Color #212121 Color / Colour Code #212121
This page shows the hex color code for color #212121 (#212121). The colour is a red tone with 0% saturation and 13% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #212121 against common backgrounds.
Complementary Colors
#212121 paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 330, 0, and 30 degrees for harmonious combinations.
Triadic Palette
Three colors at 0, 120, and 240 degrees.
Color Palettes Using #212121
Five shades at lightness levels 15% through 85% while keeping hue at 0 and saturation at 0%. Use the darkest shade for text and the lightest for backgrounds to build a cohesive single-hue design system.
Adjacent hues from 0 to 45 degrees create a warm, unified palette. This analogous scheme works for marketing materials, seasonal campaigns, and any design that needs visual warmth without clashing colors.
Combines the base color at hue 0 with its complement at 180 and two adjacent cool tones. This split-complementary approach provides strong visual contrast while remaining more balanced than a pure complementary scheme.
Five evenly spaced hues at 40% saturation and 80% lightness. Pastels are gentle on the eyes and work well for dashboards, onboarding screens, category tags, and any interface where multiple distinct colors are needed without visual aggression.
Shades & Tints of #212121
Lightness variations at hue 0 and 0% saturation.
CSS Gradients with #212121
Design Use Cases for #212121
Neutral Foundation Color
#212121 has almost no saturation (0%), making it an excellent neutral. Use it for page backgrounds, card surfaces, divider lines, and any element that should recede visually. Neutrals like this form the foundation of every professional design system.
Dark Mode Background
At just 13% lightness, #212121 works as a dark mode background or overlay color. Dark backgrounds reduce eye strain in low-light environments and make bright accent colors pop. Pair with light text (minimum 4.5:1 contrast ratio) for readability.
Urgency & Energy Signaling
#212121 falls in the red spectrum (hue 0). Red triggers urgency and excitement, making it effective for sale badges, countdown timers, error messages, and "limited time" labels. In data visualization, use it to flag negative values or critical thresholds.
Gradient Pairing
Create a gradient from #212121 (hue 0) to its complement at hue 180. For a subtler effect, try pairing with an analogous color at hue 30. Use CSS: background: linear-gradient(135deg, #212121, #212121);
CSS Code for #212121
Similar Colors
Colors visually similar to #212121 based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #212121 across image editing and color design tools.
About Color #212121 (#212121)
#212121 is a red color (colour) with RGB channel values of 33 red, 33 green, and 33 blue. The red channel is dominant with a relatively balanced channel distribution. In HSL terms, the hue sits at 0 degrees with 0% saturation and 13% lightness, placing it in the warm range of the colour spectrum.
The perceived brightness of #212121 is 33/255 using the ITU-R BT.601 luma formula (0.299R + 0.587G + 0.114B). This appears dark to the human eye, so pair it with light text for adequate readability. For print production, the CMYK equivalent is 0% cyan, 0% magenta, 0% yellow, and 87% key (black).
The WCAG contrast ratio of #212121 against white is 16.10:1 and against black is 1.30:1. This exceeds the AAA requirement (7:1) for normal text on white, making it excellent for body text and small UI labels on light backgrounds.
The complementary colour #212121 creates maximum visual tension when paired with #212121. For more harmonious color combinations, use the analogous colours #212121 and #212121, which sit 30 degrees on either side of the hue wheel. To build a complete design system, start with the monochromatic scale above for consistent shade variations, then add one complementary or triadic accent for interactive elements.
How to Explore Color #212121
- Enter your color value in HEX format.
- The tool converts it to RGB, HSL, CMYK format in real time.
- Copy the converted value to your clipboard.
What is HEX to RGB, HSL, CMYK color conversion
Converting from HEX to RGB, HSL, CMYK translates a color value between two different color models. Different color models are used in web design (HEX, RGB), print (CMYK), and color theory (HSL, HSV).
Related Tools & Colors
Frequently Asked Questions
- What color / colour is #212121?
- #212121 is Color #212121, a red color (colour) with RGB(33, 33, 33), HSL(0, 0%, 13%), and CMYK(0%, 0%, 0%, 87%). Its perceived brightness is 33/255.
- Is #212121 accessible for text?
- Against white, #212121 has a contrast ratio of 16.10:1 (passes AA for normal text). Against black, it has 1.30:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #212121?
- The complementary colour is #212121 (hue 180). For subtle color combinations, use analogous colours #212121 and #212121. The triadic palette adds #212121 and #212121 for vibrant variety.
- How do I use #212121 in CSS?
- Use any format: color: #212121; or rgb(33, 33, 33); or hsl(0, 0%, 13%). For CSS custom properties: --color-primary: 0 0% 13%; then use it as hsl(var(--color-primary)).
- Is this color / colour explorer free?
- Yes, completely free with no signup required. All colour calculations run in your browser. You can explore any valid hex color code, not just the pre-generated palette.