Add a border to an object or sheet in Numbers on Mac
You can add a border such as a picture frame or a dotted line around an image, shape, text box or video, then modify the border’s thickness, colour and other attributes. You can also use a shape to create a border around a sheet.
Note: To add or change a border for a graph, see Add a border and background to a graph. To add or change a border for a table, see Change table gridlines and colours.
Add or change a border around an object
Click to select an image, shape, text box or video or select multiple objects.
In the Format sidebar, click the Style tab at the top of the sidebar.
Click the disclosure arrow next to Border, then click the pop-up menu and choose a type of border (line or picture frame).
Use the controls that appear to adjust the look of the border.
Add a border around a sheet
To add a border, such as a solid or dotted line around a sheet, you first add a square shape to the sheet, then change the shape’s attributes so it behaves like a border. For example, you change the size of the shape, give it no fill (as opposed to a colour fill) so that it doesn’t obscure other objects on the sheet and so on.
Click in the toolbar, then select the square or rounded rectangle from the Basic category.
Drag the white squares that appear around the shape until the outer edges of the shape form the border size you want.
In the Format sidebar, click the Style tab at the top of the sidebar.
To remove the colour from the shape or select a different colour, click the pop-up menu below Fill, then click No Fill or select a different fill option.
Click the disclosure arrow next to Border, then click the pop-up menu and choose a type of border (line or picture frame).
To change the transparency, drag the Opacity slider.
To lock the border so it doesn’t get moved accidentally, click the Arrange tab at the top of the sidebar, then click Lock.