All-in-One Video Converter

Wondershare UniConverter

  • Convert WebM to MKV and other 1000+ video formats like MP4, WMV, AVI, etc.
  • Edit WebM files with trimming, cropping, rotating, adding watermarks, applying effects, etc.
  • Add and transfer WebM files from camcorder devices directly via a USB cable.
  • Versatile toolbox combines Screen Recorder, GIF maker, Media Metadata Editor, Video Compressor, etc.
WebM to MKV

MKV

1. Play MKV on Device+
  1. 1.1 Top MKV Player
  2. 1.2 Play MKV on Mac
  3. 1.3 Play MKV on Apple TV
  4. 1.4 Play MKV on Samsung TV
  5. 1.5 Play MKV on Sony TV
  6. 1.6 Play MKV on LG TV
  7. 1.7 Play MKV on PS3
  8. 1.8 Play MKV on Xbox One
  9. 1.9 Play MKV on Xbox360
  10. 1.10 Play MKV to iPhone
  11. 1.11 Play MKV to iPad
  12. 1.12 Play MKV on iPod
  13. 1.13 Play MKV on Android Phone
  14. 1.14 Play MKV in VLC
  15. 1.15 Play MKV in Windows Media Player
  16. 1.16 MKV Playback Issues in VLC
2. Convert MKV to Other Format+
  1. 2.1 Convert MKV to MP4
  2. 2.2 Convert MKV to MP4 on Mac
  3. 2.3 Convert MKV to MP4 Online
  4. 2.4 Convert MKV to MP3
  5. 2.5 Convert MKV to Audio
  6. 2.6 Convert MKV to WMV
  7. 2.7 Convert MKV to M4V
  8. 2.8 Convert MKV to AVI
  9. 2.9 Convert MKV to AVI Online
  10. 2.10 Convert MKV to FLV
  11. 2.11 Convert MKV to DVD
  12. 2.12 Convert MKV to MOV
  13. 2.13 Convert MKV to iTunes
  14. 2.14 MKV to MOV Converter Online
  15. 2.15 Convert MKV to VOB
  16. 2.16 Convert MKV to DivX
  17. 2.17 Convert MKV to MPEG
  18. 2.18 Convert MKV to MPEG2
  19. 2.19 Convert MKV to MPEG4
  20. 2.20 Convert MKV to XviD
  21. 2.21 Convert MKV to 3GP
  22. 2.22 Convert MKV to M2TS
  23. 2.23 Convert MKV to H264
  24. 2.24 Convert MKV to TS
  25. 2.25 Convert MKV to VCD
  26. 2.26 Convert MKV to AC3
  27. 2.27 Burn MKV to DVD
  28. 2.28 Burn MKV to Blu-ray
  29. 2.29 Convert MKV to SWF
  30. 2.30 Convert MKV to MP4 with Subtitle
  31. 2.31 Convert MKV to WAV
  32. 2.32 Convert MKV to MPG
  33. 2.33 Convert MKV to ISO
3. Convert Other Format to MKV+
  1. 3.1 Convert MP4 to MKV
  2. 3.2 Convert MP4 to MKV on Mac
  3. 3.3 Convert MP4 to MKV Online
  4. 3.4 Convert M4V to MKV
  5. 3.5 Convert WMV to MKV
  6. 3.6 Convert MOV to MKV
  7. 3.7 Convert DVD to MKV
  8. 3.8 Convert M2TS to MKV
  9. 3.9 Convert AVI to MKV
  10. 3.10 Convert Bluray to MKV
  11. 3.11 Convert FLV to MKV
  12. 3.12 Convert AVCHD to MKV
  13. 3.13 Convert OGM to MKV
  14. 3.14 Convert MTS to MKV
  15. 3.15 Convert WTV to MKV
  16. 3.16 Convert VOB to MKV
  17. 3.17 Convert RMVB to MKV
  18. 3.18 YouTube to MKV
  19. 3.19 Convert WebM to MKV
4. Edit MKV & Other Tips+
  1. 4.1 Extract Subtitles from MKV
  2. 4.2 Add Substitles to MKV
  3. 4.3 Add SRT to MKV
  4. 4.4 Compress MKV Video
  5. 4.5 Reduce MKV File Size
  6. 4.6 Cut MKV Files
  7. 4.7 Edit MKV Metadata
  8. 4.8 MKV No Sound
  9. 4.9 MKV Video Player for Android
  10. 4.10 MKV Converter for Mac
  11. 4.11 Free MKV Converter
  12. 4.12 MKV Player Mac
  13. 4.13 2D to 3D MKV Converter
  14. 4.14 Remux MKV
  15. 4.15 MKV Encoder
  16. 4.16 Convert MKV to FCP Mac
  17. 4.17 Stream MKV to TV with Chromecast
  18. 4.18 Import MKV to iMovie
  19. 4.19 Windows DVD Maker MKV
  20. 4.20 Convert MKV to MP4 with HandBrake Alternative

How to Convert WebM to MKV Online Effortlessly

by Kayla Morrison • 2020-09-23 16:13:23 • Proven solutions

You may find a cool video you like from the Internet, but the extension is WebM. WebM is a media format that consists of VP8-compressed video and audio streams, developed by Google as an alternative to MKV for online video sharing. Most of the media player doesn’t support this format. What do you do in that case?

