Radius

Add or remove fillets (rounded corners) on individual vector corners. Click a sharp corner to round it, click again to undo.

The Radius tool rounds a single sharp corner of a vector path. Unlike the Rectangle tool's global corner_radius, this tool sets a fillet on one specific corner at a time, leaving the others alone.

Activate

Hotkey: no default
Toolbar: Modifiers Toolbar (with a numeric R input)

How to use

Select a single vector path object.
Activate the Radius tool.
Sharp corners on the selected path are marked.
Click a marker to apply the active radius value.
Click a filleted corner again to remove the fillet (sets radius to 0).

Hit detection

The hit threshold for corner markers is the larger of:

3 mm in world units, or
8 screen pixels.

Options

While the Radius tool is active, the Modifiers Toolbar shows an R number input. This is the radius value (in mm or inches depending on display unit) that will be applied to the next clicked corner.

The active value is also stored in app state (radiusToolValue) and falls back to settings.last_radius_mm (default 5 mm).

What gets modified

The selected path is modified in place via applyCornerRadius. Each corner stores its own radius value.

Result on the canvas

Sharp corners become rounded arcs of the specified radius. The original corner point is replaced by the arc's tangent points.

Node tool: finer control over each corner
Rectangle: uniform corner radius at creation
Shape Properties panel
Modifiers Toolbar