PowerPoint doesn't have a gallery of ready-made watermarks like Word has, but you can still manually add an image, like a company logo, to one or all the slides.
- 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.
