| Space | Switch ruler mode between horizontal, vertical and two-dimensional. |
| Z | Select a window to measure. Cancel with 'Esc'. |
| Arrow keys | Move the ruler by one pixel. |
| Shift + Arrow keys | Move the ruler by one medium step (defaults to 5px). |
| Ctrl + Arrow keys | Resize the ruler by one pixel. |
| Ctrl + Shift + Arrow keys | Resize the ruler by one medium step (defaults to 5px). |
| Alt + Arrow keys | Dock the ruler to screen boundaries. |
| Ctrl + C | Copy current length to clipboard. |
| L | Set marker at current length. |
| C | Remove the first custom marking line. |
| Esc | Exit Screen Ruler, window selection or help. |
| See more keyboard actions in context menu. |