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Understanding the Importance of Alt Text for Web Accessibility

Introduction to Alt Text

Alternative text, commonly known as alt text, refers to the textual description of an image or a graphical element used in web design. This important feature is often overlooked but plays a fundamental role in web accessibility, especially for those who use screen readers. These descriptions serve to provide context and meaning to an image, place-holder, or any visual content that can’t be displayed or understood by users due to visual impairment.

What is Web Accessibility?

Web accessibility, in simple terms, refers to the inclusive practice of making websites accessible to all users, regardless of their abilities or disabilities. This considers various disabilities including auditory, cognitive, neurological, physical and visual disabilities. Web accessibility therefore ensures that everyone can use, understand and interact with the web equally.

The Role of Alt Text in Web Accessibility

One of the key features promoting web accessibility is alt text. Mathematically, alt text works as a function where the input is an image, and the output is a text description of that image. For users with visual impairments, who may not be able to see the images on a website, alt text provides a textual description that is read out by screen readers. Without proper alt text, these users miss out on the information conveyed by images, infographics and other visual content.

Additionally, alt text also benefits users who have turned off images, or use text-only web browsers due to low bandwidth or high data costs. In these cases, instead of the image, these users will see or hear the alt text.

Adding Alt Text to Your Website

Adding alt text to your website is a straightforward process. In HTML, the “alt” attribute is used with the “img” tag. The alt attribute holds the alternative text for an image. Here is an example of how to use it:

<img src=”image.jpg” alt=”Description of image”>

When writing alt text, ensure it’s descriptive and provides context. Simultaneously, keep it short and precise, ideally under 125 characters. Also, remember to avoid phrases like “image of” or “picture of” in alt text, as screen readers already announce the image tag.

The Impact on SEO

Beyond web accessibility, alt text also impacts a website’s Search Engine Optimization (SEO). Search engines like Google use alt text to understand the content of images. This can improve your visibility in image searches, potentially driving more traffic to your website.


To summarise, alt text isn’t just a nice-to-have feature for your website. It’s a must-have that ensures equitable access to your web content for all users. Simultaneously, it boosts your SEO, making your website more discoverable. Therefore, understanding and implementing alt text correctly can offer multiple benefits and enhance user experience appreciably.


  1. What is alt text?

    Alt text stands for alternative text and refers to the textual description of an image on a website.

  2. Why is alt text important?

    Alt text is important because it improves web accessibility and ensures that visually impaired users can understand the content of images. It also benefits SEO.

  3. How do I add alt text to my website?

    You can add alt text to your website by using the “alt” attribute with the “img” tag in your HTML code.

  4. Does alt text improve SEO?

    Yes, search engines use alt text to understand the content of images, which can improve your search engine rankings.

  5. What should I include in my alt text?

    You should include a short and descriptive value that provides context and meaning to the image. Avoid phrases like ‘image of’ or ‘picture of’ as screen readers already announce the image tag.

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