UICorner

Why use UICorner?

UICorner changes the rendered corners of many GuiObjects. It is a styling helper and does not change the object’s layout size or input behavior.

Try it in Roblox Studio

Create StarterGui > PracticeGui (ScreenGui) > Button (TextButton) and put this LocalScript inside Button. Run a client to inspect the shape.

Syntax

corner.CornerRadius = UDim.new(0, 10)

Examples

Give a button rounded corners.

local button = script.Parent
assert(button:IsA("TextButton"))
local corner = Instance.new("UICorner")
corner.CornerRadius = UDim.new(0, 10)
corner.Parent = button

The UICorner must be a child of the UI object it styles.
CornerRadius combines a scale and pixel offset; this example requests a 10-pixel radius.
The button keeps the same Size and Activated behavior after its appearance changes.

Best practices

Keep corner styling consistent across related controls.
Do not rely on rounded corners alone to communicate that a control is interactive.

Runtime & versions

Luau host; Roblox engine examples require Roblox Studio. Feature availability depends on the language and runtime version used by your project; consult the official reference below.

Luau documentation