Learn the Ways to Convert WebM to MKV with Best Converters

Numerous video formats come in WebM file format, and many browsers like Google, Mozilla Firefox, Opera, and Microsoft Edge, support this type of file. However, WebM files are containers that can only store video streams compressed with VP8 or VP9 video codecs. So if you want to convert your WebM file into a file container that can hold an unlimited number of audio, video, and subtitle tracks, you must change your WebM file to MKV file format. Moreover, this article will discuss the best WebM to MKV Converters.


Part 1. Why Do You Need to Convert WebM to MKV

WebM files are video file formats widely supported by almost all web browsers. It is a file format that HTML5 often uses for video streaming purposes. In addition, it is a royalty-free file format that is mainly made for the web. This file type is also used as a container for audio and video formats. On the other hand, MKV or Matroska files contain unlimited audio, video, and subtitle tracks. So why do we need to convert WebM to MKV? Simply because the WebM files can only hold videos compressed with VP8 and VP9 codecs. While MKV files can handle multiple subtitles streams and audio tracks in various languages, that is useful for movie enthusiasts.

Part 2. Convert WebM to MKV Files Using a Lightning-Speed Converter

Everyone wants a converter that can convert files quickly. Luckily, we found a tool that can convert files in a blink of an eye. FVC Video Converter Ultimate is an offline converter that allows you to convert WebM to MKV quickly. It also supports almost all standard formats like WebM, MKV, AVI, MP4, MOV, M4V, FLV, and many more. And if you want to merge multiple files into one, this converter has a feature to do batch conversion.

FVC Video Converter Ultimate

FVC Video Converter Ultimate

5,689,200+ Downloads
  • It allows you to do batch conversion.
  • You can enhance, edit, compress your file.
  • It has a feature that can convert your file in just a few seconds.
  • It has an easy-to-use interface.

Step 1. To download the app, click the Download button below. Then follow the installation procedure and then open the application.

Step 2. After opening the application, click the Add Files button or the + sign button to upload your WebM file on the first interface of the software.

Upload WEBM File

Step 3. To choose your desired file output format, click the Convert All to button at the upper right corner of the software's interface. Select MKV, then proceed to the next step.

Select MKV

Step 4. And for the last step, click the Convert All button to start converting your WebM to MKV file. Just wait for a few seconds, and voila! Your MKV file is now ready.

Convert Into MKV

By following these simple steps and using this WebM to MKV converter, you can convert files effortlessly. Also, you can use it to convert WebM to MP3 or other audio files.

Part 3. Convert WebM to MKV Files Using FFMPEG

FFMPEG is a command-line utility commonly used for transcoding formats, video editing, scaling, and video-post production effects. Moreover, this software also allows you to convert file formats. Because it is a text-based converter, many people who want to use it are having a hard time using this converter. Nonetheless, it is also an effective and efficient way to convert WebM to MKV on FFmpeg.

Step 1. To use this converter, download the FFMPEG on your computer. Follow the installation process, then run ffmpeg.exe to your computer system.

Step 2. Locate your WebM file in your computer files, then on your folder, where your file is located, type CMD to open the command prompt for your file conversion.

Type CMD

Step 3. Lastly, type the following command ffmpeg -i sample.webm -vn -ar 44100 -b:a 192k output.mkv. Then press enter key on your keyboard, and a list of codes will appear, which signifies that your conversion is complete.

Type Command

Part 4. Convert WebM to MKV Files Online Using the Best Online Converter

One of the best online converters available on the web today is FVC Free Online Video Converter. This Converter allows you to convert numerous files, including WebM MKV, MP4, AVI, MOV, WMA, MP3, etc. This online converter is very easy to use because of its simple interface. However, since it is a web-based tool, you may experience having a slow conversion of files due to internet issues. Nonetheless, many still use this to convert WebM to MKV online, and people are satisfied with its performance.

Step 1. In your browser, search FVC Free Online Video Converter or click this link to go to their webpage.

Step 2. Then click the Add Files to Convert and launch the application. After launching the app, your computer files will appear to choose your WebM file.

Add WEBM File

Step 3. Next, choose the MKV file as your desired file format. The list of file formats is located below the software’s second interface.

Click the MKV

Step 4. Lastly, click the Convert button, then your file will start to convert.

Convert Your Files

Part 5. Comparison Chart

Features FVC Video Converter Ultimate FFMPEG FVC Free Online Video Converter
Ultra-fast Conversion Tick Mark
Batch Conversion Tick Mark
Supported File Formats Can convert WebM to MKV, MP4, MOV, AVI, M4V, FLV, +1000 more formats. It supports various file formats like AIFF, AVI, FLV, GIF, and some file formats. Allows you to convert almost all known formats like FLV, AVI, MP4, MOV, MP3, and more.
Easy-to-use Interface Tick Mark Tick Mark
Internet Connection Tick Mark

Part 6. FAQs about Converting WebM to MKV

Can I convert WebM to MKV losslessly?

Yes. By using FVC Converter Ultimate as your converter, you can change WebM to MKV without losing the quality of your file.

Why does MKV have a huge file size?

MKV files have a huge file size because it supports extra features of various audio and video tracks.

Can I convert WebM to MP4?

Indeed, a tool can decode WebM to MP4 by using various file converters available in the market. You can also read this article to know more about the topic about the conversion from WebM to MP4.


Though WebM and MKV are both file containers, it is safe to say that converting your WebM file to MKV is a good decision. And all the free online and offline converters presented above show distinct features. But if you want a converter with many unique features that can convert your WebM to MKV file ultra-fast, we believe that FVC Video Converter Ultimate is the best tool for you!


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