Try it!
Adding a graphic as a watermark behind the text of your slides is a great way to display a logo or other meaningful image. PowerPoint lets you adjust the picture's transparency after you put it on the slide.
-
To add a logo to all the slides, Select View > Slide Master. Scroll to the top of the thumbnail pane on the left, and select the first item, the slide master.
-
Select Insert > Shapes, pick a shape and then click and drag to draw the text box on the slide master. It should be about the same size as your logo.
Note: If your logo is circular, use a circle shape.
-
Right-click on the shape > Format Shape to open the menu.
-
Under the bucket icon, select Fill > Picture fill > File and insert your logo image. Adjust darkness of the logo with the Transparency slider.
-
To remove the border around the image, select the logo. Then right-click > Outline > No Outline.
-
Exit Slide Master. All slides except title pages will have the logo.