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Draw and insert a polygon

You can use a grid to draw your own polygon shape in draw.io and add it to the drawing canvas.

Select Arrange > Insert > Polygon from the menu.

Draw the polygon​

  • Click on the grid to add a point. You need a minimum of three points for a closed polygon.
  • To draw a non-closed polygon, deselect the Close Path checkbox at the bottom of the dialog.
  • Drag points to new positions in the grid.
  • Deselect Grid at the bottom of the dialog if you want to work without a grid.
    You can insert note shapes via Arrange > Insert > Note in draw.io

The co-ordinates of each point of the polygon will appear in a list on the right

  • Drag them into a new position in the list using the left horizontal line icon.
  • Click on the trash icon to the right of any point to delete it.
  • Make the line between two points into an arc by selecting the checkbox next to the co-ordinate. Drag the orange arc points to increase or decrease the curvature.
    Turn a straight edge of a polygon into an arc

At the bottom left of the dialog, you can Undo and Redo changes, Zoom In and Zoom Out, and start over when you click Delete All

Once you have finished drawing your polygon, click Apply to add it to the drawing canvas.
You can insert note shapes via Arrange > Insert > Note in draw.io

Edit an existing polygon​

Right-click on the polygon shape to open it in the polygon editor. Alternatively, select the polygon, then select Edit > Polygon from the menu.

Note: this only works with polygons drawn in this polygon editor.