Web Accessibility Basics: Making Your Website Work for Everyone

Imagine turning away one in six potential customers at the door. No business would do that on purpose, yet that's roughly what an inaccessible website does. Around a billion people worldwide live with some form of disability, and many more browse in conditions — bright sunlight, a noisy room, a slow connection, an injured hand — that make a poorly built site hard to use. Web accessibility is simply about making sure your website works for all of them.

It's often misunderstood as a niche technical obligation. In reality it's good design that happens to help everyone, it widens your customer base, and it tends to improve your search visibility as a bonus. Here's what accessibility means in plain terms and how to get the basics right.

1 in 6
people worldwide live with some form of disability. An inaccessible website quietly turns them away — and the same fixes make the experience better for everyone else, too.

What web accessibility actually means

Web accessibility means designing your site so that people with a range of abilities can perceive, understand, navigate and interact with it. That includes people who are blind or have low vision and use screen readers, people who can't use a mouse and navigate by keyboard, people who are deaf or hard of hearing, people with cognitive differences, and people with motor impairments. The internationally recognised standard is the Web Content Accessibility Guidelines, maintained by the W3C's Web Accessibility Initiative, and they're built on four simple principles.

The four principles of accessible design (WCAG)
Principle In plain terms
Perceivable People can see or hear your content (e.g. image descriptions, captions).
Operable People can use it however they navigate (mouse, keyboard, touch).
Understandable Content and controls are clear and predictable.
Robust It works with assistive technologies and different browsers.
Source: W3C Web Accessibility Initiative (WCAG).

Why it's worth doing (beyond doing the right thing)

The ethical case is obvious, but there's a hard-headed business case too. Accessibility expands your reach to a large group of customers that inaccessible competitors are quietly excluding. It improves usability for everyone — clear text, good contrast and logical navigation help the harried, the distracted and the small-screen user as much as anyone with a disability. It tends to support your SEO, because many accessibility practices (descriptive text, clear structure, captions) are exactly what search engines reward. And in a growing number of places, a baseline of accessibility is becoming a legal expectation, particularly for larger organisations. Good accessibility is simply good design with a wider definition of “user.”

The basics that make the biggest difference

You don't need to become an expert to make real progress. A handful of practices cover most of the impact.

Describe your images

Add alternative text to meaningful images so screen readers can convey what they show. A blind visitor, or anyone whose image fails to load, then understands what's there. As a bonus, descriptive alt text also helps search engines understand your images.

Use strong colour contrast

Make sure text stands out clearly against its background. Low-contrast text — pale grey on white is a frequent offender — is hard to read for people with low vision and genuinely annoying for everyone in bright light. Good contrast is one of the easiest, highest-impact fixes.

Don't rely on colour alone

If you use colour to convey meaning — red for an error, green for success — pair it with text or an icon. People who are colour-blind can't rely on the colour cue, so the meaning needs another signal.

Make it work by keyboard

Many people navigate without a mouse, using the keyboard alone. Every link, button and form field should be reachable and usable by keyboard, with a visible indicator showing where the focus is. Test it by putting your mouse aside and tabbing through your own site.

Write clear, structured content

Use proper headings to organise pages, plain language over jargon, and descriptive link text (“read our pricing guide,” not “click here”). This helps people using screen readers navigate, and it makes your content easier for everyone to scan — the same clarity that drives conversions.

Caption your videos

If you use video, add captions. They serve people who are deaf or hard of hearing, and also the large number of people who watch with the sound off.

Accessibility and mobile go together

Many accessibility principles overlap neatly with good mobile design. Large, well-spaced tap targets help people with motor impairments and people using a thumb on a phone alike. Readable text at a comfortable size serves low-vision users and small-screen users together. Clear, simple navigation benefits everyone. In practice, building a genuinely mobile-first, responsive site already moves you a long way toward an accessible one. The two disciplines reinforce each other.

How to check your site

Start simple. Try using your own website without a mouse, navigating only by keyboard. View it in bright sunlight to judge contrast. Read it and ask whether the language is clear. Free automated tools can scan your pages and flag common issues like missing image descriptions and poor contrast, giving you a prioritised list to work through. Automated checks won't catch everything — some things need human judgement — but they're an excellent starting point that surfaces the most common problems quickly.

Frequently asked questions

Is web accessibility legally required for my business?+
It depends on where you operate and the size and nature of your business; requirements are expanding in many regions, particularly for larger organisations and public bodies. Even where it isn't strictly mandated, accessibility is increasingly expected — and the business and ethical reasons to do it stand regardless of the legal position.
Will making my site accessible make it look worse?+
No. Accessibility is about clarity, contrast and structure, none of which conflicts with attractive design. In fact, the discipline it imposes — clean layouts, readable text, logical navigation — tends to produce sites that look more professional, not less.
How much does accessibility cost to implement?+
If built in from the start, very little — it's simply part of doing the job well. Retrofitting an existing site costs more depending on its current state, but tackling the high-impact basics (image descriptions, contrast, keyboard navigation) delivers most of the benefit for modest effort.
Does accessibility really help SEO?+
Yes, indirectly but meaningfully. Many accessibility practices — descriptive text, clear headings, captions, logical structure — are exactly the signals search engines use to understand and rank content. Accessible sites tend to be well-structured sites, and search rewards that.

The bottom line

Web accessibility isn't a niche technical box to tick; it's about making your website work for the full range of real people who visit it. Get the basics right — describe images, use strong contrast, don't rely on colour alone, support keyboard navigation, write clearly, caption videos — and you widen your reach, improve the experience for everyone, support your search visibility, and do the right thing all at once. Build it in from the start where you can, fix the high-impact basics where you can't, and treat “works for everyone” as the standard rather than the exception.

If you'd like your site reviewed and improved for accessibility, you can explore how a custom web design service approaches it or get in touch.

References

  1. W3C Web Accessibility Initiative. “Introduction to Web Accessibility” (WCAG). w3.org/WAI.
  2. Google / web.dev. “Web Vitals.” web.dev.
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