Free diagram tool
Venn diagrams use overlapping circles to show how sets relate — unique regions, pairwise overlaps, and multi-set intersections. FreeFlowCharts includes a free Venn diagram maker with automatic region detection and label placement, export, and API support.
When to use a Venn diagram Compare products, features, or market segments. Visualize survey cohorts and set intersections. Teach set theory or compare concepts in education. Build Ikigai-style purpose diagrams (four overlapping circles). Map audience overlap for marketing or research. What FreeFlowCharts supports Two to eight circles with automatic region geometry. Labels placed near the visual centroid of each region for readability. Export to PNG, SVG, or JSON for docs and decks. Free REST API at /api/create-venn for scripts and AI agents. No signup required to start drawing in the browser. Tips for clear Venn diagrams Prefer two or three circles for presentations; more circles get hard to read quickly. Keep region labels short — one phrase or a short list. Name each full circle clearly (the set name), not only the intersections. Use color contrast so overlaps remain legible on projectors and dark slides. How to use it 1 Open the Venn editor Visit freeflowcharts.app/venn in any modern browser.
2 Add circles and labels Define each set and fill region labels for unique and overlapping areas.
3 Adjust layout Position circles so the story of the overlap is obvious to a new reader.
4 Export or share Download an image or use the API to generate diagrams programmatically.
Frequently asked questions How many circles can I use? FreeFlowCharts supports up to eight circles with automatic region detection.
Can I create Venn diagrams via API?