The Web Content Accessibility Guidelines (WCAG) 2.1 require a minimum contrast ratio of 4.5:1 for normal text to ensure readability.
Pure black (#000000) on white backgrounds can cause eye strain. Off-black colors like #1a1a1a or #333333 are often preferred for body text.
The quick brown fox jumps over the lazy dog
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Contrast Ratio: 17.1:1
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Contrast Ratio: 15.2:1
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Contrast Ratio: 14.9:1
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Contrast Ratio: 13.7:1
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Contrast Ratio: 12.8:1
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Contrast Ratio: 12.1:1
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Contrast Ratio: 11.0:1
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Contrast Ratio: 10.6:1
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Contrast Ratio: 9.4:1
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Contrast Ratio: 9.3:1
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Contrast Ratio: 8.1:1
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Contrast Ratio: 7.9:1