If you don’t want the text or picture watermark you’ve added to a slide master or slide layout, you can remove it.
Click the View tab, and then click Slide Master.
In the thumbnail pane on the left, click either the slide master or the slide layout that contains the watermark, and select the watermark.
On the keyboard, press Delete.
Note: Watermarks applied to the slide master appear on all slides, and watermarks applied to a slide layout appear on all instances of that layout that you add to your presentation. When you delete a watermark from a slide master, it is removed from all slides associated with that slide master, and when you delete a watermark from a slide layout, it is deleted from all instances of that layout in your presentation.
Remove a background watermark
To remove a picture watermark that was applied as a background, select the slide master or slide layout with the picture you want to remove, click Slide Master > Background Styles > Format Background, and then choose a new background style.
For more information about slide masters and slide layouts, see: