Eraser Tool

Keyboard shortcut E toggle between and
Use the Eraser tool to erase pixels to achieve transparency.
Tool Options

Brush mode will erase using brush strokes, while Pencil tool mode will erase with hard-edged strokes.
You can also set eraser opacity.

Brushes palette

In the Brushes palette, you can select preset brushes, but you can also modify existing brushes and design new custom brushes.
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Painting Tools

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