WCAG Compliance – Guidelines, Tools, and Steps to Comply

How do you make digital experiences accessible?

Where do you start, and what guidance can you rely on? These are questions many people encounter when they first think about accessibility. Without a clear standard, it can be difficult to know what “accessible” actually means in practice.

The Web Content Accessibility Guidelines (WCAG) provide that guidance. They define a clear, structured framework for building and evaluating websites, applications, and other web-based content so they are accessible to people with disabilities.

In this guide, we’ll break down what WCAG is, how its principles and guidelines work, and what it means in practice to achieve WCAG compliance.

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What Is WCAG?

WCAG stands for Web Content Accessibility Guidelines. It is a technical standard published by the World Wide Web Consortium (W3C) through its Web Accessibility Initiative (WAI). WCAG exists to describe how websites, web applications, and other web content should be built so it works for people with disabilities.

WCAG does not tell you how your site must look, what framework to use, or which tools to buy. Instead, it defines outcomes, known as success criteria, that websites, apps, and web content must meet to be accessible. These outcomes are intentionally technology-agnostic so they can apply across devices, browsers, and assistive technologies.

Importantly, WCAG itself is not enforceable law. You cannot “violate WCAG” in the legal sense. That said, most accessibility laws reference WCAG as the standard used to evaluate whether a digital experience falls short, making it the basis for determining accessibility violations.

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A Note on Terminology: WCAG Conformance vs WCAG Compliance

You may see the term “WCAG compliance” used in this article, even though “WCAG conformance” is the technically correct term. This is intentional. WCAG is a technical standard, and websites formally conform to it; it is not a law that can be complied with.

However, “WCAG compliance” is the term most commonly used by businesses, regulators, and individuals seeking accessibility guidance. To avoid confusion, this article uses “WCAG compliance” as a familiar entry point while referring to WCAG conformance as the correct technical concept.

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How People with Disabilities Actually Use Websites

To really understand WCAG, it helps to step back and think about how people with different disabilities actually use the web.

Blind users rely on screen readers such as NVDA, JAWS, or VoiceOver, which interpret a webpage’s structure and present it as speech or braille. To navigate a page, users move through headings, landmarks, links, and form fields. When that structure is missing or poorly organized, users can lose their place, miss important information, or be unable to complete tasks.

Users with motor disabilities often rely on keyboards, voice control, or switch devices to navigate websites. When interactive elements can’t be reached without a mouse, or it’s unclear where focus is on the page, users can get stuck, lose their place, or be unable to complete tasks like filling out forms, signing in, or making a purchase.

Low-vision users often zoom in on web pages or web apps to make text and controls easier to see. When enlarged, users may need to scroll more and rely on the layout adjusting so that text and controls stay readable and on screen. If zooming causes text to overlap, content to disappear, the website becomes difficult or impossible to use, even if it looks fine at normal size.

The Four Principles of WCAG and Their 13 Guidelines

WCAG is built around four principles, commonly referred to as POUR: Perceivable, Operable, Understandable, and Robust. These principles describe the core requirements that websites, apps, and web content must meet to be accessible to people with disabilities.

Under these principles sit 13 guidelines, which outline the main accessibility goals for web content. Each guideline is further defined by specific, testable requirements known as success criteria. This helps ensure accessibility can be evaluated and improved in a measurable way.

Let’s take a closer look at each of the POUR principles and the guidelines that fall under them, and what they mean in practice.

1. Perceivable

Content must be presented in ways that users can perceive, regardless of their sensory abilities. This means important information should not rely on a single sense alone and must be available in more than one format, so users can access the information in a way that works for them.

Take images, for example. Any information presented in an image should also be available in text. This ensures that users with visual impairments can understand, or rather perceive, the content even when the image cannot be seen.

The Perceivable principle includes the following guidelines:

• Text alternatives: Providing text for non-text content, such as images and icons, so the information can be understood using assistive technologies.
• Time-based media: Ensuring audio and video content includes captions, transcripts, or audio descriptions.
• Adaptable content: Structuring content so it can be presented in different ways, such as simpler layouts, without losing meaning or structure.
• Distinguishable content: Making text and important elements easy to see and hear, including sufficient contrast between foreground and background.

