WEBM to MKV Converter

Batch convert webm files to mkv online. Change webm to mkv on Windows, Mac, iPhone and Android in 2 clicks.

Select files for conversion or drag and drop them to the upload area.
Your files are securely protected and available only to you.
All files are automatically deleted from our servers after 1 hour.

How to convert WEBM files to MKV online?

Step-by-step instructions for converting webm files to mkv

Upload WEBM-file

Click "Choose File" button to select a webm file on your computer. WEBM file size can be up to 100 Mb.

Convert WEBM to MKV

Click "Convert" button to start conversion.

Download your MKV

When the conversion process is complete, you can download the MKV file.


  • ❓ How can I convert WEBM to MKV?
    First you need to add file for conversion: drag and drop your WEBM file or click the "Choose File" button. Then click the "Convert" button. When WEBM to MKV conversion is completed, you can download your MKV file.
  • ⏱️ How long does it take to convert WEBM to MKV?
    Video conversion takes quite a while. It will probably take you a few minutes to change WEBM to MKV.
  • 🛡️ Is it safe to convert WEBM to MKV on AnyConv?
    Of course! We delete uploaded files immediately, and converted ones after 1 hour. No one has access to your files. File conversion (including WEBM to MKV) is absolutely safe.
  • 💻 Can I convert WEBM to MKV on Mac OS or Linux?
    Yes, you can use AnyConv on any operating system that has a web browser. Our WEBM to MKV converter works online and does not require software installation.

Information about WEBM and MKV file formats

Full name WEBM - HTML5 video MKV - Matroska
File extension .webm .mkv, .mk3d, .mka, .mks
MIME type video/webm, audio/webm video/x-matroska, audio/x-matroska
Developed by Google www.matroska.org
Type of format video file format Container format
Description 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. Google sponsors the development of the format, 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.
Technical details The WebM container is based on a profile of Matroska. WebM initially supported VP8 video and Vorbis audio streams. In 2013 it was updated to accommodate VP9 video and Opus audio. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF) but is entirely open in specification, with implementations consisting mostly of open-source software.
File conversion WEBM conversion MKV conversion
Associated programs VLC media player, MPlayer, K-Multimedia Player, Mozilla Firefox, Opera, Google Chrome, FFmpeg. VLC Media Player
Wiki https://en.wikipedia.org/wiki/WebM https://en.wikipedia.org/wiki/Matroska
WEBM to MKV conversion quality rating:
4.1 (1071 votes)
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