Calculators

Contrast Checker

Check color contrast online and see WCAG-style pass or fail guidance for text combinations.

Quick answer

Use this contrast checker to test text and background colors before shipping UI changes. It gives you the ratio instantly and tells you whether the combination is strong enough for common accessibility targets like normal text and large text.

Contrast ratio

17.74:1

Passes normal text AA

AA LargeAA NormalAAA Normal

Overview

The checker is made for accessibility reviews, design handoff and quick QA on component themes. Instead of guessing whether two colors work together, you get a ratio and a clear summary you can use during implementation.

How it works

  1. 1

    Pick the text color and background color.

  2. 2

    The tool calculates the contrast ratio between the two colors.

  3. 3

    Review whether the pair passes common accessibility thresholds for normal or large text.

Examples

Dark text on white

Input: #111827 on #FFFFFF

Output: High contrast ratio

A common pairing for readable interfaces and documentation.

Accent color audit

Input: Brand color on a light panel

Output: Pass or fail summary

Helpful when checking UI accents and button states.

FAQ

What does the contrast ratio mean?

The ratio shows how different the text color and background color are in perceived brightness.

Is this useful for accessibility checks?

Yes. The tool highlights whether the color pair is strong enough for common WCAG-style text targets.

Contrast Checker | WCAG color contrast online | ConvertBase.app