Check color contrast ratios and verify WCAG AA and AAA compliance for accessibility.
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Sample TextThe quick brown fox jumps over the lazy dog.
Contrast Ratio
21.00:1
WCAG Level
AAA
Excellent contrast for all text sizes
More about the WCAG Contrast Checker
Accessibility guidelines don't just recommend readable text, they specify exact numeric thresholds, a 4.5:1 contrast ratio for normal text and 3:1 for large text or UI components at the AA level, stricter still at AAA, and the only way to know whether a specific foreground and background color pair actually clears one of those bars is to calculate the ratio rather than eyeball it. This tool checks the contrast ratio between two colors and states plainly whether that pair passes AA, passes AAA, or fails, against the specific text size it's being used for. Useful for confirming a button's text color actually meets AA contrast against its background before shipping a design, checking whether a light gray caption clears the large-text threshold, or verifying a color pairing meets AAA for a project with a stricter accessibility requirement.
Check color contrast ratios and verify WCAG AA and AAA compliance for accessibility. The WCAG Contrast Checker is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the WCAG Contrast Checker?
Open the WCAG Contrast Checker on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the WCAG Contrast Checker free to use?
Yes. The WCAG Contrast Checker is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the WCAG Contrast Checker safe and private?
Yes. The WCAG Contrast Checker processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
What kind of output does the WCAG Contrast Checker produce?
The WCAG Contrast Checker produces clean, formatted output that you can copy or download with a single click. The output is tailored to the tool's purpose — formatted code, converted data, transformed text, or processed media — and is ready for immediate use in your project or workflow.
Does the WCAG Contrast Checker work on mobile devices?
Yes. The WCAG Contrast Checker is designed to work on any device with a modern browser, including phones and tablets. The interface adapts to smaller screens, and the core functionality — paste input, transform, copy output — works the same way regardless of your device.
What color formats does the WCAG Contrast Checker support?
The WCAG Contrast Checker works with the formats web developers reach for every day - HEX, RGB / RGBA, and HSL. You can copy any value with one click for use in CSS, design tools, or code.
Can I pick a colour visually with the WCAG Contrast Checker, or do I need to type values?
The WCAG Contrast Checker supports both approaches. You can type colour values directly in any format (HEX, RGB, HSL), or click the colour swatch to open your system's native colour picker for visual selection. The tool converts between formats regardless of which input method you use.
Can I use the WCAG Contrast Checker offline?
Once the page has loaded, the WCAG Contrast Checker continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.