Double-space the lines in a document
You can double-space all or part of a document. Changes that you make to the spacing are saved when you save the document, but you can make additional changes at any time.
What do you want to do?
Double-space the entire document
On the Home tab, in the Styles group, right-click Normal, and then click Modify.
Under Formatting, click the Double Space button, and then click OK.
Formatting for the entire document changes to double spacing.
Double-space the selected text
Select the text that you want to change.
On the Home tab, in the Paragraph group, click Line and Paragraph Spacing.