With alternative text (alternative text) screen readers can capture the description and read aloud. This is a help for visually impaired users. To add alternate text to an object in PowerPoint.
Adding Alternate Text to Objects in PowerPoint
As sophisticated as screen readers are, they are still not sophisticated enough to understand what an object is or what an image represents without the help of alternative text.
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To add alternative text in PowerPoint, open your presentation and select the object to which you want to add alternative text.
On the Format tab, choose Alternate Text in the Accessibility group.
<img class = "alignnone size-full wp-image-414965" data-pagespeed-lazy-src = "https://www.howtogeek.com/wp-content/uploads/2019/05/xAlt-text -option-in-format-tab.png.pagespeed.gp + jp + jw + pj + ws + js + rj + rp + rw + ri + cp + md.ic.P6clXbNY9Y.png "alt =" Alternatively, you can click right-click on the Format tab Select Edit Alt-Text from the drop-down menu.
Independent the selected method displays the "Alt-Text" section on the right hand side of the window Here you can do some things You can enter the alternative text manually in the content field (1), have PowerPoint generate a description (2) or mark the object as decorative (3).
If you mark something decorative, it should be – an object that is aesthetically pleasing nd, but does not add value to the actual content. Office uses a stylistic border that you may want to mark as decorative. This is a good example.
If you want to mark something decorative, check the box next to "Mark as decorative." The field in which you would type the alternate text manually is grayed out and displays a message that indicates that the description of the If a screen reader is not taken over, PowerPoint will generate a description of the selected object for you. Select the option "Create a description for me".
As you can see, PowerPoint offered as an alternative text for "Close-up of a logo" to our object and informs the user that the description was generated automatically. The description of Office is not wrong, but not very helpful.
If you prefer to enter the alternative text yourself, select the text box and enter the description. The general rule for alternative texts is to keep them short and descriptive. You do not need to include the words "image of" or "photo of" before your description because screen readers already announce an object as a picture.
This is all you need to do to add alternate text to your images. If you want to prevent PowerPoint from automatically generating alternate text for your newly added images, you can disable this feature. Select the "File" tab and then "Options" at the bottom of the left pane.
The PowerPoint Options window appears. In the left pane, select "Easy Access".
Next, select the "Automatic Alt Text" section and deselect "Automatically generate alternate text for me," which is on by default.If the check box is cleared, select "OK." 
PowerPoint no longer automatically generates alternative text for newly inserted images.