# Venn Diagram Maker Draw a Venn diagram for 2 to 4 sets, labeling each region with its size and intersections > Canonical page: https://elysiatools.com/en/tools/venn-diagram-maker - **Category:** Data Visualization - **Keywords:** venn, venn diagram, sets, intersection, overlap, logic, union ## Overview Parses a JSON definition of 2–4 sets (each with a name and size) plus optional intersection values, then renders an SVG Venn diagram from a fixed geometric template so overlapping regions stay readable. Each circle uses a distinct color and region labels show the supplied counts and percentages. ## Inputs - **Sets Data** (textarea): JSON with 2–4 sets (name + size) and optional intersection values keyed like "A+B" - **Chart Title** (text): Enter chart title... - **Color Scheme** (select) - **Show Labels** (checkbox) - **Show Values** (checkbox) - **Circle Opacity** (range) ## When to use - When you need to visualize overlapping data sets, such as customer segments, feature adoption, or survey responses. - When you want to generate a clean, scalable SVG Venn diagram for presentations or reports without manual drawing. - When you have exact numeric counts for 2, 3, or 4 sets and their intersections and need to display them proportionally. ## How it works - Input your set names, sizes, and intersection values in the JSON data field. - Customize the diagram by entering a chart title, selecting a color scheme (default, warm, cool, or pastel), and adjusting circle opacity. - Toggle the visibility of labels and values to control how the overlapping regions are annotated. - View and export the generated SVG Venn diagram showing the calculated counts and percentages. ## Use cases - Analyzing user overlap between different product features to guide development priorities. - Visualizing target audience demographics and shared interests for marketing campaigns. - Illustrating logical relationships and set intersections in academic or scientific reports. ## Frequently asked questions ### How many sets can I visualize in a single diagram? You can visualize between 2 and 4 sets. ### What format should the input data be in? The input data must be a JSON object containing a 'sets' array and an optional 'intersections' object. ### Can I customize the colors of the circles? Yes, you can choose from predefined color schemes including Default, Warm, Cool, and Pastel. ### How do I define intersections in the JSON? Use plus signs to join set names as keys in the intersections object, for example, 'A+B' or 'A+B+C'. ### What format is the generated diagram? 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