◑

Contrast Checker — Free Online Tool

Check WCAG accessibility contrast ratios between two colors.

Quick Answer

ZerofyTools Contrast Checker tests the background and foreground colors of your UI against WCAG AA and AAA accessibility standards. It guarantees high-contrast legibility for all digital users.

Found this tool useful?Share it with someone who needs it

How do I use the Contrast Checker?

Check WCAG accessibility contrast ratios between two colors. This tool runs entirely in your browser — your files and data never leave your device. No registration, no watermarks, no limits.

Select your foreground (text) color.

Select your background color.

Review the WCAG accessibility compliance scores.

What are the key features of the Contrast Checker?

✓Live WCAG AA and AAA checking.
✓Large and small text accessibility validation.
✓Visual visualizers for quick validation.

Why use this tool and other frequently asked questions?

What does AA and AAA compliance mean?

WCAG compliance standards ensure that text is clearly legible to users with visual impairments. AA requires a 4.5:1 ratio, and AAA requires 7:1.

Learn more with these guides from the ZerofyTools blog.

Developer Tools10 min read

CSS & Design Tools for Front-End Developers: The Complete Guide

From px-to-rem converters to CSS preprocessors, color generators to SVG optimizers — the complete reference for every front-end CSS tool category, with adoption data from 2024–2025.

May 23, 2026

Developer Tools7 min read

PX to REM & REM to PX: The Complete CSS Conversion Guide (2026)

Convert px to rem and rem to px with the formula, full two-way reference tables (16px, 24px, 1rem, 2rem and more), a rem calculator explainer, and a free in-browser converter.

May 19, 2026

How-to Guide8 min read

How to Check Color Contrast for WCAG Accessibility (Free Online, 2026)

Check if your text colors meet WCAG AA and AAA contrast ratios — free, instant, in your browser. Understand 4.5:1 vs 7:1, fix failing colors, and test for color blindness.

June 14, 2026

You might also need

Check out these other free and highly secure client-side online tools to boost your workflow.

🎨color

Color Picker

Pick any color and get HEX, RGB, HSL values instantly.

🌈color

Gradient Generator

Create beautiful CSS gradients. Export as CSS code or PNG image.

🗜image

Image Compressor

Reduce image file size without visible quality loss. Supports JPG, PNG, WebP.

Contrast Checker Free – Online Tool, No Signup | ZerofyTools