What Impact Does Web Accessibility Have on SEO?

What Impact Does Web Accessibility Have on SEO?

The short answer is that the two goals point in the same direction. Making a site accessible means clear structure, text for every image, descriptive links, readable pages and content that works on any device. Those are also the things search engines need to understand a page. Published studies find that more accessible sites tend to get more organic traffic and rank for more keywords.

The evidence is a correlation, not proof that accessibility causes higher rankings, and we say so plainly below. Even so, the practical case is strong: most accessibility fixes cost little, help real people, and line up with Google's own SEO guidance.

What the Research Found About Accessibility and SEO

Both studies below were run by Semrush with AccessibilityChecker.org and BuiltWith. AccessibilityChecker.org is a competitor of AccessBell. We did not run these studies. We summarise them and add our own caveats.

2025: 10,000 websites

Semrush's 2025 analysis compared 10,000 websites with their accessibility compliance scores. Sites with higher scores showed:

• About 23% more organic traffic on average
• About 27% more organic keywords ranked
• About 19% higher Authority Score, Semrush's measure of a domain's strength

The same study reported that 70% of the sites failed to meet accessibility standards, which fits what the WebAIM Million found: see our report on the present state of web accessibility in 2026.

2023: 847 sites before and after

An earlier Semrush study looked at 847 websites that had installed accessibility remediation tools. BuiltWith identified when each tool was installed, and Semrush measured organic traffic for three months before and three months after.

• 66.1% of sites grew organic traffic by between 1% and 50%.
• 7.3% grew by more than 50%, so 73.4% grew in total.
• The average change across all sites was a 12% increase in organic traffic.

View both studies as a table

Study	Sites	Finding
Semrush, 2025	10,000	Higher accessibility scores: about 23% more organic traffic, 27% more organic keywords, 19% higher Authority Score
Semrush, 2023	847	73.4% grew organic traffic in the 3 months after remediation; average change +12%

What the Studies Can and Cannot Prove

These are useful signals, and it is worth being clear about their limits:

• Correlation, not causation. Sites that invest in accessibility often improve content, structure and speed at the same time. The studies cannot separate those effects.
• No control group in the 2023 study. Traffic naturally rises and falls with seasons and market changes, and the study compared three months either side of an install.
• Not a ranking-factor test. None of the research shows that Google uses accessibility scores to rank pages, and we are not aware of a Google statement saying it does.
• Averages hide variation. Not every site gained. 26.6% of the 2023 sites did not grow, by our calculation from the published figures.
• A partner with an interest. The studies involved a vendor that sells accessibility tools. That does not make the data wrong, and it is a reason to read it critically.

The fair reading is that accessibility work is unlikely to hurt SEO, has a plausible route to help it, and has independent reasons to do it anyway.

Where Web Accessibility and SEO Overlap

The plausible route is simple: search engines read your pages a bit like assistive technology does. Both rely on text and structure in the code, not on how a page looks. Google's SEO Starter Guide and its image guidance recommend several practices that are also WCAG requirements.

Some accessibility work has no direct SEO effect, such as keyboard access and color contrast. It still improves usability, and better usability tends to keep visitors on the page. Likewise, backlinks and keyword research are pure SEO. The two disciplines overlap, they do not replace each other.

How to Get SEO Benefits From Accessibility Work

1. Start with what both need. Add meaningful alt text, fix heading order, replace "click here" links and give every page a unique title. A free WCAG scan finds missing alt text, empty links and heading problems in seconds.
2. Add text alternatives for media. Caption videos and add transcripts to podcasts. See 1.2.2 Captions (Prerecorded).
3. Fix the errors that hurt everyone. Low contrast text, unlabeled fields and empty buttons are the most common failures on the web, as our 2026 research report shows.
4. Combine audits. When you run an SEO audit, add an accessibility scan. Our SEO audit guide shows what a full site check covers.
5. Test by hand. Tab through the page and try a screen reader. If the page makes sense that way, a crawler can follow it too.
6. Monitor. New content brings new issues. Start a 3-day free trial and AccessBell Pro rescans up to 500 URLs per domain every day.

Frequently Asked Questions

What impact does web accessibility have on SEO?

Studies find a positive link, though not proof of cause. A 2025 Semrush analysis of 10,000 sites found that sites with higher accessibility scores had 23% more organic traffic, ranked for 27% more keywords and had a stronger Authority Score. Many accessibility fixes, such as alt text, headings and descriptive links, are also standard SEO advice.

Is accessibility a Google ranking factor?

None of the research we found shows that Google uses accessibility as a ranking signal, and we are not aware of a Google statement saying it does. What is clear is that Google's own SEO Starter Guide recommends practices that overlap with accessibility, so doing accessibility well usually helps SEO as a side effect.

Does the research prove that accessibility improves rankings?

No. The studies show correlation. Sites that improve accessibility often improve other things at the same time, such as content, structure and speed, and the research cannot separate those effects. Treat the numbers as evidence that the two goals point the same way, not as a guaranteed uplift.

Which accessibility fixes help SEO the most?

The ones that also give search engines clearer text and structure: image alt text, one descriptive H1 with a logical heading order, descriptive link text instead of "click here", unique page titles, captions and transcripts for audio and video, and a mobile-friendly layout that works when zoomed.

Is this AccessBell's own study?

No. We summarise studies published by Semrush, run with AccessibilityChecker.org and BuiltWith. AccessibilityChecker.org is a competitor of AccessBell, so we name it plainly and add our own caveats. The sources are listed at the end.