What is Alternative Text?
Alternative Text (Alt-text) is also referred to as an alt description or an alt attribute. Alt-text is critical for those with disabilities because it describes the function and appearance of a photo or graphic that cannot be seen and is read aloud by screen reading software. Alt-text improves the overall user experience.
Importance of Alternative Text and Where to Apply It
Alternative text (alt-text) plays a crucial role in digital accessibility by explaining why an image is relevant to the content. Screen reading software reads alt-text aloud, allowing users with visual impairments to understand the context and purpose of the image.
Most digital content and websites support alt-text, ensuring that descriptions remain intact when exported to HTML or PDF. To maintain accessibility, always provide clear and meaningful alt-text for the following elements:
- Shapes
- Pictures
- Charts
- Diagrams
- SmartArt
- Clip Art
- Tables
- Screenshots
- All Other Objects
Adding Alternative Text to Images in a PowerPoint Document
- Create a PowerPoint document.
- Insert the desired image.
- Right-click on the image and select “View Alt Text…”
- Enter a description that effectively conveys the image’s message.

- Sometimes, PowerPoint will automatically generate a description. Review the auto-generated alt-text to ensure it accurately conveys the intended message.

- Check the “Mark as Decorative” box if the image is purely decorative.

Watch and Listen to a Video Tutorial
To enhance your understanding, you can watch and listen to a step-by-step video tutorial. This will provide a visual and auditory guide to help you follow along easily.
Additional Resources
- Video for Why it is Essential to Add Alt-Text to Images (00:02:20)
- Article: How to Create Alternative Text
- Everything You Need to Know to Write Effective Alt-Text
- Use a Screen Reader With the Accessibility Checker
- Make Your Content Accessible to Everyone with the Accessibility Checker
- Make Your PowerPoint Presentations Accessible to People With Disabilities