How to set roundness of retangle? #10776

Excalidraw has a "round" vs "sharp" toggle for rectangles (top-left toolbar when a rectangle is selected), but the corner radius itself is not user-configurable — it uses a fixed algorithm.

From the source (packages/common/src/constants.ts):

// NOTE right now we don't allow configuration and use a constant radius
ADAPTIVE_RADIUS: 3,  // Fixed 32px radius

Three rounding algorithms exist internally:

• LEGACY (type 1) — proportional, legacy compat
• PROPORTIONAL_RADIUS (type 2) — 25% of shorter side (for diamonds/lines)
• ADAPTIVE_RADIUS (type 3) — fixed 32px (current default for rectangles)

So the maximum roundness you can get on a rectangle is 32px corners (or 25% of the shorter side for very small shapes). To get the fully-rounded "pill" shape in your screenshot, you'd either need a rectangle small enough that 32px dominates both sides, or use an ellipse element instead.

There's no slider or input to increase the radius beyond the built-in value at this time.

You can also try using the boolean operation script. Basically take a rectangle, put circles at the ends, and then join them together with the union operation.