Color Contrast Checker

Check if your color combinations meet WCAG accessibility standards. Test foreground and background colors against AA and AAA requirements. Get real-time pass/fail results and smart adjustment suggestions.

100% Free No Sign Up Privacy First No Upload
The quick brown fox
This is small text sample for contrast testing
14.5:1
Contrast Ratio

AA Normal Text

PASS
Requires 4.5:1

AA Large Text

PASS
Requires 3:1

AAA Normal Text

PASS
Requires 7:1

Adjustment Suggestions

Your color combination meets the highest accessibility standards. Great job!

How to Check Color Contrast in 3 Steps

1

Pick Your Colors

Enter or pick the foreground (text) color and background color using the color pickers or hex input fields.

2

Check Results

View the real-time contrast ratio and see if your colors pass WCAG AA and AAA standards for normal and large text.

3

Improve & Apply

If the ratio is too low, use the suggested adjustments to find compliant colors. Apply the winning combination to your project.

Why Choose HueGrad Contrast Checker?

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Privacy First

All processing happens locally in your browser. Your colors and data never leave your device.

⚡

Lightning Fast

Real-time contrast calculation updates instantly as you type or pick colors. No waiting, no page reloads.

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100% Free

No hidden fees, no subscriptions, no credit card required. Check unlimited color combinations at no cost.

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Unlimited Usage

No limits on the number of color checks or combinations. Use as much as you need for all your projects.

Frequently Asked Questions

A color contrast checker is a tool that calculates the contrast ratio between two colors (foreground and background) and checks if they meet WCAG (Web Content Accessibility Guidelines) accessibility standards. It helps ensure your text is readable for all users, including those with visual impairments.
WCAG AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+ regular). WCAG AAA requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.
Contrast ratio is calculated using the relative luminance of each color, following the WCAG 2.1 formula. The relative luminance is calculated as L = 0.2126 * R + 0.7152 * G + 0.0722 * B, where R, G, B are sRGB values after linearization. The contrast ratio is (L1 + 0.05) / (L2 + 0.05), where L1 is the lighter color and L2 is the darker.
Yes, HueGrad contrast checker is completely free to use. There are no hidden fees, no subscription required, and no sign-up needed. All processing happens locally in your browser.
To improve a low contrast ratio, try darkening the foreground color or lightening the background color (or vice versa). The tool provides suggested adjustments to help you reach WCAG compliance. Typically, making the text darker and the background lighter increases contrast.