Contrast Checker

Check WCAG contrast ratio between any two colors with AA and AAA pass/fail for normal and large text.

Large heading sample
Normal body text sample — the quick brown fox jumps over the lazy dog. 16px regular text is what most WCAG checks target.
Small text sample (14px regular).
14.63
AAA — excellent
AA normal (≥ 4.5)PASS
AA large (≥ 3.0)PASS
AAA normal (≥ 7.0)PASS
AAA large (≥ 4.5)PASS

WCAG 2.1 relative luminance formula, computed live as you adjust colors.

About Contrast Checker

Check WCAG contrast ratio between any two colors with AA and AAA pass/fail for normal and large text.

Contrast Checker is designed to be open-and-go: everything runs in the page with clear on-screen controls, and results appear immediately without any setup.

How to Use Contrast Checker

  1. Open the tool and allow any permission it asks for (only if needed).
  2. Follow the on-screen controls to run the task.
  3. Review the result shown live on the page.
  4. Copy, save or share the output as required.

Key Features

  • No installation or account — just open the page and use it.
  • Clear, guided interface that works on desktop and mobile.
  • Everything runs locally in your browser for privacy and speed.

Frequently Asked Questions

Do I need to install anything for Contrast Checker?

No. Contrast Checker runs entirely in your web browser — there is nothing to download, install or configure.

Is Contrast Checker free to use?

Yes. Contrast Checker is completely free with unlimited use — no account, download or payment required.

Is my data uploaded to a server?

No. Contrast Checker runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.

Does Contrast Checker work on mobile?

Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.

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