Editing a presentation in Microsoft PowerPoint can be time-consuming, especially if you have a lot of slides. If you want to quickly and easily change the font throughout your presentation, you should use the “Replace Fonts” tool or change the Slide Master template. These instructions work for most modern versions of Office on Windows . As for Mac users , they will need to change the Slide Master to change fonts in a presentation .

Using the Font Replacement Tool
The easiest way to replace fonts in your presentation is to use the Font Replacement. This will search for and replace all instances of a font used in your presentation.
To get started, open your PowerPoint presentation. From the Home on the ribbon bar, click the arrow next to the Replace. In the drop-down menu, select Replace Fonts.

In the “Replace Fonts” window , select the font you want to find and replace from the “Replace” drop-down menu .
Select the font you want to use from the “With” , then click “Replace” to confirm.

The “Font Replacement” tool will automatically search your presentation and replace the fonts using the settings you selected. When you’re done, click the “Close”.
You can repeat these steps to replace other fonts, or use Slide Master view to replace fonts used by the template .
Using the Slide Master
While the Replace Fonts tool offers the quickest way to replace fonts on slides in your presentation, you can also change the Slide Master template to customize your fonts. This will ensure that any additional slides you create also use the new font.
This will only apply to text in boxes that match one of the Slide Master slide templates. Any additional text (in custom text boxes) will not change, so you will need to use the “Replace Fonts” tool.
To get started, open your PowerPoint presentation and select View > Slide Master.

In the “Slide Master” view , click on one of the slide templates to view them.
To edit the fonts used by your template, select the “Fonts”, listed under the “Slide Master” on the ribbon bar.

Select the new font you want to use from the “Fonts”.

This will update the font used in the PowerPoint Slide Master template. Click the “Close Master View” to apply the changes. This will update the font in any text boxes that match your slide templates. Any other fonts (such as those in custom text boxes) will remain unchanged, so you may need to repeat the steps or use the tool .
Source: howtogeek.com
