Free tool
Colour contrast checker
Check whether a text/background colour pair meets WCAG 2.1 AA contrast requirements — enter two colours below.
Large sample text
Normal-size sample text for reading
Contrast ratio: 16.37:1
Normal text — AA (4.5:1)Pass
Normal text — AAA (7:1)Pass
Large text — AA (3:1)Pass
Large text — AAA (4.5:1)Pass
UI components / graphics (3:1)Pass
Uses the WCAG 2.1 relative luminance formula (criterion 1.4.3). 'Large text' means 18pt+, or 14pt+ bold.
One colour pair isn't the whole picture
Contrast is one WCAG criterion out of fifty. A free scan checks your actual homepage against all of them.
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