Fillet
Rounds a sharp corner of a shape into a smooth curve
Written by Jacob Hartman
Updated at August 28th, 2026
Table of Contents
At a Glance
Rounds a sharp corner of a shape into a smooth curve of a chosen radius, or, with the Chamfer option, cuts it into a straight angled bevel instead. It can round one specific corner you point at, or, in Multiple Corners mode, round every qualifying corner on one or more selected shapes at once.
Use it on a Single Corner or apply it to Multiple Corners at once. The same tool can create a straight chamfer instead of a round fillet.
Parameters
| Parameter | Description |
|---|---|
| Fillet Type | Single Corner (one you click) or Multiple Corners (every qualifying corner at once). |
| Corners | In Multiple Corners mode: All, only inward (concave), or only outward (convex) corners. |
| Radius | The radius of the rounded corner (also the bevel size when Chamfer is on). |
| Chamfer | Cuts a straight angled bevel across the corner instead of rounding it. |
| Keep Original | Leaves the original shape in place and adds the rounded version as a new shape. |
Overview
Rounds a sharp corner of a shape into a smooth curve of a chosen radius, or, with the Chamfer option, cuts it into a straight angled bevel instead. It can round one specific corner you point at, or, in Multiple Corners mode, round every qualifying corner on one or more selected shapes at once.
Using Fillet
- Choose Single Corner or Multiple Corners mode.
- Single Corner: click the shape on one side of the corner, then the other side of that same corner — a preview appears. Multiple Corners: click a closed shape to select it (shift-click or lasso for more), and choose which corners qualify.
- Adjust Radius (and Chamfer/Keep Original if desired), then click Apply.
Single Corner and Multiple Corners
Use Single Corner when only one location should be changed. Click the two sides that meet at the target corner, review the preview, and apply the chosen Radius.
Use Multiple Corners to process qualifying corners across one or more closed shapes. The Corners option can limit the operation to all, inward (concave), or outward (convex) corners.
Chamfer and Keep Original
Enable Chamfer to replace the rounded fillet with a straight angled bevel of the selected size.
Enable Keep Original when the modified version should be added as new geometry instead of replacing the source shape.
Result
A new version of the shape with the selected corner(s) rounded or beveled. Unless Keep Original is checked, the original shape is replaced.
