Fill Tool



Draw Mode


Toolbar ‣ Fill

The Fill tool is used to automatically fill closed strokes areas.

Brush Settings

You can also configure the brush main settings exposed on the Tool Settings for convenience.

Direction Ctrl

The portion of area to fill.


Fills the area inside the shape under the cursor.


Fills the area outside the shape under the cursor.

Leak Size

Size in pixel to consider the leak as closed.


The thickness radius of the boundary stroke in pixels.


Number of simplify steps to apply to the boundary line. Higher values reduce the accuracy of the final filled area.



Sets the type of fill boundary limits calculation to perform.


Use the thickness of the strokes and the editing lines together.


Use only the thickness of the strokes (ignore edit lines).


Use only the edit lines (ignore strokes).

Show Lines (grid icon)

Toggle show help lines to see the fill boundary.


Determines which Layers are used for boundary strokes.


Calculates boundaries based on all visible layers.


Calculates boundaries based on the active later.

Layer Above

Calculates boundaries based on the layer above the active layer.

Layer Below

Calculates boundaries based on the layer below the active layer.

All Above

Calculates boundaries based on all layers above the active layer.

All Below

Calculates boundaries based on all layers below the active layer.


Multiplier for fill resolution. Higher values gives better fill boundary accuracy but slower time for calculations.

Ignore Transparent

When enabled, strokes with transparency does not take into account on fill boundary calculations.

The value slider controls the threshold to consider a material transparent.


Selecting a Brush and Material

In the Tool Settings select the brush, material and color type to use with the tool. The Fill tool uses Fill Brush types. See Brush Settings for more information.

Filling Areas

Click LMB in a closed stroke area. The tool will automatically calculate the boundary and create a new closed stroke filled with the material selected.


Original Drawing.


Use the fill tool to leak materials on closed areas.


Final filled drawing.

Boundary Strokes

If you have a large gap in an area that you want fill, you can use Boundary Strokes, a temporary help lines for closing open shapes. To create a Boundary Strokes use Alt-LMB and draw a line to close the desired area.


Original Drawing.


Add Boundary Strokes to close open areas (red lines).


Use Fill Tool to leak material on the new closed area.

When you are satisfied with the fill result you can delete the Boundary strokes using the Clean Up tool in the Grease Pencil Menu in Edit Mode.

Switch to Draw Tool

Use Ctrl-LMB to change temporary to the active draw tool. For example to manually cover small areas difficult to reach for the Fill tool. See Draw Tool for more information.