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Convert WEBM to MKV

Convert WEBM to MKV online for free. Upload your WEBM and get a high-quality MKV in seconds. No install, no watermark, files deleted automatically.

Free online WEBM to MKV converter

Convert WEBM to MKV in a few clicks. Add your WEBM above, and Tool Cloud converts it on our servers and gives you a MKV to download, with no software to install and no watermark.

How to convert WEBM to MKV

  1. 1

    Upload your WEBM file

    Click "Select Files" or drag and drop your WEBM into the upload box.

  2. 2

    Adjust the options

    Optionally pick quality, size or other settings for your MKV output.

  3. 3

    Download your MKV

    Click "Process", wait a few seconds, then download your converted MKV.

About the formats

WEBMWebM Video

WebM is an open video format designed for the web. It is supported by all modern browsers and produces small files, making it great for websites.

MKVMatroska Video

MKV is a flexible open video container that can hold multiple audio tracks and subtitles. It is popular for movies and series, but not every device or editor supports it.

Frequently asked questions

How do I convert WEBM to MKV?

Add your WEBM above, click "Process", and download the MKV when it is ready. It usually takes just a few seconds.

Is the WEBM to MKV converter free?

Yes. Each use costs 6 credits, and everyone gets 20 free credits every day without an account. Sign up to get 50 free credits, or buy a credit pack if you need more.

Will converting WEBM to MKV reduce quality?

Both WEBM and MKV use lossy compression. Tool Cloud converts at a high quality setting by default, so the difference is usually not noticeable.

Are my files safe?

Yes. Your files are only accessible to you, are transferred over an encrypted connection, and are deleted automatically after processing.

Can I convert multiple WEBM files to MKV at once?

Yes. Select several files at once and Tool Cloud converts them all. You can download each MKV when it is ready.

Why Tool Cloud

Fast, private and built for real work

Everything runs on our servers, so it works the same on any device.

Lightning fast

Files are processed in seconds by a dedicated worker queue, with live progress while you wait.

High quality output

Professional-grade engines like FFmpeg and Pillow keep your output crisp and faithful.

Secure & private

Uploads are only visible to you and are deleted automatically after processing.

Keep going

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