Web tool · Free
Accessibility Checker
Find out if your page can be used by everyone — by the WCAG 2.1 standard, in your browser.
What it is
Checks whether a web page can be used by people with disabilities (blind, low-vision, color-blind, keyboard-only users).
Which standard
WCAG 2.1, the W3C standard — the basis of the ADA (US), EN 301 549 (Europe) and many accessibility laws. It detects images without alt, fields without labels, color contrast, heading order, ARIA and link text.
How to use
- 1Open the page you want to test in your browser.
- 2View the source: Ctrl+U (Windows/Linux) or ⌥⌘U (Mac).
- 3Select all (Ctrl+A), copy (Ctrl+C) and paste it into the field below.
- 4Or upload an .html file. Then click Analyze.
Honest limits: External CSS and images do not load here, so the contrast check can be partial. Automated analysis catches most issues but does not replace a manual audit.
Analysis engine: axe-core (Deque Systems), MPL-2.0 license.
Frequently asked questions
Is my HTML sent to a server?
No. The analysis runs 100% in your browser, isolated in a secure sandbox — nothing leaves your device.
Why can contrast be incomplete?
Because external CSS files and images are not loaded here. Colors set directly in the HTML (inline) are analyzed normally.
Does this guarantee 100% compliance?
No. Automated tools catch most issues, but full compliance also requires manual testing with keyboard and screen reader.