Check foreground and background color contrast for WCAG AA and AAA compliance with suggestions.
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Color Contrast Ratio Checker
Sample Text Preview
21:1
✓ PASS
AA Normal Text
Min: 4.5:1
✓ PASS
AA Large Text
Min: 3:1
✓ PASS
AAA Normal Text
Min: 7:1
More about the Color Contrast Ratio Checker
Knowing a color pairing fails WCAG contrast is only half of what's actually useful, the other half is knowing what to change it to, and a checker that stops at a pass-or-fail verdict leaves picking a replacement color to trial and error rather than offering an actual answer. This tool checks a foreground and background pairing against WCAG AA and AAA thresholds and, when it fails, suggests a specific adjusted color that would pass instead, rather than a verdict alone. Useful for getting a concrete replacement color the moment a current pairing fails AA, choosing between AA and the stricter AAA threshold for a project with a higher accessibility bar, or fixing a failing color pairing directly from the suggestion instead of guessing at a few alternatives by eye.
Check foreground and background color contrast for WCAG AA and AAA compliance with suggestions. The Color Contrast Ratio Checker is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the Color Contrast Ratio Checker?
Open the Color Contrast Ratio 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 Color Contrast Ratio Checker free to use?
Yes. The Color Contrast Ratio 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 Color Contrast Ratio Checker safe and private?
Yes. The Color Contrast Ratio 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 Color Contrast Ratio Checker produce?
The Color Contrast Ratio 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 Color Contrast Ratio Checker work on mobile devices?
Yes. The Color Contrast Ratio 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 Color Contrast Ratio Checker support?
The Color Contrast Ratio 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 Color Contrast Ratio Checker, or do I need to type values?
The Color Contrast Ratio 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 Color Contrast Ratio Checker offline?
Once the page has loaded, the Color Contrast Ratio Checker continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.