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How does the lack of alt text impact a website’s accessibility and SEO?

This article will explore an important topic affecting website accessibility and SEO: the lack of alt text for images. As a website owner or SEO professional, understanding the impact of alt text and its absence is crucial for optimizing your site and ensuring a positive user experience. This document aims to provide concise information and actionable tips to address issues related to alt text, allowing you to enhance your website’s accessibility and improve its search engine rankings.


Alt text, short for alternative text, is a textual description provided for images on a web page. It serves as a replacement for images when they cannot be rendered or displayed properly. Alt text is essential for individuals with visual impairments who use screen readers or other assistive technologies to access and understand web content. By including descriptive alt text, you can make your website more accessible to a wider audience, including people with disabilities.

From an SEO perspective, alt text plays a crucial role in providing search engines with information about the content and context of an image. It helps search engines understand the image’s relevance to the surrounding text and the overall topic of the page. Alt text also contributes to image search optimization, allowing your images to be indexed and ranked appropriately in search engine results pages (SERPs).

Common Issues:

Despite the importance of alt text, several common issues and challenges can arise:

  1. Missing Alt Text: The most prevalent issue is when images lack alt text altogether. This happens when alt attributes are not added or are left blank, resulting in images being unidentifiable to assistive technologies and search engines.
  2. Empty Alt Text: Another issue is using alt attributes with empty or null values. This occurs when alt text is included as an empty string or simply left blank in the HTML code. This provides no meaningful information to users or search engines.
  3. Redundant Alt Text: Sometimes, alt text may be used excessively, repeating the surrounding text or simply stating the obvious. This redundancy can be misleading and confusing for users relying on screen readers.

Impact and Consequences:

The lack of alt text for images can have detrimental effects on website accessibility and SEO:

  1. Accessibility Barriers: Without alt text, visually impaired users are unable to understand the content and purpose of images on your website. This creates a significant accessibility barrier, hindering their ability to navigate and engage with your content effectively.
  2. Poor User Experience: Incomplete or missing alt text can lead to a poor user experience for all users, not just those with disabilities. Images that lack descriptive alt text provide no context or visual cues, making it difficult to comprehend the intended message or purpose of the image.
  3. Missed SEO Opportunities: Search engines rely on alt text to interpret the content and relevance of images. Without alt text, search engines struggle to understand the image’s context and may overlook it when indexing and ranking your website. This can lead to missed opportunities for organic visibility and lower search engine rankings.

Addressing Alt Text Issues:

To address the lack of alt text for images and improve website accessibility and SEO, consider the following tips:

  1. Add Descriptive Alt Text: For each image on your website, provide descriptive alt text that accurately describes the image’s content, purpose, and context. Be concise yet informative, and avoid keyword stuffing. Focus on providing value to visually impaired users and search engines.
  2. Use Empty Alt Text When Appropriate: If an image is purely decorative and doesn’t add any meaning or context to the content, use empty alt text (alt=””) to indicate to assistive technologies that the image is irrelevant.
  3. Verify Alt Text Accuracy: Regularly review and verify the accuracy of the alt text you have assigned to images. Ensure that the alt text aligns with the actual content and context of the image. Over time, website content may change, and images may be updated or replaced. It’s essential to keep the alt text up-to-date and relevant.
  4. Consider Context and Surrounding Content: When writing alt text, consider the context in which the image is placed and the surrounding content. The alt text should provide a clear and meaningful description that enhances the overall comprehension of the webpage. Consider the image’s purpose and how it contributes to the surrounding text.
  5. Use Proper HTML Markup: Use correct HTML markup to add alt text to images. Ensure that the alt attribute is included within the image tag and follows the proper syntax (alt=”description”). Avoid using alt text in other HTML elements, such as divs or spans, as assistive technologies may not recognize or read it.
  6. Test with Screen Readers and Validation Tools: Test the accessibility of your website by using screen readers or other assistive technologies. These tools can help you experience your website from the perspective of visually impaired users. Additionally, utilize validation tools that check the accessibility of your web pages, highlighting any missing or improper alt text.
  7. Educate Content Contributors: If you have multiple contributors to your website’s content, provide guidelines and training on how to write effective alt text. Educate them about the importance of alt text for accessibility and SEO and encourage them to provide descriptive alt text for all images they upload consistently.


Understanding the impact of the lack of alt text for images is crucial for optimizing your website’s accessibility and SEO. By providing descriptive and accurate alt text, you make your content more accessible to visually impaired users and improve the overall user experience. Additionally, search engines rely on alt text to interpret and index your images, influencing your search engine rankings. Ensure you address alt text issues promptly, following the best practices outlined in this document, to enhance your website’s performance and reach a broader audience. Refer back to this resource whenever you encounter alt text-related challenges during your site audits and SEO efforts.


Larry Norris

With over 5 years of experience in agency work as an SEO Manager, I am proud to have assisted many clients in achieving higher search engine rankings and a stronger online presence. My successful track record includes top 3 rankings in SERPS, the attainment of featured snippets, and increased website domain authority.