WCAG Contrast Checker
Ratio + AA/AAA/large-text badges + swap + fix hint.
How to use
Enter Foreground and Background into WCAG Contrast Checker and press Run. DesignMatrix calculates in your browser with a pure JavaScript engine (Web Worker for heavy inputs) ([object Object]). The selected inputs are not sent to a Tolari processing endpoint; output behavior depends on the operation.
Steps
- Use the embedded WCAG Contrast Checker on this page (or open the full tool).
- Enter Foreground and Background.
- Press Run (Ctrl+Enter).
- Copy or download the result, or share a link to this tool.
FAQ
Is WCAG Contrast Checker really free?
Yes. No account or credits are required, and no paywall blocks the task. Browser, device, and stated file-size limits still apply. Ads may appear only when configured and enabled after the required consent signal.
Is anything I type into WCAG Contrast Checker sent to a server?
The calculation runs in this page and is not sent to a Tolari processing server. Depending on your settings, recent runs may be saved in local browser storage; use Private Mode or clear local history on this device if needed.
What should I enter in "Foreground"?
Put your foreground here — for example: #ffffff. Leave the defaults first to see how it works, then adjust. Every field is validated with a plain-language message if something is off.
How should I compare WCAG Contrast Checker with other options?
Compare supported inputs, output quality, file-size limits, browser compatibility, and privacy terms using the same sample. Provider features and terms can change; check their current documentation.
How accurate is WCAG Contrast Checker?
This tool computes in your browser when run. Results depend on the selected inputs, browser support, and the specific operation.
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Compare before choosing
Compare supported inputs, output quality, limits, browser compatibility, and privacy terms before choosing a tool for colors, palettes and CSS generation. Feature checklist.