Free online templates for constructing Venn diagrams can be found on various education websites including Classtools.net, SoftSchools.com and Education World. These websites offer diagrams with two to four circles.
Classtools.net and SoftSchools.com allow the user to create an online Venn diagram by choosing the number of circles and inputting the necessary information. Classtools.net provides a full-page template with room for a title, factors and notes about the diagram. SoftSchool.com has the user choose the desired number of circles, a title and a subtitle. The user creates a Venn diagram by dragging and dropping circles of various colors into a template. Education World does not have interactive templates, but it offers downloadable and printable templates of diagrams of up to four circles.