Grids are useful in drawing as a reference to measure the sizes of the shapes you draw. And they are nearly indispensable when you need to align objects manually on the canvas. Windows Paint has a simple grid feature to serve this purpose. Although it lacks an automatic "snap to grid" feature that more advanced graphics editors may have, it still makes your work a lot easier.
Type "Paint" in the Windows 7 "Start" menu search bar and press "Enter" to launch the program.
Click the blue main menu in the top left, click "Open" and select the picture you want to view. Or click "New" to create a blank new file. Go to the "Properties" option in the main menu if you want to set the size of the new document.
Click the "View" tab on the Paint ribbon.
Check the box for "Gridlines." A grid will appear overlaying the Paint canvas area.
Click "Zoom in" to get a closer view of the canvas. The grid lines will appear more widely spaced apart.
Click the 'Home" tab to access the Paint drawing and painting tools. Click a tool to begin drawing.
To maintain the aspect ratio of a preset shape, click the shape you want to use from the "Shapes" group, and then hold down the "Shift" key as you drag the mouse. You can also enable "Rulers" as a further aid.