Venn Diagram Maker

A Venn diagram represents sets with overlapping circles. The exclusive part of a circle contains notes that belong only to that set, while an overlap contains notes that belong to every set touching that region. This simple rule matters most in a three-circle diagram: the overlap of A and B outside C is different from the center shared by A, B, and C.

Start by defining the sets before listing observations. Labels such as “Option A” and “Option B” may be enough for a quick planning exercise, but precise labels make the result easier to interpret later. If you compare policies, products, texts, species, historical periods, or research categories, decide what qualifies for each set and use the same level of detail across all notes. The maker does not decide whether an item belongs in a region, so that reasoning remains yours.

Work from evidence, not visual convenience

Do not put a note in an overlap merely because the center has more room. Ask the membership question explicitly. In a two-set comparison, “Does this apply to both A and B?” separates the intersection from either exclusive region. In a three-set comparison, follow with “Does it also apply to C?” before choosing the center instead of a pairwise-only overlap.

Keep entries short enough to scan, but do not remove the distinction that makes them meaningful. Parallel wording helps. For example, if one region lists a feature as a noun phrase, phrase comparable features the same way. When a claim depends on a source, keep the citation or evidence in your notes outside this worksheet. The diagram has no source manager, automatic citation feature, calculator, membership checker, or fact-checking service.

Blank regions are valid. An empty intersection can communicate that you have not identified a shared item, but it does not prove that no shared item exists. Likewise, a full-looking diagram is not automatically a complete analysis. Treat the result as a representation of the material you entered, not as evidence produced by the tool.

Two circles or three circles?

Use two circles when one direct comparison answers the question. It is easier to read and provides three distinct regions: A only, B only, and A with B. Use three circles only when the third set adds useful information. A complete three-set diagram has seven distinct interior regions, and readers can easily misread a pairwise overlap as including the third set. This maker names those fields as “only” while you edit so the distinction remains visible.

Switching from two to three circles preserves the A and B labels and notes you already wrote. It does not supply a C label or invent entries for the four new regions. If you return to two circles, C-related notes stay in the private draft so they are available if you switch back, but they are not included in the two-set preview, copied summary, TXT file, or print view.

The SVG preview scales to the available width and the print layout places the diagram above its plain-text summary. Long region notes can make any Venn diagram crowded, even within the 240-character field limit. Shorten the visible notes or move supporting detail to a separate document when readability suffers. TXT contains only structured plain text. Print opens the browser dialog; that dialog may provide Save as PDF, but the maker does not create, validate, or download a PDF itself.

Your title, set labels, and region notes remain in the browser. The optional four-step flow can retain one strictly validated draft in the current tab for up to 30 minutes, using a random opaque identifier in the URL. The complete editor remains usable when session storage is unavailable. Before sharing, compare the final diagram with your source material, verify each classification, and check the printed page at the intended scale.