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This property determines how wide a GuiObject|GUI's border should render, in pixels.

This property, GuiObject/BorderColor3, and GuiObject/BackgroundTransparency determine how the border of a GUI element should look.

The border width extends outward the perimeter of the rectangle. For instance, a GUI with a width of 100 pixels and BorderSizePixel set to 2 will actually render 102 pixels wide.

Setting this to 0 will disable the border altogether.

Code Samples

Button Highlight

This code sample causes the border of a parent GuiObject to highlight when the user hovers their mouse over the element.