Accessibility and SEO: How the same fixes boost your Google rankings

A Google crawler and a screen reader have something in common: neither sees your site. They read the code. When the code is poorly structured, both fail. When it's clean, both understand the page. This technical convergence means an accessibility fix often improves your ranking without extra SEO effort.

Accessibility and SEO: same fight

#The same technical foundations serve accessibility and SEO

Google doesn't "see" your site. Its crawler traverses the DOM, reads the HTML, interprets the tags. A screen reader does exactly the same thing. Both ignore colors, visual layouts, fonts. They read the source code.

"Many good accessibility practices are also good SEO practices; and generally, making a site better for users often has positive indirect effects overall."

John Mueller
Search Advocate, Google (SE Roundtable, June 2022)

The mechanism. When your HTML is well-structured (hierarchical headings, semantic tags, filled-in alt attributes), Google understands the thematic structure of your page. The screen reader lets the user navigate by sections. The same code serves both purposes.

The problem. 94.8% of homepage pages in the top 1 million have automatically detectable WCAG errors, with an average of 51 errors per page in 2025. Out of 20 random sites, 19 have accessibility problems. These same errors slow down indexing and Google's understanding.

The typical scenario. Your SEO team and accessibility team work in silos. Each makes its own correction list. Comparing the two lists, 60% of points overlap. Nobody had seen it.

#Semantic HTML structures content for Google and screen readers

A logical heading hierarchy (H1 then H2 then H3) and semantic tags (nav, main, article, aside) are read by Google to understand thematic structure. Screen readers use them to enable section-by-section navigation.

How it works. A blog post with H1, H2, H3 properly nested: Google understands sub-topics and their relative importance. The screen reader lets the user skip from section to section with a keyboard shortcut. One structuring effort, two benefits.

The common mistake. Skipped headings (H1 then H4) or styled divs instead of real H2s. Google loses thematic structure. The screen reader loses navigation.

Your SEO manager asks you to add H2s with keywords. If you add them in the correct hierarchical order, you serve accessibility too. If you break the hierarchy to fit in a keyword, you degrade both.

<!-- ❌ Broken structure: SEO and accessibility both lose -->
<h1>Accessibility guide</h1>
<div style="font-weight: bold; font-size: 1.5em">Why it matters</div>
<h4>Technical details</h4>
 
<!-- ✅ Correct structure: SEO and accessibility both win -->
<h1>Accessibility guide</h1>
<h2>Why it matters</h2>
<h3>Technical details</h3>

HTML5 semantic tags (nav, main, article, section, footer) give browsers, assistive tools, and search engines a clearer picture of structure. A <nav> says "this is navigation." A <main> says "this is main content." No need for ARIA when native HTML does the job.

#Alternative text makes images visible to Google and understandable for everyone

The alt attribute is the main mechanism by which Google indexes images and screen readers describe them to users. Good alt text serves both. Missing or keyword-stuffed alt text fails on both fronts.

In January 2025, John Mueller shared a Bluesky post reminding us that alt text should be approached from an accessibility perspective, not SEO. The W3C offers a decision tree for choosing the right alt text.

55% of e-commerce sites lack good alternative text on informational images (Baymard Institute, 2021). More than half of online stores have images invisible to Google and screen readers.

The math is simple. Your e-commerce has 5,000 product pages with photos lacking alt text. Each alt added is one image indexable in Google Images and one product accessible. Same work, not double effort.

Your images don't need alternative text

#Transcriptions and captions: invisible content made indexable

A video without transcription is invisible content to Google. The crawler doesn't "watch" videos. It only reads the title and description. The actual content of a 45-minute podcast? Zero indexing without transcription.

It's also inaccessible content for deaf and hard-of-hearing people. Since the EAA came into effect on June 28, 2025, captions are required for covered services.

The double benefit. The transcription creates indexable text that generates long-tail traffic on dozens of queries. Videos with captions generate 7.32% more engagement on YouTube.

Over 70% of social media users watch videos without sound. Captions aren't a bonus. It's the default mode.

The scenario. Your marketing team produces 2 videos per week. Adding captions automatically generates indexable text. The "accessibility" budget becomes an "SEO" budget too.

#Performance and user experience: shared signals

Google measures user experience through Core Web Vitals: LCP (Largest Contentful Paint) under 2.5 seconds, CLS (Cumulative Layout Shift) under 0.1, INP (Interaction to Next Paint) under 200 milliseconds. Many accessibility issues also degrade these metrics.

