This is an unpublished draft preview that might include content that is not yet approved. The published website is at w3.org/WAI/.

Images Tutorial

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Images must have text alternatives that describe the information or function represented by them. This ensures that images can be used by people with various disabilities. This tutorial demonstrates how to provide appropriate text alternatives based on the purpose of the image:

For a quick overview on deciding which category a particular image fits into, see the alt Decision Tree. The text alternative needs to be determined by the author, depending on the usage, context, and content of an image. For example, the exact type and look of a bird in an image might be less relevant and described only briefly on a website about parks, but may be appropriate on a website specifically about birds.

Why is this important?

Images and graphics make content more pleasant and easier to understand for many people, and in particular for those with cognitive and learning disabilities. They serve as cues that are used by people with visual impairments, including people with low vision, to orient themselves in the content.

However, images are used extensively on websites and can create major barriers when they are not accessible. Accessible images are beneficial in many situations, such as:

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This is an unpublished draft preview that might include content that is not yet approved. The published website is at w3.org/WAI/.