Its a shame a bunch of people added a bunch of duplicates and off topic answers. Its critical that anyone researching this answer reads this Now just adjust the handles (holding Ctrl to keep everything straight) to get the desired roundedness: This adds some handles to the node to allow us to change the shape of the node.

Now that we have a point we need to allow the node to be smoothed out, and this is where the Make selected nodes symmetric button comes in. Just select the node and pull it away so it creates a point, like this:īe sure to use Ctrl+drag to drag in a straight line. Now that we have a node in the middle we can make our rounded corners. Select those nodes and click the Insert new nodes into selected segments button: This will add a third node in between the two nodes on the end, and will look something like this: If the end of your shape is flat it should have two nodes, one for each corner. Select the Edit paths by nodes tool and select your shape. I'll show how I handled a single end, but the operation should work for any shape with a flat edge. I was able to solve this using the Edit paths by nodes tool. You may have to reopen it att he end of the process. If your initial shape was open, the boolean operation will have closed it.Duplicate the cutter and repeat for all the corners you wish.

Select the original path and the cutter and do a boolean difference, if your corner is convex, a boolean union if it is concave.If necessary, rotate the cutter along its centre to align the arc with the edges of the underlying path.Activate snapping of centres of objects and cusp nodes to align the cutter exactly where you want.

Duplicate your cutter to be able to reuse it and align it put it on the corner that you want to round.

This ensures that the centre of your cutter will be aligned with the arc edges: Put the centre of the circle on one of the square corners and size the square as the circle diametre.

Subtract a circle having the radius you want from a square to create a 'cutter' shape.

This works best with paths composed by orthogonal lines that are parallel to the axis. Once i got used to it, and learned how to use the snapping options, I find that I could work pretty fast.

Inkscape drawing cirl