You can convert WebM to MKV. But why MKV? You might ask. MKV is the most popular and open-source video container formats, supported by any third-party media player that you might use. The process for converting a video file from WebM to MKV is simple, and we have 6 different ways for you to have a try.

Part 1. Top 5 WebM to MKV Converter Online

We list 5 of the best online converters that could convert WebM to MKV Online tools. They are very useful, and you do not need to download any desktop software to handle your videos.

1. Cloudconvert

One of the very best online converters right now, Cloudconvert sets the standard by providing amplitude of options users can tweak to get a completely customized experience whenever they wish to convert any file.

Step 1: Press the Select Files button and upload your desired WebM file.

Step 2: Now, next to the file name will be a menu, from which you can choose the target format; in this case, we’ll pick MKV.

Step 3: Press the Start Conversion button at the bottom of the page and wait for it to finish converting to download your file.

convert WebM to MKV by Cloudconvert

2. Online WebM to MKV Uniconverter

This is one of the best online converters since it supports all the popular video and audio formats while providing a simple yet useful platform to convert upwards of 2 files at once with a 200MB upload limit. It’s provided and developed by Wondershare.

Step 1: Drag the desired WebM file to Media.io or click on the plus sign to open a window from which you can search for it.

Step 2: Change the format displayed in the To: section to MKV.

Step 3: Press the CONVERT button.

convert WebM to MKV by Online Uniconverter

3. Onlineconverter

Onlineconverter is a website mostly designed to be a fast and easy way to convert video or audio files of up to 200MB in size quickly.

Step 1: When you enter the page, go to Video Converter, and select MKV as the Convert to: option.

Step 2: Click on the Choose File to open an extra window from where you’ll be prompted to search for your WebM file on your computer.

Step 3: Choose the Convert button to start the process.

convert WebM to MKV by Onlineconverter

4. Convertio

Convertio is a free service to convert your video, audio and document files on the Internet with no required installation. They allow some useful modifying of conversion settings, like bitrate, framerate and aspect ratio, and currently support 300 different conversions.

Step 1: Upload your desired file by dragging it to the website itself or just click on the Choose files button and select it from your system.

Step 2: Change the format to the MKV in the dropdown menu.

Step 3: Click the Convert button to start the conversion.

convert WebM to MKV by Convertio

5. Aconvert

Aconvert is the free online converter that makes it possible to easily edit your video output and upload files from various cloud storage websites, completely free of charge.

Step 1: Click the Choose File button to add a WebM file to the website.

Step 2: Change the target format to MKV.

Step 3: Press the Convert Now! button, and after it is done converting, download your file.

convert WebM to MKV by Aconvert

Part 2. Limitations to Convert WebM to MKV Online

Online converter tools aren’t perfect and actually have some severe drawbacks that are unsuitable for those looking to convert a lot of video files regularly, here are three of the most notable limitations found in almost all free online converters:

1.Size limitation:

  • This one is present in every single one of the online converting tools, upload size limits; the exact limit varies between converters.

2.Speed limitation:

  • Free Online Converters need more time to convert the same files, comparing with the desktop video converter. Additionally, you may need a long time to download the converted file as well.

3.Output Quality:

  • Based on the web-based limitation, You could not get the desirable quality of the output.

Part 3. How to Remove the Limits to Converting WebM to MKV Online

The best way to convert WebM to MKV is just to get a professional video converting tool, and there is no better one than Wondershare UniConverter (originally Wondershare Video Converter Ultimate). It’s the best at what it does, helping users convert their video files everywhere, burn DVDs, or download their favorite videos from hosted websites. All with an elegant and intuitive design that facilitates the quick learning of the program.

video converter logo Wondershare UniConverter - WebM to MKV Converter for Windows/Mac

wondershare uniconverter
  • Convert WebM to MKV, MOV, FLV, AVI, WMV and other 1000+ formats with easy steps on Windows/Mac.
  • Burn and customize WebM files to DVD with free DVD menu templates.
  • Convert WebM files in batch with super fast speed and no quality loss.
  • Download or record videos from YouTube and other 10,000+ video sharing sites.
  • Edit WebM videos with trimming, cutting, cropping, adding subtitles, applying effects, etc.
  • Versatile toolbox combines fixing video metadata, GIF maker, video compress, screen recorder, and others.
  • Supported OS: Windows 10/8/7/XP/Vista, Mac OS 10.15 (Catalina), 10.14, 10.13, 10.12, 10.11, 10.10, 10.9, 10.8, 10.7, 10.6.
security download Security Verified, 5,481,347 people have downloaded it.

Convert WebM to MKV with Uniconverter

Step 1 Add your WebM file to the UniConverter.

First, click on the +Add Files icon to start importing your video files to Uniconverter, find the WebM file you wish to convert and select it.

convert WebM to MKV - add files

Step 2 Choose the target format to MKV.

Once the file is displayed in the converter, head over to the Setting icon, and you can select MKV.

convert WebM to MKV - choose format

Step 3 Start converting WebM to MKV.

Lastly, click on the Convert button and wait for the process to finish. It really is that simple!

convert WebM to MKV - conversion

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Kayla Morrison

Kayla Morrison

staff Editor

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