Palette Contrast Checker
Check supplied color pairs against WCAG 2 text contrast thresholds.
Processing stays in your browser. Assumes opaque sRGB colors. AA normal text requires 4.5:1 and large text 3:1; actual text size and rendering still matter.
How to use the palette contrast checker
Check supplied color pairs against WCAG 2 text contrast thresholds. Complete the css colors json array fields above, or upload a UTF-8 text file for css colors json array. Choose Run tool, review the output, then copy or download the result.
Example
Black on white has a contrast ratio of 21:1.
Good to know
Assumes opaque sRGB colors. AA normal text requires 4.5:1 and large text 3:1; actual text size and rendering still matter.