How to Add an Alternative Text to a Shape in PowerPoint
- Right-click the shape, picture, chart, border of the SmartArt graphic, or other object, and then click Size and Position.
- Click the Alt Text tab, and then in the Alternative text box, enter your text.
Tip If you frequently add alternative text to a shape, picture, chart, SmartArt graphic, or other object, you can add the Alt text command to the Quick Access Toolbar to create a shortcut to it. You can find the Alt text command in the Commands Not in the Ribbon category when you add the command to the Quick Access Toolbar. If you access the Alt text command from the Quick Access Toolbar, you still need to click the Alt Text tab to add your alternative text, as in step 2 above.
Note: The Ribbon is a part of the Microsoft Office Fluent user interface