The corner tool in Affinity Designer is accessed via the toolbar. The corner tool can be used with all kinds of paths in Affinity Designer to change corners into rounded, concave, straight and cutouts. The corner tool can be used with all the nodes in a path as well as just some nodes. You can modify the radius of the nodes via the corner tool as well as the corner type. You can use the corner tool with paths once or multiple times and modify them in countless ways. You can also restore the corners back to sharp point nodes instead of smooth nodes / rounded corners etc. You can change all the sharp nodes in seconds with the tool to create many new and unique shapes / paths in Affinity Designer. The corner tool is a powerful interactive tool but you can also change the radius via the top bar slider. The corner type can also be changed via the top bar of Affinity Designer. You can also bake the results of the corner tool and return the path to a normal path. You can also use text with the corner tool via the convert to curves. This tutorial shows you where the corner tool is and how to use it with nodes and how to drag and intractively change the radius. This tutorial shows the different corner types as well as corner radius. This tutorial also shows how to use the corner tool with Affinity Designer text.
The corner tool can be found in the Affinity Designer toolbar.
Select a path using the move tool or use corner tool itself
Select a sharp node with the corner tool (doesn't work with smooth corners)
Drag back and forth
You can use the corner tool with all kinds of shapes such as stars and polygons in Affinity Photo
Select a sharp node with the corner tool (you cannot use the corner tool with smooth corners) - it will only work with the nodes that are displayed with a little square.
Drag to a tangent to the sharp corner (though you can drag in a number of directions but the result of the drag and the generated preview circle showing the corner will be the same)
You can then see a circle that will grow bigger or smaller depending how far you move from the original node point.
You will find the corner tool will only go so far and will stop when you have reached the maximum smoothness / curve.
Once you have used the corner tool (and still have it active on that node you will see a little red dot that shows the center of the curved corner of the path. Any nodes that have been modified by the corner tool will have a little faint blue point where the original node existed before using the node tool in Affinity Designer.
The corner tool can be used multiple times on the same node as well as all the possible nodes in the path (as mentioned, if it is a point on a curve then it cannot be used with the corner tool as it is already a curved design and cannot be turned into a sharp node with the corner tool)
You can use the corner tool to create beautiful smooth stars and smooth rectangles etc (but not a smooth circle) as well as use it with many of the other paths that can be created in Affinity Designer such as gears etc
You can simply double click the 'original node' point (the faint blue square) and the node will be returned to a sharp node.
To change all the sharp nodes into smooth / curved nodes, select all the points of the shape by dragging the corner tool over the entire shape. Now all the points are selected, the corner tool can interactively change all the sharp points in seconds (actually it is good fun to see the shape mold before your eyes). You can also also use the selected points with the radius slider which can be found in the top bar of Affinity Designer. If a point isalready a smooth / curved node, the point will be unchanged
You don't have to use the interactive approach by changing the radius of the corner on the actual shape, you can also just change the radius via the slider along the top of Affinity Designer (just next to the radius type). That can be increased to the maximum point for the curve and no more
The default corner type is none and that can also be used to restore the corner back to the sharp node. The other types for the corner tool are rounded, straight, concave and cutout. The type can be changed interactively and the result will be seen with the current selected node. The other nodes do not change (any nodes not selected).
To turn all the nodes altered by the corner tool into standard curves in Affinity Designer then click the bake corners button at the top of Affinity Designer
You can use the right click context menu command 'convert to curves' to convert type / text into curves and by selecting all the nodes (sharp as well as smooth), you can then use the corner tool to curve and smooth type. The result can result in a radically different character design. You can then export the result for use in tools such as FontLab as well as the Fontself extension in Illustrator and a new font can be generated.
Select some text
Right click and convert to curves
Ungroup (if you are using more than a single character)
Use the corner tool in Affinity Designer