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2. Operable

Users must be able to operate the interface using different input methods, regardless of how they interact with a website. This means functionality should not rely on a single method of interaction and must be usable in ways that work for different users.

An example of this would be ensuring that all interactive elements can be reached and activated using a keyboard. This allows users who cannot use a mouse to navigate the website and complete tasks independently.

The Operable principle includes the following guidelines:

• Keyboard accessibility: Making all functionality available from a keyboard, without requiring mouse-specific actions.
• Enough time: Providing users sufficient time to read content and complete actions, without unnecessary or restrictive time limits.
• Seizures and physical reactions: Avoiding content that could trigger seizures or physical reactions, such as flashing or rapidly moving elements.
• Navigable interfaces: Offering clear ways for users to navigate, find content, and understand where they are on the website.
• Multiple input methods: Supporting different ways of interacting with content, such as touch, voice, or assistive technologies, rather than relying on a single input method.

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3. Understandable

Content and interactions must be easy for users to understand, regardless of their cognitive abilities, and should work clearly and predictably even for first-time visitors. This means information should be presented clearly, and the website should behave in predictable and consistent ways.

For example, form instructions and error messages should clearly explain what is expected and what went wrong, allowing users to correct mistakes without guesswork. Navigation should also remain consistent across the site, so users don’t have to relearn how things work on each page.

The Understandable principle includes the following guidelines:

• Readable content: Making text easy to read and understand by using clear language, logical structure, and appropriate formatting.
• Predictable behavior: Ensuring pages and interface elements behave in consistent and expected ways, so users can easily learn how to interact with the site.
• Input assistance: Providing clear instructions, helpful error messages, and guidance to help users avoid mistakes and recover from them when they occur.

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Robust

Content must be built using standards-compliant code, so it works reliably with current and future assistive technologies. This means the underlying structure of a website should be clear, valid, and interpretable by different browsers and accessibility tools.

Take custom interface elements, for example. These are interface components, such as buttons or menus, that are built from scratch using generic HTML elements instead of native controls. When they lack proper semantics, assistive technologies may not recognize or interact with them correctly, preventing users from accessing key functionality.

The Robust principle includes the following guidelines:

• Compatible markup: Using valid, standards-compliant HTML so content can be reliably interpreted by browsers and assistive technologies.
• Proper semantics: Relying on native HTML elements wherever possible to provide built-in accessibility meaning.
• Careful use of ARIA: Using ARIA attributes only when necessary and correctly, since incorrect ARIA can make interfaces less accessible rather than more.

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What Are the Different WCAG Versions?

WCAG has been updated over time to reflect changes in technology and how people use the web. As of 2026, there are three main WCAG versions:

• WCAG 2.0: Published in 2008, it introduced the original accessibility foundation.
• WCAG 2.1: Published in 2018, it added requirements for mobile use, touch interactions, and cognitive accessibility.
• WCAG 2.2: Published in 2023, it further improves accessibility around keyboard focus, target size, and complex interactions.

All WCAG 2.x versions are designed to be backward compatible. This means that if your website meets WCAG 2.2, it also meets the requirements of WCAG 2.1 and WCAG 2.0. You don’t need to follow each version separately.

Note that all three versions are still valid standards. However, most accessibility laws, such as the Americans with Disabilities Act (ADA) and the European Accessibility Act (EAA), refer to WCAG 2.1. As a result, it is currently the version most widely followed in practice.

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What Are the WCAG Conformance Levels?

WCAG defines three levels of conformance: Level A, Level AA, and Level AAA. These levels represent increasing degrees of accessibility support, with each higher level building on the requirements of the previous one.

Level A is the minimum level of conformance. It addresses basic accessibility barriers, such as text alternatives for images and basic keyboard access. While necessary, Level A alone is rarely sufficient to provide an accessible experience for most users.

Level AA builds on Level A by addressing common accessibility barriers such as color contrast, error identification, focus visibility, and consistent navigation. It balances accessibility with feasibility and is the level most often referenced in laws, audits, and procurement requirements.

