Web accessibility means your site works for everyone — including people who use screen readers, keyboard navigation, or need high contrast text. Accessibility is not just the right thing to do — many of the fixes directly improve your SEO, and in the UK the Equality Act 2010 requires reasonable adjustments for disabled users. This guide assumes no prior knowledge — every term is explained as it comes up.
♿ Check Accessibility All Performance Tools →Web accessibility means designing and building websites that people with disabilities can use. This includes people who are blind or visually impaired (using screen readers — software that reads page content aloud), deaf or hard of hearing (affecting how they experience video or audio content), have motor difficulties (using keyboard navigation instead of a mouse, because precise clicking can be difficult), or have cognitive disabilities (where cluttered layouts, flashing content, or unclear language create genuine barriers to understanding). In the UK, approximately 1 in 5 people have some form of disability — this isn't a small edge case, it's a substantial portion of your potential visitors.
A screen reader works by converting on-screen text and structure into speech or braille output. It can only describe what's actually present in your HTML — if an image has no description attached, the screen reader has nothing to say about it beyond "image", leaving a blind visitor with no idea what they're missing. This is why the technical fixes in this guide matter so much: they're not cosmetic, they're the literal difference between a page being usable or not for a real visitor.
WCAG stands for Web Content Accessibility Guidelines — the internationally recognised standard for accessibility, published by the W3C (the organisation that maintains core web standards generally). Each individual rule within WCAG has a reference number like "1.1.1" and a level — A, AA, or AAA — indicating how essential it is. Level A covers the most fundamental requirements; almost any genuinely inaccessible site is failing Level A rules. Level AA is the level most organisations target, and the level required by UK law for public sector sites. Level AAA is the most stringent and is rarely required outside specialist contexts. When you see "WCAG 2.1 AA" mentioned, it simply means "the standard, mid-tier, widely-expected level of accessibility compliance."
Every image that conveys information needs an alt attribute — a short text description embedded directly in the HTML, invisible to sighted visitors but read aloud by screen readers. Screen readers read the alt text aloud. Google also uses it to index and understand images, since it can't "see" a picture the way a person can — it relies on the alt text to know what's depicted. Fix: add alt="description of what the image shows" to every img tag. Decorative images — a background flourish or divider that conveys no actual information — should have alt="" (empty, not missing entirely) so screen readers skip them silently instead of reading out something unhelpful like the filename.
Every form input needs an associated label element — a piece of text explicitly tied to that specific field, so a screen reader can announce "Email address, edit text" rather than just "edit text" with no context. Placeholder text (the greyed-out hint text shown inside an empty field) is not a substitute — it disappears the moment the user starts typing, and many screen readers don't reliably announce it at all. Fix: add <label for="input-id">Field name</label> before each input, matching the input's id attribute exactly so the browser knows they're linked.
Text must have sufficient contrast against its background to be readable — this affects not just visually impaired users, but anyone using a phone outdoors in bright sunlight, or anyone with mild age-related vision changes, which is a much larger group than "accessibility" might initially suggest. Light grey text on a white background is a classic failure: it might look stylish on a designer's monitor but becomes genuinely unreadable for a meaningful chunk of real visitors. "Contrast ratio" is a precise mathematical measurement comparing the brightness of text against its background; WCAG AA requires a minimum ratio of 4.5:1 for normal text, or 3:1 for large text. Fix: use the Accessibility Checker to find failing elements — it shows you the exact ratio for each one — then darken the text colour until it passes.
Keyboard users (people who can't use a mouse reliably, or choose not to) navigate a page by pressing Tab repeatedly to move between interactive elements one at a time. Without a "skip link", every single visit to every page means tabbing through the entire navigation menu — sometimes dozens of links — before even reaching the actual page content, every single time. Fix: add <a href="#main-content" class="skip-link">Skip to main content</a> as the very first element in your HTML, designed to become visible only when a keyboard user tabs to it, letting them jump straight past the repeated navigation.
Screen reader users frequently navigate a page by jumping between headings rather than reading top-to-bottom — similar to how a sighted user skims a page visually. This only works if your headings follow a logical order: one H1 per page (the main title), then H2s for major sections, H3s nested within those, and so on, without skipping levels purely for visual styling reasons. Fix: review your page's heading structure and make sure it reflects the actual content hierarchy, not just whichever font size happened to look right.
Text like "Click here" or "Read more" tells a screen reader user nothing when they're navigating by jumping between links, out of context from the surrounding sentence — they might hear a list of ten identical "Click here" links with no way to tell them apart. Fix: write link and button text that makes sense on its own, such as "Download the 2026 pricing guide" rather than "Click here".
Run the Accessibility Checker and get actionable results in minutes. Pay as you go — no subscription needed.
Check Accessibility →No — prioritise Level A issues first (the most fundamental barriers), then Level AA. Within that, fixes affecting the most pages or the most commonly used features (like your main navigation or checkout flow) matter more than an issue buried on a rarely-visited page.
Most fixes are invisible to sighted visitors — alt text, labels and heading structure live in the HTML, not the visual design. Colour contrast fixes may require minor colour adjustments, but these can usually be made subtly enough not to disrupt your existing visual brand.
Third-party accessibility overlay widgets are widely considered an inadequate substitute by accessibility experts and disabled users themselves — they often fail to fix the underlying HTML issues and can sometimes make a site harder to use. Genuine fixes to your actual code are more reliable and, in several documented legal cases, overlays alone haven't been accepted as sufficient compliance.
aiwebpageseo.com is a data-driven SEO and AEO (Answer Engine Optimisation) platform providing a free suite of technical website tools. Rather than relying on AI-theorised assumptions, the platform analyses live URL performance, delivering objective diagnostics, page speed metrics, CLS debugging, and site crawl data alongside actionable technical tutorials.