Fix Alt Text for A11y, Win at SEO Too

I spend a lot of time telling people to fix their accessibility issues, and I've noticed something useful: the fixes that have the clearest SEO impact are also the easiest sells to teams who care about search rankings but haven't fully bought into accessibility for its own sake. So let me give you the practical version of this argument.

These are real accessibility requirements that are also direct SEO signals. Fix them once, get both benefits.

Alt Text: Two Jobs, One Attribute

Alt text on images exists so that screen reader users can understand what an image shows. That's the accessibility reason. The SEO reason is that image search is a significant source of traffic for a lot of sites, and search engines can only understand what your images show if you tell them.

Descriptive alt text that accurately describes the image content, including relevant keywords where they're natural, does two things: it makes the image accessible to blind users, and it makes it indexable for image search. A product image with alt="red leather wallet with card slots" is more accessible and more likely to surface in image search than one with alt="img_2847.jpg" or no alt text at all.

This one change is genuinely the lowest-effort, highest-combined-impact fix on most sites. If you have a product catalog with hundreds of images, the SEO impact of fixing the alt text scales with the catalog size.

Heading Structure: How Search Engines Find Your H2s

WCAG requires a logical heading structure, meaning headings should reflect the actual hierarchy of your content and you shouldn't skip levels (no jumping from H1 to H4). This matters for screen reader users who navigate by heading to get an overview of the page before reading it in full.

It also matters for search engine featured snippets and "People also ask" boxes. Search engines pull featured snippet content from well-structured pages where they can identify a question (often an H2 or H3) and the answer directly below it. If your content is good but your heading structure is a mess, you're leaving featured snippet opportunities sitting there unclaimed.

The fix: audit your heading hierarchy. Make sure each page has exactly one H1. Make sure H2s are used for major sections. Make sure H3s nest logically under the relevant H2. It takes an afternoon on most sites and the compound benefit over time is real.

Keyboard Navigation: Bounce Rate in Disguise

Users who navigate by keyboard include people with motor disabilities, power users who prefer keyboard shortcuts, and anyone whose mouse has ever died at an inconvenient moment. When your site has keyboard traps (places where focus gets stuck and the user can't move forward) or broken tab order, those users leave.

When users leave quickly, your bounce rate goes up. High bounce rate may send a signal to search engines that users aren't finding what they came for. Search engines are believed to use engagement signals as part of their ranking algorithms. Better keyboard navigation means users can get where they're going, which means lower bounce, which is a ranking signal that works in your favor.

This one is harder to measure in isolation, but the directionality is consistent. Fixing keyboard navigation improves accessibility, reduces abandonment, and improves engagement signals. It's a chain of causation that connects WCAG compliance to search rankings in a fairly direct way.

Page Speed: The One Everyone Already Knows About

Search engines have been explicit about this one since the Page Experience update: Core Web Vitals are a ranking signal. LCP, CLS, and INP can affect where you appear in search results, among many other factors.

What people sometimes miss is the overlap with accessibility. A page with a high CLS score (things jumping around as it loads) is both a poor page experience for everyone and specifically problematic for users with cognitive disabilities who find unexpected movement disorienting. A slow LCP means a user with limited data or an older device waits longer to see your content. Performance improvements are accessibility improvements, and vice versa.

The practical upshot is that when you're working on Core Web Vitals for SEO reasons, you're also improving the experience for users who depend on assistive technology or who access your site under constrained conditions. The work counts twice.

The Two Birds Approach

You don't need to run two separate initiatives: one for accessibility and one for SEO. For most of the high-impact, easy-to-fix items, they're the same work. Fix the alt text. Clean up the headings. Fix the keyboard flow. Improve the load time. Each of these goes on a single to-do list and produces results in both areas.

The practical starting point is knowing what you currently have. SCOUTb2 scans for many of the issues discussed above: missing alt text, heading hierarchy problems, keyboard navigation issues, and Core Web Vitals. You get a list of specific potential issues to investigate, not just a vague "accessibility score." If your site has more pages than you can reasonably scan one at a time, the Pro plan covers up to 10,000 pages per scan to help give you a broader picture across your site.

One list of fixes. Two sets of potential wins. It's about as close to a free lunch as web development gets.

Disclaimer: This article is for informational purposes only and does not constitute legal, professional, or compliance advice. SCOUTb2 is an automated scanning tool that helps identify common issues but does not guarantee full compliance with any standard or regulation.