How to add a watermark to slides
Users can’t add watermark directly to slides in WPS Presentation at the moment. But we can try to add a watermark through the text box.
1. Use WPS Office to open the slides.
2. Click the Insert tab → and then click the Text Box button. Now enter the content of the watermark in the inserted text box.
3. Then adjust the text box’s settings according to our needs, such as size, position, font size and color.
This skilll could be compatible with Microsoft Office powerpoint.