---
title: "WCAG Color Contrast Checker (AA & AAA Standards) — Nexvert"
description: "Verify accessibility compliance between foreground text and background colors according to WCAG 2.1 AA and AAA standards."
url: https://nexvert.online/contrast-checker/
---

# WCAG Color Contrast Checker (AA & AAA Standards)

Verify accessibility compliance between foreground text and background colors according to WCAG 2.1 AA and AAA standards.

## What is WCAG Color Contrast Checker (AA & AAA Standards)?

The Contrast Checker calculates the contrast ratio between a text colour and a background colour using the WCAG 2.1 formula and shows whether it passes AA and AAA for normal and large text. For example, white text on #dc2626 red scores about 4.8:1, which passes AA for normal text but not AAA. A live preview shows real text and a button in your colours, and Swap reverses foreground and background.

## How to use WCAG Color Contrast Checker (AA & AAA Standards)

1. **Set the text colour** — Pick or type the foreground colour.
2. **Set the background colour** — Pick or type the background colour.
3. **Read the result** — See the ratio and AA/AAA pass or fail for normal and large text.

## Frequently asked questions

### What contrast ratio do I need?

WCAG AA requires 4.5:1 for normal text and 3:1 for large text (24 px, or 18.66 px bold). AAA requires 7:1 and 4.5:1.

### Does contrast affect SEO?

Not directly, but accessible, readable pages keep visitors longer and are required by accessibility laws in many countries.

### Does it support transparent colours?

Enter the final visible colour; transparency must be blended with the background first.

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Source: https://nexvert.online/contrast-checker/
HTML version: https://nexvert.online/contrast-checker/