Free Contrast Checker
Knowing your colors fail an accessibility check is only half the battle — fixing them is the other half. NToolHub's contrast checker not only tests your text and background colors against WCAG standards, it offers a one-click suggestion for an accessible text color when your pairing falls short, plus a swap button to test the reverse combination. It is the fastest path from 'this fails' to 'this ships'.
Body text rendered with your chosen colors to preview readability.
How to Use the Contrast Checker
- Pick a text color and a background color.
- Read the contrast results in the panel below the preview.
- If it fails, hit Suggest accessible text color for a one-click fix.
- Use ⇄ Swap to test the reverse pairing instantly.
Features
Beyond the standard contrast ratio and AA/AAA verdicts, this checker includes an intelligent suggestion engine: one click proposes a text color that passes against your background while staying close to your original choice. A swap button flips foreground and background for quick reverse testing. The live preview renders a heading and body copy in your exact colors.
Benefits & Use Cases
Designers rescue failing color schemes without starting over. Developers fix accessibility audit findings in seconds during a sprint. Dark-mode builders tune text colors that stay readable on deep backgrounds. Marketing teams validate button text colors before a campaign launch.
Tips
The suggested color keeps your original hue's character while adjusting lightness to pass — accept it, then fine-tune. Always re-check after swapping: a pair that passes one direction usually passes the other, but the suggestion engine optimizes per direction. Test both normal and large text verdicts, since headings get more leeway.
Frequently Asked Questions
How is this different from a contrast ratio calculator?
This checker goes further: it gives AA/AAA verdicts, a live preview, and — uniquely — one-click suggestions for an accessible replacement color when yours fails.
How does the "suggest accessible text color" feature work?
It analyzes your background color and proposes a text color that meets WCAG contrast requirements while staying visually close to your original choice.
What does the swap button do?
It instantly exchanges your text and background colors so you can test the reverse pairing without re-picking anything.
Does it check both AA and AAA?
Yes. You get verdicts for WCAG AA and AAA across normal and large text sizes.
Is the contrast checker free?
Yes. It is completely free with no sign-up, and everything runs in your browser.
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