V Move
B Brush
E Eraser
L Line
U Rectangle
O Ellipse
G Gradient
R Fill
T Text
I Picker
M Select
H Hand
Z Zoom
X Swap FG/BG
[ / ] Brush size
Shift+[ / ] Hardness
1–0 Tool opacity 10%…100%
Ctrl/Cmd+Z Undo, Y/Shift+Z Redo
Space+Drag Pan
Wheel Zoom
Images can be dropped onto the canvas to create layers.