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Color Contrast Checker (WCAG) When To Use

Last reviewed: 2026-07-20

Open Color Contrast Checker (WCAG) when you need a quick WCAG contrast check on two colors without installing an accessibility suite or uploading a design file.

When it fits

Checking a button label against its fill before you ship CSS. Comparing body text on a page background from a brand palette. Confirming large heading text still meets AA when the fill is soft. Keeping the HEX values on this device because the math runs in this tab.

What to expect

Pick foreground and background colors; the ratio and AA / AAA pass-fail results update as you change them. Use the live preview to judge readability for normal and large text. Everything runs in the browser - no upload and no account. Ratios use the W3C relative-luminance formula from WCAG 2.1.

For the exact clicks, see the step-by-step guide.

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Last updated: Jul 20, 2026

Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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Color Contrast Checker (WCAG) - Color Contrast Checker (WCAG) - Check the contrast ratio between text and background colors against

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