Inserting a watermark in PowerPoint
Microsoft Word has a feature to insert a watermark, but not PowerPoint. Here's how you can insert a watermark with the help of Custom Animation (Emphasis > Transparency):
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First, you will need to enter the Slide Master. Click View > Master > Slide Master.
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If you have a watermark image, insert it on the content master. If not, you can insert text or WordArt (the 2nd style) onto the content master.
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Next, click Slide Show > Custom Animation.
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Select the watermark, click Add Effect > Emphasis > Transparency. The default will give it a 50% transparency. You can adjust the setting according to your preference.
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Set the Start from "On click" to "After Previous". This will allow the transparency to start automatically.
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Now, right click on the watermark and select Order > Send to back.
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Finally, close Master View.