Why Accessibility Matters for SEO

Historically, SEO and web accessibility were separate and not equal activities. SEO was managed by the SEO practitioner and primarily focused on keywords, rankings, and traffic. Web accessibility was handled by the development team and typically came much later in the process, as it primarily addressed legal requirements.

But that is old-school. As Google continues to prioritize user experience (UX), a site that is not user-friendly is also not bot-friendly. This leads to an interesting question for today’s webmasters and content providers:

Does Accessibility Even Affect Your SEO?

The answer is yes. Accessibility isn’t just a legal obligation; it’s also an essential part of a good SEO strategy. In this article, we’ll explain why, how, and what the advantages of accessible web design are, and what you can do to improve both your website’s accessibility and your search engine rankings.

Estimated reading time: 9 minutes

Disclosure: This article was partially written with AI and reviewed/edited by a human expert.

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Website Accessibility Definition

Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can use them. Disabilities can be auditory, cognitive, neurological, physical, speech, or visual.

The idea is to eliminate impediments to engaging with or visiting a website. Imagine you’re blind and navigating the internet with a screen reader, a program that reads aloud the on-screen content. If a website isn’t built to certain coding standards, a screen reader may struggle to read it effectively, limiting the user experience.

Resource: searchengineland.com

The international standard for these practices is the Web Content Accessibility Guidelines (WCAG). These guidelines specify the technical requirements for improving the accessibility of web content. This includes things like:

• Alt text (Alternative text): Alt text for images that screen readers will read aloud if the image doesn’t load or the user is blind or unable to see the image.
• Keyboard navigation: The ability to use a website without the need for a mouse.
• Color contrast: The ability for text to be easily read on top of background images and colors.

Accessibility and SEO: The Connection

The connection between accessibility and SEO largely stems from the nature of search engine crawlers. Google’s bots are essentially the most literal example of a “blind” user. They can’t “view” an image, watch a video, or enjoy a beautifully designed site. They read the HTML to determine what is on a page and how it is structured.

Accessing a website is akin to searching it – as you search-engine-optimize (SEO) your site, you screen-reader-optimize it. Both devices are using the same attributes:

• Clear hierarchy of structure (headings)
• Audio descriptions of movies, TV shows, and other films
• Logical navigation paths
• Descriptive link text

If your screen reader can’t navigate a page because of some bad coding, neither can a Google bot. And when Google can’t properly crawl your site, you don’t rank as well as you could. So accessibility and SEO aren’t in conflict — they’re related parts of the website development Venn diagram.

Advantages of Accessibility for SEO

Making your website more accessible actually improves your SEO. WCAG compliance supports Google’s top-ranking signals related to UX — and it all starts with a better User Experience (UX).

Source: elfsight.com

User engagement metrics play a big role in Google’s algorithm. Bounce rate and dwell time are strong indicators of a page’s usefulness. Accessible sites are always more usable. You know what helps everybody? Consistent navigation, clear typography, and well-structured content. Making it easy for users to find what they need means they’ll spend longer on your site. Google will look at this and think, hey, this page must be pretty good!

Improved Crawling

Google, or any other search engine for that matter, can’t rank something it doesn’t know anything about. These accessibility improvements provide Google with a clearer view of what’s on the page. For example, when using the correct heading tags (h1, h2, h3, h4, etc.), you’re helping Google figure out what the most important pieces of your content are. Without using these, it’s just a big blob of text. This structure helps search engine crawlers know what to index, and that means a better chance of ranking for the keywords you want.

Reach a wider audience

The World Health Organization estimates that about 16% of the world’s population, or 1.3 billion people, has a significant disability. If you don’t care about accessibility, you’re basically putting a roadblock in front of a pretty big chunk of that traffic. SEO is getting people to your website; accessibility is helping your website be usable by all of them. Plus, accessible websites tend to perform better on mobile and low-bandwidth connections, widening your audience even further.

Resource: guides.cuny.edu

Regulatory Compliance and Risk Management

Accessibility lawsuits are increasingly common. Essentially, you’re discriminating against people with physical impairments if they can’t properly read or use your site. This could include, but is not limited to, poor or no access to:

• Make an online payment
• Apply for a job
• Download documents
• Schedule an appointment

More and more, search engines can gauge user engagement. If people visit your site and quickly leave, it can be a bad signal and can adversely affect rankings.

Resource: civicplus.com

Why Accessibility Is an SEO Ranking Factor

This doesn’t mean you have to transform your entire website immediately to realize the benefits. Some key changes will make a big difference to both web accessibility and your search ranking.

