Toolivoo's Color Picker is a free, browser-based tool designed for web developers, UI/UX designers, and anyone who works with digital color. It lets you pick any color using an interactive visual swatch, then instantly converts it between HEX, RGB, and HSL formats — the three most common color notations used in web design and digital graphics. There is no software to install, no account to create, and no data is ever sent to a server. Everything runs privately in your browser. Whether you are building a website, designing a brand identity, or simply trying to identify a color you saw online, this tool gives you everything you need in one place.
#ff6b6b) or into the R, G, B number fields to set a color manually — all other fields update automatically.Most color picker tools online either require a sign-up, limit your usage, or exist behind paywalls. Toolivoo's Color Picker is fully free, with zero restrictions and no account required. The tool supports bidirectional conversions — meaning you can input a color in any format (HEX, RGB, or individual R/G/B values) and every other format updates automatically. This is essential for developers who switch between writing CSS hex codes and Figma's RGB sliders regularly.
Web developers benefit from having HEX output ready to paste directly into CSS or Tailwind config files. Graphic designers working in Adobe Photoshop, Illustrator, or Figma can use the RGB values directly in those tools' color panels. The HSL format is particularly useful for creating consistent color palettes — you can keep the hue constant and vary lightness or saturation to generate shades and tints systematically. The color name identifier also helps when you need a quick human-readable label for a color during team discussions or documentation.
All color processing runs entirely in your browser — no data is ever transmitted to any server.
HEX (hexadecimal) is a 6-character color code such as #2563eb, where each pair of characters represents the Red, Green, and Blue channels in base-16 (ranging from 00 to FF). RGB is a functional notation like rgb(37, 99, 235) that expresses the same three channels as decimal numbers from 0 to 255. Both formats describe exactly the same set of colors — HEX is the more compact notation preferred in HTML attributes and many CSS properties, while RGB is often used when you need to perform arithmetic on channel values or add transparency with rgba().
To convert a HEX color to RGB, split the 6-digit code into three pairs and convert each pair from base-16 to base-10. For example, #2563eb splits into 25, 63, eb. The conversion: 25 hex = (2 × 16) + 5 = 37; 63 hex = (6 × 16) + 3 = 99; eb hex = (14 × 16) + 11 = 235. So #2563eb equals rgb(37, 99, 235). Our tool performs this calculation instantly as you type, saving you the manual work.
HSL stands for Hue, Saturation, and Lightness. Hue is the color's position on the color wheel expressed as an angle from 0° to 360° (0° = red, 120° = green, 240° = blue). Saturation indicates how vivid or grey the color is (0% is pure grey, 100% is the most vivid version of the hue). Lightness controls brightness (0% is black, 50% is the pure color, 100% is white). HSL is popular with designers because the three values map intuitively to how humans perceive color — you can darken a color by reducing lightness, desaturate it by lowering saturation, or shift it to a warmer or cooler shade by adjusting hue, all independently.
Yes, absolutely. The tool is built specifically with web designers and front-end developers in mind. It outputs colors in all three formats natively supported by CSS: HEX (#rrggbb), RGB (rgb(r, g, b)), and HSL (hsl(h, s%, l%)). You can paste any of these values directly into your CSS files, Tailwind CSS configuration, CSS custom properties, Sass variables, or design tools like Figma and Adobe XD that accept standard CSS color notation.
Yes, Toolivoo's Color Picker is completely free to use. There are no usage limits, no account or email required, and no paid tier. You can pick and convert as many colors as you need, at any time, at no cost. We believe essential developer and designer tools should be freely accessible to everyone.
Yes, the tool is fully responsive and works on all modern mobile browsers including Chrome for Android and Safari on iOS. The layout switches to a single-column view on small screens, all interactive elements have touch targets of at least 44px, and input font sizes are set to prevent unwanted zoom on iOS devices. You can pick, convert, and copy colors just as effectively on your phone or tablet as on a desktop computer.
Color is one of the most fundamental building blocks of digital design — yet color formats are often a source of confusion for developers and designers alike. When you open a CSS file and see #3b82f6 next to rgb(59, 130, 246) next to hsl(217, 91%, 60%), it can be hard to know which one to use, how they relate to each other, and why so many formats exist for the same thing. This guide answers all of those questions and gives you the practical knowledge to choose the right color format for any situation.
