Color Contrast Checker
Verify WCAG 2.1 AA and AAA compliance for normal text, large text, and UI components in real time.
How It Works
Test contrast ratios between foreground and background colors according to official W3C WCAG 2.1 algorithms. Features live typography and button previews with contrast fix suggestions.
Privacy & Processing
Runs locally in your browser · No upload required. Unlike ad-supported directories, there are no third-party trackers, promotional popups, or artificial download delays.
Frequently Asked Questions
How does Color Contrast Checker process my data?
This utility executes 100% locally in your browser memory via client-side JavaScript and WebAssembly. No files, calculations, or raw inputs are uploaded to external servers.
Are there usage limits or account registration required?
No account or paid subscription is required. All production tools are accessible directly with zero mandatory registration or artificial delays.
Does Color Contrast Checker produce official scoring or ranking guarantees?
Diagnostic and analytical tools provide objective technical measurements and recommendations based on documented web standards. Diagnostic scores do not predict search engine rankings or guarantee business outcomes.
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