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Really simple to use is "Miro" ( mirovideoconverter.com ). Select a file, select output format and convert. This software was great when converting for specific (older) devices. But it's is probably the easiest to use that I can think of and when looking at the site they claim to support webm.
If you want more control you can go with Handbrake ( handbrake.fr ) that is also open source and you can configure all kinds of transcoding settings and should be able to convert to webm too but the crowded interface might seem a bit complex.
As with downloading any software on windows, be sure to have a virus scanner running like windows defender or any other 3rd party option.