WCAG Contrast Checker
Check colour contrast for accessibility — AA/AAA pass-fail with live preview.
#0f172a or the color picker.Tints your text toward black/white until it passes, preserving the rest of your palette.
Ratios use the official WCAG 2.x relative-luminance formula — everything runs in your browser, nothing is uploaded. You've checked ratios. 👁️
Why you’ll love WCAG Contrast Checker
Instant & free
No signup, no paywall, no limits — WCAG Contrast Checker works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Built by developers
Accurate, fast and keyboard-friendly — the details developers care about.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
Frequently asked questions
WCAG Contrast Checker is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Never. Everything is processed locally in your browser — safe for secrets, tokens and proprietary code.
Completely. WCAG Contrast Checker runs entirely in your browser (client-side). Nothing you type, upload or generate is sent to our servers, so your data never leaves your device.
No. It works instantly in any modern web browser — Chrome, Safari, Edge or Firefox — on desktop and mobile.
Yes. The tool is fully responsive and touch-friendly, so it works great on phones and tablets as well as computers.
Global Maple System — a software & AI studio. We built WCAG Contrast Checker (and 200+ other free tools) to show what we can do. Need something custom built? We’d love to help.
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WCAG Contrast Checker is one of 200+ free tools from Global Maple System — a software & AI studio. Need a website, app, AI agent or automation? Let’s talk.