Adding ALT Tags to PowerPoint

1. For a shape, picture, chart, table, SmartArt graphic, or another object, right-click it, and click Format object.
   
    
2.  A new window will pop open on the right.  Click on the third item from the left.  
   
   
    
3. NOTE: To add Alt Text to the entire SmartArt graphic or chart, click the border of the SmartArt graphic or chart, and not an individual shape or piece. In the Description box, enter an explanation of the shape, picture, chart, table, SmartArt graphic, or another object. This box should always be filled in.
    
4. If you want, in the Title box, enter a brief summary. This box should only be filled in if you are entering a detailed or long explanation in the Description box.
    
5. NOTE: Unless you have a complex chart or table, you will usually want to enter text in just the Description box. When you have complex content to describe, then filling in the Title field is useful so reading the full description is not necessary unless desired.

Writing good ALT tags takes practice. You want to be short and concise, but also descriptive in your text.

Example Image:

Good Example: Picture of Abraham Lincoln delivering his Gettysburg Address in front of a large crowd

Poor Example: Man in front of a crowd

To learn more about ALT tags, check out this WebAIM page: WebAIM: Alternative Text