What is contrast ratio?

Contrast ratio measures the luminance difference between foreground (e.g., text) and background colors. It ranges from 1:1 (no contrast) to 21:1 (maximum contrast, e.g., black on white). WCAG recommends 4.5:1 for normal text (AA) and 7:1 for enhanced contrast (AAA). Our contrast checker calculates this instantly.

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