Color Contrast Checker

What is Color Contrast Checker?

Verify that your foreground and background color combinations meet WCAG AA and AAA accessibility guidelines for readability.

This tool instantly analyzes any hex, RGB, or HSL color pair to compute the contrast ratio and determine compliance levels, making it indispensable for web designers, UI/UX developers, digital content creators, and quality assurance testers who need to ensure their interfaces are accessible to users with visual impairments including low vision and color blindness.

Whether you are designing a new website, reviewing a mobile app, creating marketing materials, or auditing existing digital products for accessibility standards, this checker delivers immediate, reliable results that help you build inclusive experiences for all users.

Enjoy 100% private, client-side executions. Your source files and parameters are processed completely inside your device RAM, never leaving your sandbox browser configuration.

No color values are sent to any external server, no cloud storage, no cookies, no analytics tracking, and zero data logging — every hex code and RGB value you input exists solely in your current browser tab and is permanently erased the moment you close the page.

This guarantees complete confidentiality for proprietary brand colors, unreleased product designs, sensitive client interfaces, or internal style guides.

You can test hundreds of color combinations without any risk of data interception, unauthorized access, or intellectual property exposure, because absolutely nothing is transmitted over any network at any stage.

How to Use

1. Provide the target values or upload files above. Manually enter foreground and background colors using hex codes (e.g., #FFFFFF), RGB values (e.g., rgb(255,255,255)), or HSL formats. You can also paste multiple color pairs as a comma-separated, space-separated, or line-break delimited list, or upload CSV, TXT, or JSON files for batch testing of extensive color palettes containing dozens or hundreds of combinations. The intelligent parser automatically detects your color format, validates each entry for correctness, and provides clear error feedback for any invalid inputs before analysis begins.
2. Adjust formatting variables, dimensions, or constants if applicable. Set your preferred contrast ratio precision (from 1 to 5 decimal places) to match your reporting needs, choose between WCAG 2.1 or WCAG 2.2 standards, toggle between AA and AAA compliance thresholds, and select output presentation style — including detailed reports with pass/fail indicators, compact summary tables, or annotated key-value pairs showing exact ratio values and recommended font sizes for each compliance level. You can also customize the color picker interface, enable dark mode preview, and save your default settings for future sessions.
3. Review results or click Copy / Download to export outputs. Watch contrast ratios and compliance statuses appear in real-time as you input colors, with intuitive color-coded indicators (green for pass, red for fail) and visual previews showing exactly how your text will appear against the background. Use the one-click Copy button to grab formatted results to your clipboard for quick insertion into accessibility reports, design documentation, emails, or project management tools, or hit Download to export your complete analysis as CSV, JSON, or plain text — ideal for archiving, sharing with development teams, including in compliance audits, or integrating into larger accessibility workflows. Downloaded files include timestamp metadata, color values, contrast ratios, compliance statuses, and recommended actions for full traceability and professional documentation.

This checker runs entirely offline after the initial page load, requires zero internet connectivity for any analysis operation, and is fully responsive across desktops, laptops, tablets, and smartphones — equally useful in design studios, development sprints, quality assurance testing, or remote accessibility audits.

With its powerful combination of precision, uncompromising privacy, robust batch-processing capabilities, and intuitive interface, Color Contrast Checker is the definitive tool for anyone committed to creating accessible, inclusive, and legally compliant digital experiences.