Blue Hex Code — #0000FF

RGB, HSL, and CMYK values for Blue.

Last updated: April 6, 2026

Blue Color Values

Format	Value
HEX	#0000FF
RGB	rgb(0, 0, 255)
HSL	hsl(240, 100%, 50%)
CMYK	cmyk(100%, 100%, 0%, 0%)

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About Blue

Color psychology: Trust, loyalty, wisdom.

Blue (#0000FF) is a medium shade of blue with a hue angle of 240° on the color wheel, 100% saturation, and 50% lightness. It's commonly used in web design, graphic design, and branding where trust, loyalty, wisdom are desired associations.

In color theory, Blue sits in the cool section of the spectrum. Its high saturation makes it vivid and attention-grabbing — ideal for CTAs, headings, and brand accents.

When to Use Blue in Design

Web Design

Use Blue for headings, links, or accent elements against light backgrounds. Dark colors like this provide strong contrast and draw the eye to important content.

Branding & Logo

Blue conveys trust, loyalty, wisdom — consider it for brands that want to project these qualities. Test it at small sizes (favicon, social avatar) to ensure it remains recognizable.

Print Design

Use the CMYK values (C:100% M:100% Y:0% K:0%) for accurate print reproduction in brochures, business cards, and packaging. Request a physical proof — screen colors often appear more vibrant than their printed equivalents.

UI / UX Design

Dark colors like Blue are effective for primary buttons, navigation bars, and text. Use a lighter tint (increase HSL lightness to 90%+) for hover backgrounds.

How to Use Blue in CSS

/* Using HEX */
color: #0000FF;
background-color: #0000FF;

/* Using RGB */
color: rgb(0, 0, 255);

/* Using HSL — best for creating variations */
color: hsl(240, 100%, 50%);

/* Transparent overlay (50% opacity) */
background-color: rgba(0, 0, 255, 0.5);

/* Lighter variant for hover states */
background-color: hsl(240, 100%, 60%);

/* Darker variant for active states */
background-color: hsl(240, 100%, 40%);

HSL is the most flexible format for creating color systems. By adjusting the lightness value, you can generate an entire shade scale from Blue without changing its core hue or saturation.

Colors That Go With Blue

Complementary

Analogous

Triadic

Similar Shades of Blue

Navy Blue

#000080

Dark Blue

#00008B

Medium Blue

#0000CD

Midnight Blue

#191970

Periwinkle

#CCCCFF

Neon Blue

#4D4DFF

Frequently Asked Questions

What is the hex code for Blue?

The hex color code for Blue is #0000FF. In CSS, apply it as text color with color: #0000FF;, as a background with background-color: #0000FF;, or as a border with border-color: #0000FF;. Hex is the most widely used color notation on the web because it is compact, supported by every browser, and easy to copy between design tools like Figma, Photoshop, and code editors.

What is Blue in RGB and when should I use RGB?

Blue in RGB is rgb(0, 0, 255), where Red=0, Green=0, and Blue=255 on a 0-255 scale. Use RGB when you need transparency — rgba(0, 0, 255, 0.5) creates a 50% transparent version. RGB is also the native format for HTML canvas, WebGL, and JavaScript image manipulation, since each channel represents the intensity of that primary light color on screen displays.

How to use Blue in CSS with different color formats?

Blue can be applied in CSS using multiple formats: (1) Hex: color: #0000FF; — most compact and widely used. (2) RGB: color: rgb(0, 0, 255); — useful when calculating colors dynamically in JavaScript. (3) HSL: color: hsl(240, 100%, 50%); — best for creating variations, since adjusting lightness produces lighter or darker shades while keeping the same hue. (4) With transparency: rgba(0, 0, 255, 0.8); or hsla(240, 100%, 50%, 0.8); for 80% opacity overlays.

What is the HSL value of Blue and why is HSL useful for designers?

Blue in HSL is hsl(240, 100%, 50%). HSL stands for Hue (240 degrees on the color wheel), Saturation (100% color intensity), and Lightness (50% brightness). HSL is the most intuitive format for designers because you can create harmonious palettes by rotating the hue, generate hover effects by increasing lightness by 10%, and desaturate colors by reducing the S value. This makes Blue a medium, vivid cool-toned color.

What is the CMYK value of Blue for print design?

Blue in CMYK is C:100% M:100% Y:0% K:0%. CMYK (Cyan, Magenta, Yellow, Key/Black) is the standard color model for professional printing — business cards, brochures, merchandise, and packaging. When designing for print in Adobe InDesign or Illustrator, use these exact CMYK values to ensure accurate color reproduction. Screen colors (RGB) often appear more vibrant than their printed CMYK equivalents, so always request a physical proof for brand-critical materials.

What colors pair well with Blue in design projects?

Blue is the most universally liked color and pairs with almost anything. Use light blue backgrounds with dark text for calm interfaces, or pair navy with white for a professional, trustworthy look.

Is Blue (#0000FF) accessible for web design and WCAG compliant?

Blue-on-white is one of the safer combinations for color-blind users, but ensure the shade is dark enough (below #1565C0) for WCAG AA text compliance at the standard 4.5:1 ratio. For Blue specifically: as a medium shade (lightness: 50%), it can work as a text color on light backgrounds, but verify the exact contrast ratio using a contrast checker tool. WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+ regular).

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Written by

Tamanna Tasnim

Senior Full Stack Developer

ToolsContainerDhaka, Bangladesh5+ years experiencetasnim@toolscontainer.com www.toolscontainer.com

Full-stack developer with deep expertise in data formats, APIs, and developer tooling. Writes in-depth technical comparisons and conversion guides backed by hands-on engineering experience across modern web stacks.

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