Black on white
#000000 on #FFFFFF
21:1 — passes AAA
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Check text contrast against WCAG AA and AAA thresholds.
Quick answer
Measure the contrast ratio between text and background colors against WCAG thresholds.
WCAG contrast
17.85:1
AA normal text: Pass · AA large text: Pass · AAA normal text: Pass
Illustrative view
Relative luminance produces accessibility threshold results.
Measure the contrast ratio between text and background colors against WCAG thresholds.
Relative luminance determines a ratio from 1:1 to 21:1. Normal text needs 4.5:1 for AA and 7:1 for AAA; large text needs 3:1 for AA.
#000000 on #FFFFFF
21:1 — passes AAA
Test brand gray on white
See AA and AAA results
No. Contrast is one requirement; also use readable sizes, clear states, labels, and non-color cues.
Yes. The interface is responsive and works in modern mobile and desktop browsers.
No. This tool runs locally in your browser, so the values or files you provide are not sent to a ToolStack server.
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