You can change the space between letters as described in Letter spacing. Furthermore, there is another option: Horizontal scale.
Changing the Horizontal scale does not change the space between the letters, but the width of the characters themselves – thus the letters are distorted.
To do so, proceed as follows:
| 1. | Select the Text edit tool  in the Quick access toolbar. |
| 2. | Select the text that you want to fit. |
| 3. | Choose the ribbon command Home | group Character | Spacing and scaling  , and select Horizontal scale in the menu that appears. |
| 4. | In the following dialog box Text Scale, enter the desired value. |