Convert MKV to WEBM
Convert your MKV video files to WEBM directly in your browser.
How to convert video in 3 steps
Choose a MKV video file.
Click convert to WEBM.
Download your WEBM video.
Format descriptions
MKV — MKV (Matroska) is a flexible open-source video container that supports multiple video, audio and subtitle tracks in a single file.
WEBM — WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming.
Technical comparison: MKV vs WEBM
Technical breakdown of the MKV and WEBM specifications: compression, colour, transparency and animation support.
| Property | MKV | WebM |
|---|---|---|
| Specification | MKV (Matroska Multimedia Container) | WebM (WebM Video Container) |
| Media type | Video | Video |
| Compression | Hybrid (lossy or lossless) · H.264 / HEVC / VP9 / AV1 | Hybrid (lossy or lossless) · VP8 / VP9 / AV1 + Opus |
| Color space / bit depth | 8/10/12-bit HDR | YUV 4:2:0 |
| Transparency | Not applicable | Partial support |
| Animation | Yes (animated) | Yes (animated) |
| Best for | MKV (Matroska) is a flexible open-source video container that supports multiple video, audio and subtitle tracks in a single file. | WebM is an open video container designed for the web. It uses VP8/VP9 and Opus codecs, offering small files and efficient streaming. |
What happens when converting MKV to WEBM?
The MKV data is decoded inside your browser with WebAssembly and re-encoded to the WEBM specification, so no file is ever uploaded to a server. Both formats rely on comparable compression, so file size and perceived quality stay in the same range.
Frequently Asked Questions
What is video conversion?
Video conversion changes a video file from one format to another, for example from MKV to WEBM, while keeping the video content.
Are my video files uploaded?
No. This tool processes video files directly in your browser. Your video files are never sent to a server.
Which video formats are supported?
This tool converts MKV video files to WEBM, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many video files as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in WEBM format, ready to download and use.
About the video converter
Convert MKV to WEBM video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Video Converters
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- Convert MKV to MP4Convert MKV to MP4 video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MKV to AVIConvert MKV to AVI video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert WEBM to MKVConvert WEBM to MKV video online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.