Short answer: accessibility isn’t a direct Google ranking factor, but the two overlap far more than most people realise.
What Google actually says
Google’s own search advocate has been fairly direct about this over the years: accessibility isn’t something Google measures and uses as a direct ranking signal, mainly because genuine accessibility is hard to measure automatically. But he’s also been clear that accessibility matters for a website because if people can’t use your site, they won’t recommend it, and that user experience, which Google does try to measure, is where accessibility quietly does its work.
Where the overlap actually is
A lot of what WCAG asks you to do is, separately, also good SEO practice. This isn’t a coincidence: both are ultimately about making content clear, well-structured and genuinely usable:
- Alt text. Required for accessibility, and it’s also how Google’s image search understands what an image shows.
- Heading structure. Screen reader users navigate by jumping between headings; Google also uses your heading structure to understand what a page is actually about.
- Descriptive link text. “Read our refund policy” beats “click here” for a screen reader user pulling up a list of links, and it also gives Google far more context than a vague link ever could.
- Captions and transcripts. Essential for Deaf and hard-of-hearing users, and also indexable text that a silent video simply isn’t.
- Page structure and semantic HTML. Helps assistive technology parse your page correctly, and helps search engines do exactly the same thing.
The indirect effect that matters most
Beyond the specific overlaps, there’s a broader signal at play: sites that are slow, confusing, or hard to use tend to have poor engagement metrics (high bounce rates, short visits, few return visits) and those are things search engines do factor in, even if “accessibility” isn’t the label attached to it. An accessible site is very often simply a better-built site, and better-built sites tend to perform better across the board, SEO included.
The honest bottom line
Don’t fix your accessibility purely to chase rankings. That’s the wrong reason, and if Google’s algorithm changes tomorrow, you’d be left with the wrong motivation and no real progress. But if you’re already investing in accessibility for the right reasons, because your users deserve it and because it reduces genuine legal risk, the SEO benefit is a real, welcome side effect, not a myth.
Not sure how accessible your current site is? Start with a website accessibility audit, or see how we work with businesses.
Want both done properly?
Whether you’re fixing an existing site or building a new one, accessible structure fixes the barriers and, as a natural side effect, tends to clean up a lot of what helps search engines understand your content too.