[F6] or [p]
The behavior of the pencil tool depends on the settings in its tool controls bar. To draw with this tool, press the left mouse button and drag the mouse around the canvas. The pencil will leave a trace that follows the location of the mouse cursor. When you let go of the mouse button, the shape you created will get its fill and / or its stroke. Two square, slightly transparent white handles appear at the start and end of the drawn path. When you start drawing on one of these handles, this will continue the path, instead of creating a new object.
Let's have a look at the options of the pencil tool. The Shape dropdown menu offers different brushes that influence the shape of the path:
You can set the amount of smoothing for the path you want to draw.
The button LPE based interactive simplify allows you to draw a path where you can adjust the smoothing after you have finished drawing the path. The button LPE simplify flatten will lock the result of the interactive smoothing. After it has been used, the path's smoothing can no longer be adjusted.
Additional info: LPE is the acronym for "Live Path Effect", a set of functionalities specific to Inkscape that can change paths non-destructively, to achieve spectacular results.
To reset your changes to smoothing to the default value, you can use the button where the hover text says 'reset pencil parameters to default'.
The pencil tool has three different modes. The results you get also depend a lot on the level of smoothing:
The pencil tool (as well as the pen tool) creates dots when you hold down the Ctrl key while clicking on the canvas. When you hold down both Ctrl and Shift, the dots' size will be doubled. With Ctrl and Alt, random sized small dots will be created with every click, and with Ctrl, Alt and Shift, each click will generate a random sized big dot.
Dots created with the pencil tool. Top left: with Ctrl, top right: with Ctrl + Alt, bottom left: with Ctrl + Shift, bottom right: with Ctrl + Alt + Shift. Note that the dots are really circles.
A path drawn with Shape: Ellipse and no smoothing.
The path has been extended from the square handle at its end.
Shape: Ellipse with more smoothing.
Shape: Triangle out was used here.
This path uses Shape: From Clipboard
The path that was copied to the clipboard for drawing the above path.
Path drawn with Shape: Triangle In in Bézier mode, with a smoothing of 40
Path drawn in B-Spline mode
Path with Shape: From Clipboard drawn in Spiro mode with a smoothing level of 40
The same path as above, only wider. The width of a path that uses objects on the clipboard (and those that use Shape: Ellipse, both use the Pattern along Path Live Path Effect) can be changed with the Node tool, using the white circular handle at the beginning of the path.
The width of a path with a PowerStroke Live Path Effect (used by Shape: Triangle In / Out) can be adjusted with the node tool by moving a pink, diamond-shaped node, to achieve a non-constant path width.
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