OneTaskBy Tim King · Updated
Venn Diagram Maker
2, 3 or 4 Sets from a List, Free
OneTask is free, with no sign-up, and built by one person.
If this tool saved you time, a coffee helps keep new ones coming.
How the Venn Diagram Maker works
This Venn diagram maker takes plain lists and does the sorting for you. Type each set on its own line with its items after a colon, and every item lands in the region where it belongs: only in one set, shared by two, or common to all. It handles two, three or four sets, can show the items or just the count in each region, and downloads as SVG or PNG. Nothing is uploaded.
Venn diagram maker: let the lists decide the overlaps
Drawing a Venn diagram by hand means working out the overlaps first and then placing text in small lens shapes. That is where mistakes creep in: an item left in "both" that only belongs to one, or a shared item written twice. Here you only state what is in each set. The page compares the lists, groups every item by exactly which sets contain it and writes it in the matching region, so the picture always agrees with the data.
Writing the sets
Each line is one set: "Cats: fur, whiskers, tail". The text before the colon is the set's name and the items are separated by commas. An item is matched by its exact text, so "Tail" and "tail" count as two different things. Lines starting with "#" are comments. Two sets give the classic two-circle diagram, three sets give the familiar three-circle layout with seven regions, and four sets use overlapping ellipses, because four circles cannot show all fifteen possible combinations.
Where Venn diagrams come from
John Venn introduced the diagrams in an 1880 paper on representing logical propositions. They are now a staple of teaching sets and probability, and a quick way to compare products, job candidates, survey answers or the skills two teams share. For a compare-and-contrast exercise, put the features of each thing in its own set and the shared features appear in the middle.
How to read the result
- Distinct items counts every different item across all sets.
- In every set counts the items in the central region shared by all of them.
- Only in one set counts items unique to a single set, which is often the interesting part of a comparison.
Choose Counts when the lists are long and the sizes matter more than the names; hover a region to see the full list either way. Fill strength changes how solid the shapes look. Region sizes are fixed rather than scaled to the counts, so the drawing stays readable when one set is much larger. For a structured strengths and weaknesses grid try the SWOT analysis maker, and for linked ideas rather than groups use the concept map maker.
FAQ
Why does an item appear in the wrong region?
Items are matched by their exact text. A difference in spelling, capitals or a trailing word makes two separate items, so check that a shared item is typed identically in every set's list.
Can I make a Venn diagram with more than four sets?
Not here. With five or more sets the shapes needed to show every combination become hard to read, and an UpSet plot or a table usually communicates the overlaps better than any diagram.
Are the circles sized by the number of items?
No. Every set gets the same size shape so that all regions keep room for labels. The counts are in the stats below the diagram, and switching Show to Counts writes the number in each region.
What does "+3 more" mean in a region?
The region was too small to list every item, so the first few are shown and the rest are summarised. Hover the region to see the complete list, or switch Show to Counts for long lists.
See also: all Diagram Makers tools, Images, Audio, Video & Screen, PDF, SVG, Simulations & Screensavers, Generative Art, Chart Makers, 3D Model Viewers, Drawing Pads, Mockups & 3D Making, 3D Science, Tracker Music.
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