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The most common web format:
140 predefined colors like
Choose one brand color and build your palette around it using color theory (complementary, analogous, triadic).
WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text. Use our Color Blindness Simulator to check accessibility.
Colors that look great on white might be invisible on dark backgrounds and vice versa.
Convert between HEX, RGB, HSL, and more with a visual picker: Try it ā
Generate harmonious color schemes automatically: Try it ā
Create beautiful gradients with a visual editor: Try it ā
Test your colors for accessibility: Try it āā¢ CSS Gradient Generator ā Create CSS gradients visually
ā¢ Box Shadow Generator ā Design CSS shadows
ā¢ Typography Scale ā Generate font size scales
Free Online Color Picker & Converter ā Complete Guide 2026
Finding the Right Color for Your Project
Color is one of the most powerful tools in design. The right color palette can make or break a website, app, or brand. But working with colors across different formats can be confusing.
Color Formats Explained
HEX Colors
The most common web format:
#3B82F6. Six hexadecimal digits representing red, green, and blue channels.RGB Colors
rgb(59, 130, 246) ā Red, Green, Blue values from 0 to 255. Easy to understand and manipulate.HSL Colors
hsl(217, 91%, 60%) ā Hue (0-360Ā°), Saturation (0-100%), Lightness (0-100%). Most intuitive for designers because you can easily create variations by adjusting lightness.CSS Named Colors
140 predefined colors like
cornflowerblue, tomato, rebeccapurple.Best Practices for Color Selection
1. Start with a Primary Color
Choose one brand color and build your palette around it using color theory (complementary, analogous, triadic).
2. Ensure Contrast
WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text. Use our Color Blindness Simulator to check accessibility.
3. Test in Both Light and Dark Modes
Colors that look great on white might be invisible on dark backgrounds and vice versa.
ToolboxRun's Color Tools
Color Converter
Convert between HEX, RGB, HSL, and more with a visual picker: Try it ā
Color Palette Generator
Generate harmonious color schemes automatically: Try it ā
CSS Gradient Generator
Create beautiful gradients with a visual editor: Try it ā
Color Blindness Simulator
Test your colors for accessibility: Try it ā