#EF0000 Hex Color
A high-octane red with aggressive energy
#ef0000 is an intense, high-octane red that demands immediate attention. Because of its extreme saturation, it functions best as a small 10% accent rather than a dominant background color. It pairs surprisingly well with charcoal grays or deep navies to anchor its aggressive energy. For accessibility, black text reads clearly against this shade, making it a functional choice for high-contrast alerts or call-to-action buttons.
Questions about #ef0000
What is #ef0000 in RGB, HSL and CMYK?
In RGB, #ef0000 is rgb(239, 0, 0), in HSL hsl(0, 100%, 47%) and in CMYK 0%, 100%, 100%, 6%.
How should I use #ef0000 effectively in a design?
Because #ef0000 is extremely saturated, it functions best as a small 10% accent rather than a dominant background color. It is ideal for high-contrast alerts or call-to-action buttons where you need to draw the eye immediately without overwhelming the viewer.
What colors pair well with #ef0000?
Is #ef0000 readable on white or black?
#ef0000 has a 4.49:1 contrast ratio on white and 4.67:1 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.