Red color: #ff0000
The CSS keyword red is #ff0000, rgb(255, 0, 0) or hsl(0, 100%, 50%). Its codes to copy, 50–950 tint scale, harmonies and contrast on white and black.
Part of design tools.
About Red
Red is a vivid mid-tone red. Its hue sits at 29° in OKLCH and 0° in HSL — the two wheels are spaced differently, which is why the numbers disagree.
The keyword red is one of the sixteen original HTML 4 colors, the whole palette of CSS 1, so it is understood by every browser and every email client ever shipped.
Red tint scale, 50 to 950
Eleven steps at fixed perceived lightness, in OKLCH, holding red’s own hue from end to end. The keyword itself falls closest to step 500 (#fb0000), the one outlined.
Harmonies built on Red
Hue angles measured in OKLCH, so every accent keeps red’s perceived lightness. Its complement is #019aac, closest to the named color cadetblue.
Complementary
Analogous
Triadic
Split-complementary
Red on white and on black
Black text reads better on red (5.25:1). As a text color it belongs on a dark background: on white it only reaches 3.99:1, under the 4.5:1 that body text needs, while on black it reaches 5.25:1. AA asks 4.5:1 for body text and 3:1 for large text; AAA asks 7:1.
Named colors close to Red
Open red in the full tools
- Open in Color Converter — convert it to any other notation.
- Open in Palette Generator — export its scale as --red-50 … --red-950 tokens.
- Open in Color Harmonies — turn the wheel and compare OKLCH with HSL.
- Open in Contrast Checker — test it against any background, with the closest passing shade.
- Open in Color System Generator — derive a light and dark token set from it.
Or browse every named color from the color converter.