Blue Color (#0000FF)
Blue is a CSS named color defined as hex code #0000FF. Blue is the pure blue of the sRGB screen: the blue channel at full strength with nothing else. It is very saturated but surprisingly dark, so white text has strong contrast on it while black text does not.
Color Overview & Formats
blueLuminance: 0.0722| Format | Syntax / Values | Notes | Action |
|---|---|---|---|
| HEX | #0000FF | 6-digit hex web code | |
| RGB | rgb(0, 0, 255) | Red, Green, Blue channels (0-255) | |
| HSL | hsl(240, 100%, 50%) | Hue (240°), Saturation (100%), Lightness (50%) | |
| HSV / HSB | hsv(240, 100%, 100%) | Hue, Saturation (100%), Value/Brightness (100%) | |
| CMYK | cmyk(100%, 100%, 0%, 0%) | Digital mathematical approximation (non-print) | |
| OKLCH | oklch(0.452 0.313 264.1) | Perceptually uniform color space (CSS Color 4 approximation) |
background-color: #0000FF; /* or blue */- Select color format: Choose the desired format (HEX #0000FF, RGB, or HSL).
- Copy the code: Click the copy button or press Tab+Enter to store in clipboard.
- Pair with white text: White text on Blue reaches 8.59:1 (WCAG AAA).
What Colors Go With Blue?
These 6 colors all go well with Blue (#0000FF), and each one is a standard CSS named color. The ratio is the WCAG 2.2 contrast of that color on Blue: at 4.5:1 or above it works for text; below that, use it for backgrounds and accents.
Harmonious Palettes & Tints
The palettes below are algorithmically generated across standard intervals based on Blue (HSL 240°). Each group offers full palette copy and live preview:
Complementary Harmony
Hue rotated 180 degrees on the HSL wheel (240° to 60°), keeping the original saturation and lightness.
Analogous Harmony
Hues 30 degrees either side (210° and 270°), keeping the original saturation and lightness.
Triadic Harmony
Hues spaced evenly by 120 degrees (0° and 120°), keeping the original saturation and lightness.
Tints & Shades
Mixed with white (tints) and black (shades) in sRGB at 60% and 30%.
WCAG 2.2 Text Readability & Contrast Check
Under WCAG 2.2 criteria, regular body text requires at least 4.5:1 (AA) and large text requires at least 3.0:1. The table below displays calculated contrast ratios:
| Foreground Color | Contrast Ratio | Normal Text (AA) | Large Text (AA) | Normal Text AAA (>= 7.0:1) |
|---|---|---|---|---|
Pure Black (#000000) | 2.44:1 | Fail | Fail | Fail |
Pure White (#FFFFFF) | 8.59:1 | Pass | Pass | Pass |
Dark Charcoal (#212529) | 1.80:1 | Fail | Fail | Fail |
Mid Gray (#666666) | 1.50:1 | Fail | Fail | Fail |
Interactive Contrast Tester
Enter text foreground and background colors to verify WCAG legibility:
This is sample body text rendered directly to verify contrast and readability.
Blue Background Download
Download standard 1920x1080 solid desktop wallpaper or generate mobile wallpaper:
Standard Wallpaper: 1920x1080 PNG (#0000FF)Download Options
All wallpaper files precisely match the W3C standard color value:
CSS Standard & Usage Notes
blue = #0000ff (rgb(0, 0, 255))
UI Design & Accessibility Guidelines
Use it for links, primary buttons and strong accents; it is too intense for large backgrounds. On Blue, white text passes WCAG AAA at every size (8.59:1); black text fails even for large text (2.44:1).
Frequently Asked Questions (FAQ)
Can I use black text on Blue?
No. Black text on Blue has a WCAG 2.2 contrast ratio of only 2.44:1, below the 3:1 minimum even for large text.
Can I use white text on Blue?
Yes. White text on Blue has a WCAG 2.2 contrast ratio of 8.59:1, passing both AA (4.5:1) and AAA (7:1) at every text size.
What colors go with Blue?
White, Ivory, Yellow, Gold, Light Gray and Orange all go well with Blue. White (8.59:1), Ivory (8.52:1), Yellow (8:1), Gold (6.13:1) and Light Gray (5.74:1) have enough contrast for text on Blue; Orange works better as a background or accent.
What is the hex code for blue?
The CSS named color blue is #0000FF, which is RGB(0, 0, 255). The short form #00F is the same color.