The classic anti-pattern. An accessibility widget (overlay) that adds heavy JavaScript. LCP degrades. Real accessibility doesn't improve. Double failure.

The real lever. Fixing form labels improves accessibility and reduces mobile bounce rate (click targets too small). Fixing layout stability improves CLS and keyboard navigation.

Core Web Vitals aren't the strongest ranking factor. SEO practitioners agree they act as a "tiebreaker": when two pages have similar content quality, the one offering the better user experience wins. It's a marginal advantage, but a real one.

#What accessibility doesn't improve in SEO

Many articles on this topic promise that accessibility will get you on the first page. It's not that simple.

John Mueller said it clearly in March 2022: accessibility is not "something we would use as a direct ranking factor". Google has no way to quantify a site's accessibility to use it as a ranking signal.

In April 2020, Mueller nuanced it: "I will never [...] when a site is hard to use, people turn away from it anyway; over time, recommendations and other signals decrease, and the site becomes less visible in search results."

The link is real, but indirect.

The reality check. A 100% accessible site with no backlinks and no optimized content won't rank on the first page. Your competitor has a less accessible site but ten times more backlinks and more relevant content. They still beat you. Accessibility helps, but doesn't replace a global SEO strategy.

That's precisely what makes this approach interesting. You're not doing accessibility "for SEO." You're doing accessibility because it's legally required and the right thing to do. The SEO gain is a welcome side effect.

#1.3 billion users your competitors are ignoring

16% of the global population lives with a significant disability. That's 1.3 billion people (WHO, 2023). About 1 in 6.

It's not just a social statistic. The Return on Disability Group estimates the disposable income of people with disabilities at $2.6 trillion (ages 25-64, Canada, EU, UK, US). A market larger than China's disposable income.

Counting their circle (family, friends), the World Economic Forum speaks of $13 trillion in purchasing power.

SEO data confirms the link. A SEMrush study of 10,000 sites (August 2025) shows WCAG-compliant sites have 23% more organic traffic and rank for 27% more keywords. An accessible site attracts an average of a quarter more visitors from Google.

This isn't the first study. In 2023, SEMrush showed on 847 sites that 73% of those that improved accessibility saw organic traffic increase. Out of 10 sites that fix accessibility, 7 see their Google traffic rise.

The regulatory context. The EAA (European Accessibility Act) came into force on June 28, 2025. If your business has over 10 employees or 2 million euros in revenue, you're affected. Your direct competitor has already invested in accessibility. Their traffic is rising. Yours is stagnating. The cause isn't your content. It's your technical foundation.

EAA and web accessibility: what changes for your business in 2026

#Identifying dual-benefit fixes on your site

The first step is finding fixes that serve both objectives at once. A well-done accessibility audit automatically reveals shared SEO blockers.

The 6 dual-benefit fixes. Here are the points that improve both accessibility and SEO when you fix them:

1. Missing alternative text: each alt added makes an image indexable by Google and accessible to screen readers
2. Broken heading hierarchy: logical H1-H2-H3 helps Google understand structure and enables section navigation
3. Missing form labels: proper labels improve completion rate (indirect SEO via engagement) and accessibility
4. Missing lang attribute: tells Google the content language and lets screen readers choose the right voice
5. Missing video transcriptions: create indexable content and make content accessible
6. Degraded performance: a fast site improves Core Web Vitals and experience for all users

The costly mistake. Running SEO and accessibility audits separately by two different vendors without cross-referencing results. Double cost, redundant fixes.

The efficient approach. Scan your web pages with a tool that covers WCAG criteria. Free tools like Lighthouse only detect about 30% of errors. Includdy covers the full workflow: detection, clear explanation of each error, prioritization by impact, fix suggestions with code snippets. One scan identifies accessibility errors that are also SEO blockers.

The concrete workflow:

1. Scan your pages for accessibility errors
2. Sort errors by type: those that also impact SEO go first
3. Fix in batches: alt text, headings, labels, lang, transcriptions
4. Measure impact: Google positions, Core Web Vitals, accessibility score
5. Iterate: new pages must meet the same standards from the start

You get an EAA compliance request. Instead of seeing it as pure cost, you use it to fix SEO blockers at the same time. One budget, two results.

Forgotten Accessibility in Specifications: Who Pays the Bill?

Want to identify accessibility fixes that will also boost your SEO? Test Includdy free: a page scan in 5 seconds reveals errors free tools miss, with fix suggestions for each one.

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