Found a color you love and want to know its hex, RGB, and HSL values?

Pick any color and get all the values you need for design and development.

Color Picker

Visually pick colors and convert between HEX, RGB, HSL, and HWB

Understanding Color Theory and Color Selection

Color is one of the most powerful tools in design. The right color choices can evoke emotions, guide user attention, establish brand identity, and improve readability. Understanding color theory helps designers and developers make intentional decisions rather than relying on guesswork when selecting colors for websites, applications, and digital content.

The Science of Color Perception

Colors are perceived through light wavelengths absorbed and reflected by objects. Screens use additive color mixing with red, green, and blue channels. The human eye has three types of cone cells that respond to different wavelengths, which is why the RGB model maps so naturally to how we see color. Understanding this helps explain why certain color combinations feel harmonious while others clash.

Common Mistakes

✗Picking colors based solely on personal preference without considering accessibility or brand consistency
✗Using too many saturated colors together, which creates visual fatigue and reduces readability
✗Ignoring color contrast ratios — text that looks fine to you may be unreadable for users with color vision deficiencies

Pro Tips

✓Start with a single base color and generate a full palette using HSL lightness and saturation variations
✓Always check WCAG contrast ratios — aim for at least 4.5:1 for normal text and 3:1 for large text
✓Use the 60-30-10 rule: 60% dominant color, 30% secondary, 10% accent for balanced designs

Real-World Examples

Brand palette

Pick a primary brand color, then generate lighter and darker variants for backgrounds, borders, and hover states

Accessible UI

Select a text color and background pair that passes WCAG AA contrast requirements before building your layout

Data visualization

Choose a sequential color scale with consistent lightness steps for charts and graphs to ensure readability

Pick a Color

HEX

RGB

HSL

HWB

Contrast Info

vs White

3.68:1

AA Large

vs Black

5.71:1

AA Pass

Want to learn more?

Color Theory for Digital Design

Read Full Guide

On this page

What is a Color Picker?
Picker vs Converter
Supported Color Formats

About Color Picker

What is a Color Picker?

A color picker is a visual tool that lets you select colors using an interactive interface rather than typing values manually. Unlike a color converter that requires you to know the exact numeric values, a color picker lets you browse the color spectrum visually and grab the exact shade you need. As you pick a color, all the numeric representations update in real time, so you can immediately see the HEX, RGB, HSL, and HWB values for any color you choose.

This Color Picker tool provides a native browser color input for visual selection alongside manual input fields for precise control. It also displays contrast ratio information to help you choose accessible color combinations that meet WCAG guidelines. All processing happens in your browser, and no data is sent to any server.

Color Picker vs Color Converter

KnowKit offers two color tools that serve different purposes. The Color Converter (found at /converters/color) is a text-input tool designed for converting between known color values. You type a HEX code, RGB values, or HSL values, and it converts them to the other formats. It is ideal when you already know the color you are working with and just need to express it in a different format.

This Color Pickeris designed for visual color selection. It includes a native color input that opens your browser's built-in color picker, letting you visually browse and select colors. It also adds HWB format output and WCAG contrast ratio checking, which the converter does not include. Use this tool when you need to explore colors visually or check accessibility.

Supported Color Formats

HEX

A six-digit hexadecimal string prefixed with #, such as #3B82F6. Each pair of digits represents the red, green, and blue channels on a scale of 00 to FF. HEX is the most common color format in web development and is supported by all CSS properties and HTML attributes.

RGB

Expressed as rgb(R, G, B) where each value ranges from 0 to 255. RGB is intuitive because each number directly represents the intensity of its color channel. CSS also supports rgba() for transparency.

HSL

Expressed as hsl(H, S%, L%) where H is the hue angle (0-360), S is saturation (0-100%), and L is lightness (0-100%). HSL is often more intuitive than RGB for creating color variations because adjusting the lightness or saturation sliders produces predictable visual changes.

HWB

Expressed as hwb(H W% B%) where H is the hue angle, W is the whiteness percentage, and B is the blackness percentage. HWB is a newer CSS color format that is intuitive because adding whiteness or blackness to a hue is how humans naturally think about color mixing. It is supported in all modern browsers.

This utility is provided for informational purposes only. KnowKit is not responsible for any errors in the output.

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Frequently Asked Questions

How does the contrast ratio checker work?

The tool calculates the relative luminance of the selected color using the WCAG 2.0 formula and compares it against pure white and pure black. A contrast ratio of 4.5:1 or higher passes WCAG AA for normal text, while 3:1 or higher passes for large text.

Can I use this for print design?

This tool is designed for screen colors (sRGB color space). Print design uses CMYK color space, which has a smaller gamut than sRGB. While you can pick colors here for print mockups, final print colors should be verified with a CMYK conversion tool and printed proofs.

Why does the native color picker look different across browsers?

The native color picker is provided by your operating system and browser. Chrome, Firefox, Safari, and Edge each have their own implementation. The underlying color value is always the same regardless of the visual appearance of the picker.

What is the difference between this and the Color Converter?

The Color Converter is for converting between known color values using text input. The Color Picker adds a visual selection tool, HWB format output, and contrast ratio checking. Use the converter when you have specific values, and the picker when you want to explore colors visually or check accessibility compliance.

Is my color data stored anywhere?

No. All color processing happens entirely in your browser using JavaScript. No color values, selections, or interactions are transmitted to any server or stored in any database.