Question 1

What is an Euler diagram?

Accepted Answer

An Euler diagram is a diagram for visually expressing the relationships between multiple sets, similar to a Venn diagram. The difference is that while a Venn diagram depicts "all possible relationships," an Euler diagram depicts "only the relationships that actually exist." For example, when two sets have no common part, the circles in an Euler diagram are drawn without overlapping. This makes it possible to understand the relationships between sets more intuitively. Main uses: Expressing the components or hierarchical structure of a system Clarifying logical inclusion relationships Visualizing data relationships, as with Venn diagrams

Question 2

What is the difference between an Euler diagram and a Venn diagram?

Accepted Answer

Both Venn diagrams and Euler diagrams represent the relationships between sets, but the major difference lies in "how relationships are expressed." Venn diagram: Draws "all" possible overlapping regions. Even if a region contains zero elements, the region itself is still drawn. Euler diagram: Draws "only" the regions where elements actually exist (where the value is not zero). Sets with no common part are drawn as separate circles that do not overlap. For example, given the two sets "mammals" and "fish," a Venn diagram draws two overlapping circles and shows that their intersection is zero, whereas an Euler diagram draws the two circles completely separated, expressing more intuitively that no intersection exists.

Question 3

How do I add a circle (set) to the chart?

Accepted Answer

In the "Set Management" section, enter the name of the new set (e.g., "Animals," "Mammals") in the input field, then click the "+" button or press the Enter key. The new set will be added to the list.

Question 4

How do I add a value (overlap)?

Accepted Answer

You configure this in the "Value Management" section. First, select the sets to which you want to add a value using the checkboxes. You can select a single set, or multiple sets to specify an overlapping region. Next, enter a number in the value input field and click the "+" button to add the item to the list.

Question 5

I want to delete a set or value I added by mistake.

Accepted Answer

Click the trash can icon (🗑️) on the right side of each item shown in the "Set Management" or "Value Management" list to delete that item. When you delete a set, any values related to that set are also deleted automatically.

Question 6

Can I change the color of a circle?

Accepted Answer

Yes, you can. Click the colored square next to each set in the "Set Management" list to display a color picker. Select your preferred color to freely change the color of the circle.

Question 7

How can I save the chart as an image?

Accepted Answer

Click the "Download Image" button below the preview area to download your chart in PNG/JPEG/SVG format with your chosen quality. If you want to change the aspect ratio, drag the handle at the bottom-right corner of the preview frame to adjust it.

Question 8

Is there an auto-save feature?

Accepted Answer

Yes, there is. Your chart data is saved automatically to your browser's local storage. When you reload the page, or close and reopen your browser, you can restore the saved data. You can also revert to the default data by pressing the reset button at the top-right of the data input area. Local storage data is saved only in your browser and is not shared with other users. If local storage is disabled in your browser settings, the auto-save feature will not work. Clearing your browser cache will also delete the saved data.

Question 9

How do I save my data temporarily?

Accepted Answer

Click the "Save & Publish Chart" button below the preview area to temporarily save your chart. You can re-edit it later using the URL and password issued when you saved it. You can also publish the chart publicly via URL.

Question 10

How do I load saved data?

Accepted Answer

You can load a chart using the "Resume from Saved Data" button. When loading, enter the URL and password issued when you saved it.

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Free Euler Diagram Maker

Frequently Asked Questions

Q.What is an Euler diagram?

Q.What is the difference between an Euler diagram and a Venn diagram?

Q.How do I add a circle (set) to the chart?

Q.How do I add a value (overlap)?

Q.I want to delete a set or value I added by mistake.

Q.Can I change the color of a circle?

Q.How can I save the chart as an image?

Q.Is there an auto-save feature?

Q.How do I save my data temporarily?

Q.How do I load saved data?