Venn diagrams online

I’ve been preparing some figures, where I need to include Venn diagrams. I am looking to make them proportional to the values. So far, I have not found a way to do this in Gnumeric, WPS Office LibreOffice or OpenOffice.org. I guess, I should find the time to learn a little bit more of R. Meanwhile, I’ve been searching for a quick solution online.

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