ALT Text

Think of image alt text as a short description of what an image is.

• Accessibility: This is how you communicate an image’s content to a blind user.
• SEO: Helps the image show up in Google Images results and also gives the search engine a sense of what’s on that page.
• Best Practice: Use readable, descriptive words. It doesn’t have to be lengthy. Instead of “Photo 01,” use “Woman smiling and looking up to the sky.” Also, avoid keyword stuffing. Instead of “red shoes buy shoes,” use “Red leather running sneakers with white laces.”

Semantic HTML and Heading Structure

Semantic HTML

Semantic markup is HTML code that helps web browsers and search engines understand the ‘parts’ of your content. Common HTML5 semantic markup tags include:

• <header>
• <nav>
• <main>
• <article>
• <aside>
• <footer>

Semantic markup was added in HTML5 to replace the old way of coding, e.g., <div id=”header”>. By using semantic markup, you allow people with disabilities to skip headers, navigation, and such, and to browse content more quickly via <main> or <article>. Adding semantic markup also helps search engines better understand what this page is about by putting it within <main> tags. This improves internal linking and boosts link strength throughout your site.

Read more about: What Is Internal Linking? Why Is It Important for Local SEO?

Headings

Headings help screen readers navigate to the sections of a page that the user is interested in. Search engines use headings to figure out how your content is structured.

• Accessibility: This page can be accessed by skipping from H2 to H2.
• SEO: Keywords in headings are worth more than keywords in the body of the page.
• Best Practice: Have only one h1 tag on the page (it should be the page title). Main sections should use h2, and subsections should use h3 and h4. Never use headings to make text big or bold; use CSS or a local span style for that.

Video Accessibility

Video makes for great content, but search engines primarily rely on transcripts and metadata since they cannot directly ‘see‘ video visuals.

• Accessibility: Captions are important for the deaf and hard of hearing, and transcripts are important for those who rely on Braille readers.
• SEO: A transcript of your video is a crawled and indexable piece of content that can help your video rank for keywords spoken in the video.
• Best Practice: Provide a text transcript of the content in the embedded videos and audio.

Information Architecture and Navigation

The screen reader has trouble navigating complicated drop-down menus, and “click here” buttons don’t give search engines much to go on.

• Accessibility: Navigation should be consistent and predictable. Hyperlinks should be descriptive.
• SEO: Descriptive anchor text gives Google an idea of what the page that it’s linking to is about.
• Best Practice: “Read our full guide on accessibility standards.” (rather than “Click here to read more.”)

Busting SEO & Accessibility Myths

Below we provide the reality as bust myths.

Myth: Accessible design is expensive and difficult.

Reality: Although it may require additional effort to make an older site accessible, incorporating it into the development process is relatively inexpensive. In fact, the maintenance cost of accessible code can actually be less, since the code tends to be leaner and better structured.

Myth: Accessibility hurts aesthetics.

Reality: Inclusive design doesn’t equate to bad design. Contrasting colors and clear typography are key features of modern, minimalist design (e.g., Apple’s or Google’s Material Design).

Myth: It’s just for a specific niche.

Reality: This is called the “Curb Cut Effect.” Curb cuts were intended for wheelchair users, but are also used by people with strollers, delivery carts, and suitcases. Similarly, captions intended for deaf viewers are also used by people who want to watch videos without sound in public spaces. Accessibility features enhance the experience for everyone.

Accessibility and SEO Resources

• Google Lighthouse: A free, open-source, automated tool for improving the quality of web pages. It includes audits for performance, accessibility, progressive web apps, SEO, and others. It runs within the Chrome browser.
• WAVE (Web Accessibility Evaluation Tool): A set of tools used to aid authors in making their Web content more accessible to people with disabilities. It offers visual feedback about the accessibility of your Web content.
• Axe: A browser plugin that helps developers do a quick accessibility check.
• Semrush/Ahrefs: Technically not an accessibility tool, but page structure reports can reveal broken links, missing alt text, and slow page load speeds.

Conclusion

Search engines have become human-like. Anything that’s inaccessible to humans is also inaccessible to search engines. When you take measures to improve accessibility (e.g., semantic HTML, alt text, transcripts), you’re not only becoming legally or ethically compliant. You’re also creating a technically stronger website that’s more crawlable, indexable, and rankable. Making accessibility a fundamental part of your SEO approach is a competitive edge that helps ensure the longevity, reach, and visibility of your website across the diverse ways people experience the web.