#FF0400 Hex Color
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#ff0400 is a loud, fully saturated red that grabs attention before anything else on the page. That intensity suits small accents: buttons, sale badges, alerts, calls to action. Full backgrounds overwhelm fast, so treat it as the 10% in your palette. It flatters deep navy and charcoal, and black text on #ff0400 reaches about 5.3:1 contrast, passing WCAG AA for body text.
Questions about #ff0400
What is #ff0400 in RGB, HSL and CMYK?
In RGB, #ff0400 is rgb(255, 4, 0), in HSL hsl(1, 100%, 50%) and in CMYK 0%, 98%, 100%, 0%.
What colors pair well with #ff0400?
Is #ff0400 readable on white or black?
#ff0400 has a 3.98:1 contrast ratio on white and 5.26:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it works only for large text (24px, or 18.5px bold) and on black it works for body text. Try other pairs in the contrast checker.