You are trying to get accessibility work approved, and someone in the meeting asks what the business gets out of it. A colleague jumps in: “It helps SEO too.” Heads nod. But does accessibility help SEO, or is that a line people repeat because it makes the budget easier to sign?
The honest answer is that some of the work overlaps, some of it does not touch search at all, and a few popular SEO habits actually make sites worse for disabled visitors. This post sorts those three groups so you can make the case accurately and avoid promising something nobody can deliver.
Why the two get lumped together
Search engine crawlers and many assistive technologies have something in common: they read the code and text of a page rather than looking at it the way a sighted mouse user does. A screen reader user often moves through a page by headings or by a list of links. A crawler also relies on headings, link text and text alternatives to understand what a page is about. So when a page is built with clear structure and real text, both benefit.
That shared reliance on structure is real. It is also where the overlap ends. A screen reader user is a person trying to finish a task right now. A crawler is not trying to book an appointment, and it does not get stuck in a pop-up.
Where accessibility and SEO genuinely overlap
Headings that describe the page
WCAG 1.3.1 Info and Relationships and 2.4.6 Headings and Labels ask that headings mark real sections and say what the section is about. That is also what helps a search engine and a skimming reader. The failure is the same in both worlds: headings picked because a size looked nice, or bold paragraphs standing in for headings. If you want the search side of this explained, there is a separate post on how heading levels shape a page for search.
Alt text on images that carry meaning
1.1.1 Non-text Content requires a text alternative for meaningful images. A good alt text describes what the image shows and why it is there: “Technician replacing a water heater in a basement” rather than “IMG_4471”. That text is also what a search engine has to go on for the image. For the steps in the media library, see adding alt text in WordPress.
Link text that says where it goes
Under 2.4.4 Link Purpose (In Context), “click here” and “read more” fail people who pull up a list of links, because every entry sounds the same. Descriptive link text such as “see our water heater repair prices” fixes that, and it also tells a crawler something about the destination page. The same edit serves both.
Captions and transcripts
1.2.2 Captions (Prerecorded) exists for people who are deaf or hard of hearing. A transcript published on the page as ordinary text goes further: anyone can skim it, quote it or search it, and so can a search engine. A video with no text around it gives a crawler very little to work with.
Page language, titles and clean markup
Under 3.1.1 Language of Page, the HTML has to state which language the text is in; without it, a screen reader may guess and pronounce the words using the wrong language rules. A clear, unique page title helps someone with several tabs open and is also what appears in search results. Neither is glamorous, and both are often wrong on older WordPress themes.
Pages that hold up on phones and load without clutter
The Reflow criterion, 1.4.10, is tested at a viewport 320 CSS pixels across: text and controls should stack into one column with no sideways scrolling, much as they would on a narrow phone. A layout that reflows well usually reads well on mobile for everyone. Lean pages help too: a heavy page full of sliders and third-party scripts is slower to use with assistive technology and slower to load in general. If speed is part of your argument, read what Google has said about Core Web Vitals before quoting anything.
Where they pull in different directions
This is the part people leave out of the meeting.
- Keyword-stuffed alt text. “Plumber Dallas plumbing Dallas emergency plumber” is noise for a screen reader user, who has to listen to every word. It does nothing good for search either. Describe the image, once.
- Alt text on decorative images. Some SEO advice says every image needs keywords. For a decorative divider or a background flourish, the accessible choice is an empty alt attribute so screen readers skip it.
- Hidden text. Visually hidden labels written for screen readers, such as a label on an icon-only search button, are legitimate. Hiding paragraphs of keywords off screen is a different thing and does harm to both audiences.
- ARIA as a keyword slot. An aria-label replaces what a screen reader announces. Stuffing it with phrases changes what disabled users hear and helps nobody else.
- Fixes no crawler ever sees. Visible focus, keyboard access, color contrast, target size, error messages that are announced, a modal you can close with Escape. These are some of the most important accessibility fixes, and none of them have anything to do with search.
- Overlays. A toolbar script does not add structure to your content, and it is one more thing loading on every page. Our post on what overlay toolbars really do covers why they are not a fix.
So does accessibility help SEO? What not to promise
Nobody outside a search company can tell you how much, if at all, accessibility work will move your rankings. Be wary of any vendor, including an SEO agency, that says it will. The overlap above is about shared good practice, not a ranking switch.
It is also a weak reason to do the work. The main reason to fix a contact form a keyboard user cannot submit is that a real customer cannot reach you. If a cleaner heading structure helps search along the way, good. Pitching accessibility as an SEO project tends to lead to the work being judged by traffic, and then the invisible fixes, the ones that matter most to disabled users, get cut.
A better pitch for the meeting: accessibility work removes barriers for customers with disabilities, it improves structure and text that every visitor and every search engine reads, and it gives a disabled customer fewer reasons to complain or leave. You can defend every part of that sentence.
A publishing routine that serves both
Most of the overlap lives in content, so it belongs in the routine of whoever publishes pages. Before you press Publish or Update:
- Check that the page has one main heading and that the sections below follow in order without skipping levels.
- Give every meaningful image alt text that describes its purpose. Leave decorative images with empty alt.
- Read your links out of context. Would “learn more” tell you anything? Rewrite it.
- Add captions to new videos, and put a transcript under any audio or talking-head video.
- Write a page title that says what the page is, not just your brand name.
- If you added a table, make sure it has a header row and is used for data, not layout.
- Look at the page on a phone, then zoom the browser in on a laptop and see whether anything breaks or overlaps.
If your team publishes a lot of video or has years of images with no descriptions, that backlog is its own project. Our page on captions, transcripts and alt text at scale explains how it can be worked through.
For the legal side of why businesses take this on at all, see the plain guide to ADA requirements for websites, which is general information, not legal advice. For the rest of the subject, from audits to forms, browse our ADA website accessibility help.
Frequently asked questions
Is accessibility a Google ranking factor?
Nobody outside Google can say exactly how its systems weigh a page, so do not plan on accessibility as a ranking factor. What is clear is that several accessible practices, such as real headings, descriptive link text, alt text and on-page transcripts, give search engines better text and structure to read. Treat that as a side benefit, not the goal.
Should alt text include my keywords?
Only if the keyword is a natural part of describing the image. Alt text exists so someone who cannot see the image knows what it shows and why it is there. A photo of your storefront might honestly mention your business name and street. Repeating phrases a screen reader user must sit through is a barrier, not optimization.
Does accessibility help SEO if I fix only the invisible problems?
Mostly not, and that is fine. Fixes such as visible focus, keyboard access, contrast, target size and announced error messages exist for people, and crawlers do not interact with pages that way. They are often the most important fixes for disabled visitors, so do them for that reason and do not cut them because they do not show up in traffic reports.
Will cleaning up headings for accessibility hurt my rankings?
Turning decorative headings into styled text and putting real headings in order usually makes a page clearer to people and to search engines. If you are worried about a high-traffic page, change it, then watch it in your search tools for a few weeks. Keep the words that describe the topic; only the structure should change.
If you want the barriers on your site found and fixed properly, whatever the effect on traffic, our ADA website compliance support covers the audit against WCAG 2.2 AA, the fixes and a written record of them. Any legal question goes to your lawyer.
Next in this series: Website Accessibility Cost: What Drives the Effort
