WebM.

Where WebM shows up:

• HTML5 <video> players on websites
• Chrome and OBS screen recordings
• Discord and web app exports
• Open, royalty-free web delivery

About MKV (target)

MKV (Matroska) is an open, highly flexible container built for archival and home theater use. It supports multiple video, audio, and subtitle tracks in one file, plus chapters and attachments. MKV is common for Blu-ray rips, anime fansubs, and Plex/Kodi libraries.

Where MKV is used:

• Blu-ray and DVD rips with commentary and multiple languages
• Anime and foreign films with soft subtitles
• Plex, Jellyfin, and Kodi media servers
• Preserving multiple audio tracks without splitting files

Converting WebM to MKV

Pros

• Keeps multiple audio and subtitle tracks in one file
• Open format with excellent Plex/Kodi support

Cons

• Not natively supported on iPhone or many TVs
• Social platforms often reject MKV uploads

Caveats

• WebM to MKV usually requires transcoding because legacy codecs do not fit the target container cleanly.
• Muxara maps the primary video and audio streams. Extra subtitle or audio tracks may not carry over unless you choose subtitle handling in the converter settings.
• Uploads are processed on dedicated workers and deleted within 24 hours. For offline batch work, use the free Muxara Mac app.