Level AAA represents the highest level of accessibility. It includes additional requirements that further improve usability, but many are difficult or unrealistic to meet across an entire website. As a result, full Level AAA conformance is uncommon and not typically expected.

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How to Achieve WCAG Compliance

Achieving WCAG compliance is not a single task or a one-time fix. It is a structured process that combines understanding the guidelines, testing your website, fixing issues correctly, and maintaining accessibility over time.

The steps below outline a practical approach that works for most websites.

Step 1: Identify the WCAG version and level you are targeting

Before you begin, you need a clear target. WCAG conformance is always measured against a specific version and level, such as WCAG 2.1 Level AA.

Without a defined target, it becomes impossible to evaluate whether your website meets the requirements or not. For most public-facing websites, WCAG 2.1 Level AA is the commonly followed baseline, while WCAG 2.2 Level AA is increasingly treated as a best-practice target.

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Step 2: Audit your website for accessibility issues

The next step is to identify where your website does not meet WCAG requirements. This is done through a combination of automated and manual testing.

Automated testing tools can quickly scan pages to flag common issues such as missing text alternatives, insufficient color contrast, missing form labels, or incorrect ARIA usage. These tools are useful for coverage and prioritization, but they only detect a portion of accessibility issues.

Manual testing is essential to uncover problems that tools cannot detect. This includes navigating the site using only a keyboard, testing key pages with a screen reader, checking content at high zoom levels, and reviewing whether instructions, errors, and interactions make sense to real users.

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Step 3: Prioritize issues based on impact

Not all accessibility issues have the same impact. Some issues completely block users from completing tasks, while others cause confusion or friction.

When prioritizing fixes, start with issues related to Level A and Level AA success criteria, as these represent the most fundamental and commonly expected accessibility requirements. Level AAA issues can be addressed later, as they are less critical and often harder to meet consistently.

Focus first on issues that:

• Prevent keyboard navigation
• Block screen reader access to content or functionality
• Make forms unusable or impossible to submit
• Hide content or controls at high zoom levels

Addressing high-impact Level A and Level AA issues first ensures meaningful accessibility improvements early in the process.

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Step 4: Fix the identified accessibility issues

Once issues have been identified and prioritized, the next step is to fix them correctly. This may involve updating content, adjusting design, or fixing the underlying code.

Common fixes include adding missing text alternatives, improving color contrast, correcting focus order, making interactive elements keyboard-accessible, clarifying form instructions and error messages, and ensuring content remains usable at high zoom levels.

When implementing fixes, it’s best to rely on native HTML wherever possible.

Elements such as buttons, links, headings, labels, and form controls provide built-in accessibility support. ARIA should only be used when native elements cannot achieve the required behavior, as incorrect or excessive ARIA can make accessibility worse rather than better.

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Step 5: Re-test after fixes are applied

Accessibility fixes should never be assumed to work without verification. After changes are made, re-test the affected pages using the same methods as before. Re-testing ensures that fixes actually resolve the issue and do not introduce new barriers.

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Step 6: Maintain accessibility over time

WCAG compliance is not permanent. New content, design changes, framework updates, and third-party integrations can all introduce new accessibility issues.

To maintain compliance:

• Adopt accessibility best practices early in design and development.
• Train designers, developers, and content authors on accessibility basics.
• Review new content for accessibility before publishing.
• Test accessibility after major design or code changes.
• Schedule regular accessibility audits.

Accessibility works best when it is treated as part of normal development and content workflows, not as a one-off project.

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Tools to Help Achieve WCAG Compliance

Achieving WCAG compliance manually, page by page, is time-consuming and error-prone. This is where web accessibility tools play an important role. They help identify issues quickly, surface patterns across a site, and guide teams toward fixes that align with WCAG requirements.

One such tool is WebYes Accessibility. With it, you can run an accessibility scan and detect issues across your site. The tool highlights WCAG violations, showing where your website does not meet specific WCAG success criteria and helping you understand what needs to be fixed.

Beyond identifying issues, WebYes provides AI-generated fix suggestions. These suggestions help explain what needs to be changed and why, making it easier to resolve accessibility issues correctly and align with WCAG requirements.

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FAQ