What is WCAG Contrast Checker and what is it used for?

WCAG Contrast Checker is a free online utility from MarkVibe that lets you handle color tools tasks instantly. Specifically, WCAG Contrast Checker check accessibility contrast ratios so you can move on with your work.

Is WCAG Contrast Checker really 100% free?

Yes — WCAG Contrast Checker is completely free with no sign-up, no credit card, no watermarks, and no daily limit. You can use it as often as you like.

Does WCAG Contrast Checker send my data to a server?

No. WCAG Contrast Checker runs 100% in your browser using client-side JavaScript, so your input never leave your device.

Does WCAG Contrast Checker work on mobile and tablet?

Yes. WCAG Contrast Checker is fully responsive and works on iOS, Android, Windows, macOS, and Linux in any modern browser (Chrome, Firefox, Safari, Edge).

What's the best alternative to WCAG Contrast Checker?

For most users, WCAG Contrast Checker on MarkVibe is the fastest free option because it runs in-browser. If you want similar utilities, scroll to the Related tools section below for more color tools.

WCAG Contrast Checker — Free Online Tool

What is the WCAG Contrast Checker?

The WCAG Contrast Checker is a free online color tools from Markvibe. Check accessibility contrast ratios. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.

Reviewed by The Markvibe Team · Last updated 2026-06-28

Example

A worked example so you know exactly what to expect.

Input

(your input goes here)

Output

(the WCAG Contrast Checker runs in your browser and shows the result instantly)

How to use WCAG Contrast Checker

1Open the WCAG Contrast Checker above — it loads instantly on MarkVibe with no installation or sign-up.
2Paste, type, or upload your input into the WCAG Contrast Checker input area.
3Pick your options to control exactly how WCAG Contrast Checker should check the result.
4Click the action button — WCAG Contrast Checker runs locally in your browser to check the output.
5Copy the result to your clipboard or download it, and share the WCAG Contrast Checker link with anyone who needs it.