WCAG Audit

Is your website accessible to everyone? What about people with visual impairments, those who use only the keyboard or a screen reader? If you’re not sure – don’t worry, you’re not alone. Fortunately, WCAG audit comes to the rescue – and it’s best if you do it using the smart tool DiagnoSEO.

1. Why does digital accessibility matter?

Accessibility is more than just a trendy topic. It’s a real need for millions of users – people with disabilities, seniors, mobile device users, or those with slow internet.

From June 28, 2025, the European Accessibility Act will come into force across the European Union, which will require websites such as stores, banks, and public services to comply with WCAG standards. But even without regulations – it’s worth doing. Why?

✅ Because a more accessible website is used by more people
✅ Because you improve SEO and UX
✅ Because you show that you are a socially responsible brand

2. What are WCAG guidelines?

WCAG, or Web Content Accessibility Guidelines, is a set of guidelines developed by the W3C consortium. Their goal is simple: to ensure that everyone – regardless of limitations – can fully use websites.

WCAG is based on four principles (POUR):

• Perceivable – content must be perceivable by the senses
• Operable – it can be operated, e.g., by keyboard
• Understandable – it must be understandable
• Robust – it works on different devices and assistive technologies

Version 2.2 adds for example clearer keyboard focus, larger clickable areas, and easier login.

3. What does a WCAG audit analyze?

A WCAG audit checks whether your website meets dozens of accessibility criteria – usually at levels A and AA. Here are some examples:

• Do images have alternative descriptions (alt)?
• Is the text contrast sufficient?
• Can the user navigate with the keyboard?
• Are headings (h1–h6) used logically?
• Do forms inform about errors?
• Is the focus (highlighting of the active element) visible?
• Does the site work well on mobile and with high magnification?
• Do form fields have autocomplete?
• Is it necessary to solve difficult puzzles (CAPTCHA) to log in?

In short: the audit answers the question whether your website excludes no one.

4. DiagnoSEO tool for WCAG audit

You already know DiagnoSEO as a great SEO analysis tool. Now it has a new module: WCAG 2.2 Audit. What can it do?

• Automatically detects HTML and CSS code errors related to accessibility
• Uses AI to analyze text clarity and labels
• Checks site behavior from the keyboard level (e.g., TAB, ENTER)
• Tests contrast, size of clickable elements, aria attributes, and much more
• Combines WCAG and SEO audit in one report – no need to switch between tools

The result? Full diagnostics of your site, checking if it’s WCAG compliant and user-friendly.

5. Accessibility checklists based on SEO audit

What sets DiagnoSEO apart? Integrated WCAG audit based on SEO data.

Based on a classic SEO audit, the tool checks among others:

• Missing alt for images – missing image descriptions
• Headings Missing h1 tag – missing main heading
• Iframe title Missing – missing iframe frame description
• Contrast issues – too low color contrast
• Empty links – empty links without content
• Lang attribute – no language declaration
• Viewport and scaling – lack of proper responsiveness
• Clickable elements too close – clickable areas too small
• Autocomplete not disabled – fields without autocomplete
• Cookies placement Missing – no information about cookies
• Custom 404 test – no friendly error page
• …and many more

This means that you don’t have to do two separate audits – SEO and WCAG. DiagnoSEO will do it for you in one go.

6. Benefits of using DiagnoSEO WCAG Audit

• 🔎 Automatic detection of accessibility issues
• ✅ Compliance with WCAG 2.1 and 2.2 – levels A and AA
• 👩‍⚖️ Preparedness for EAA 2025 regulations
• 🚀 Better UX and SEO – higher conversions
• 💼 Professional report with checklist and recommendations

7. How to perform a WCAG audit in DiagnoSEO?

1. Go to the DiagnoSEO SEO Audit tool
2. Enter the address of the site you want to check
3. Click “Start” and wait for the audit to finish.
4. You’ll receive a report with results, a checklist, and suggestions for improvements
5. You can export the report to PDF

That’s it – no installation, no coding.

8. The most common accessibility errors (and how to fix them)

• Images without alt → Add alternative text
• Too low contrast → Adjust colors according to WCAG
• No lang → Add lang="pl" or lang="en" in
• No focus → Ensure visible highlighting of active elements
• No error messages in forms → Show what the user did wrong
• Drag & drop without an alternative → Add other ways to interact
• CAPTCHA → Use simpler login methods (e.g., email)

9. WCAG and SEO – a perfect pair

What improves accessibility often improves SEO too. Examples?

• alt helps in Google Images
• Well-described links → better indexing
• Clear heading structure → greater content relevance
• Faster, more responsive site → higher rankings

With DiagnoSEO, you can analyze these same elements simultaneously.

10. Summary

Accessibility is not just a legal obligation – it’s a sign of modernity, care, and professionalism.
With DiagnoSEO you’ll do a WCAG audit in a few clicks, get a precise report, and instantly know what to improve.

Audit your site today and be ready for 2025.

11. Frequently Asked Questions (FAQ)

Do you want to be at the forefront, not just under regulatory pressure?
WCAG audit from DiagnoSEO – your accessibility, your advantage.