HEX (hexadecimal) color codes are the most widely recognized color notation in web development. A standard HEX color looks like #RRGGBB, where each pair of characters represents the intensity of Red, Green, and Blue respectively, expressed in base-16. Each channel ranges from 00 (0 in decimal, no intensity) to FF (255 in decimal, maximum intensity). For example, pure red is #ff0000 (full red, no green, no blue), white is #ffffff (all channels at maximum), and black is #000000 (all channels at zero).
There is also a 3-digit HEX shorthand — #RGB — which is an abbreviation for colors where both digits in each pair are the same. For example, #f0c expands to #ff00cc. HEX codes are case-insensitive, so #2563EB and #2563eb are identical. HEX is the format you will encounter most often in HTML attributes, CSS stylesheets, and design tools. It is compact, unambiguous, and universally supported.
RGB stands for Red, Green, Blue — the three primary colors of light. The RGB model is an additive color model, meaning colors are created by adding light together. Combining full intensities of all three channels produces white light; combining none of them produces black. This is the opposite of how paint or ink mixing works (which is a subtractive model).
In CSS, RGB is expressed as rgb(red, green, blue), where each value is a whole number between 0 and 255. For example, rgb(255, 165, 0) is orange — full red (255), partial green (165), no blue (0). The RGB format is particularly useful when you need to manipulate color channels programmatically in JavaScript or when you want to add transparency using the extended rgba(red, green, blue, alpha) notation, where alpha is a value from 0 (fully transparent) to 1 (fully opaque). Modern CSS also supports rgb() with a slash for alpha: rgb(255 165 0 / 50%).
HSL — Hue, Saturation, Lightness — was designed to be more intuitive than HEX or RGB. Instead of specifying how much of each colored light to mix, HSL describes color the way humans perceive it: what color is it (hue), how vivid is it (saturation), and how light or dark is it (lightness).
The Hue value is an angle on the color wheel from 0° to 360°. Red sits at 0°/360°, yellow at 60°, green at 120°, cyan at 180°, blue at 240°, and magenta at 300°. Saturation is a percentage: 0% means the color is completely grey (no color), while 100% means it is the most vivid version of that hue. Lightness is also a percentage: 0% is always black regardless of hue, 100% is always white, and 50% is the pure color at its natural brightness.
The power of HSL becomes clear when building design systems. If you want a range of blues from light to dark for button hover states, disabled states, and backgrounds, you can keep the hue and saturation fixed and simply vary the lightness — something that is nearly impossible to reason about intuitively in HEX. Many CSS preprocessors like Sass have built-in functions like lighten() and darken() that work on this principle.
There is no single "best" format — the right choice depends on context. Here is practical guidance for common scenarios:
Use HEX when writing static CSS values that do not need to be manipulated. HEX is the most compact notation and is universally readable by designers, developers, and tools. It is the standard in brand style guides, design tokens, and Tailwind CSS configuration files. When copying a color from Figma or a color picker, HEX is what you will get by default.
Use RGB when you need transparency (via rgba()), when you are manipulating color values in JavaScript, or when working with canvas graphics or WebGL where color components are processed numerically. RGB is also the format to use when specifying colors in inline styles via JavaScript's element.style.color property if you need computed channel values.
Use HSL when you are building a design system or theming engine and need to generate color scales, shades, or tints programmatically. With CSS custom properties (variables), you can define a base hue and derive a full palette: --color-primary: hsl(220, 83%, 53%). You can then create lighter variants by simply increasing lightness in derived variables. This approach is used in many modern design systems.
Converting between HEX and RGB is straightforward because they represent the same information — it is just a change in base. Each HEX pair maps to one decimal RGB channel. To convert HEX to RGB: take the hex string, remove the #, split into three two-character pairs, and parse each as a base-16 integer (using parseInt(pair, 16) in JavaScript). To convert RGB back to HEX: convert each decimal channel to a two-character hex string with padding (using value.toString(16).padStart(2, '0')) and concatenate with a # prefix.
Converting RGB to HSL requires a slightly more involved formula. Normalize each channel to a 0–1 range, find the maximum and minimum channel values, and derive the hue from which channel is largest and the difference between channels. Saturation and lightness derive from the max, min, and their sum. This is the algorithm used in our Color Picker tool. Converting HSL back to RGB is the reverse process, mapping the hue angle and saturation/lightness percentages back through the same channel relationships.
While knowing the formulas is useful, our Color Picker tool handles all of these conversions instantly as you type or drag the color picker — so you never need to run the calculations manually. You can also read the full specification for all CSS color formats in the MDN Web Docs reference for CSS color values.
Understanding HEX, RGB, and HSL is fundamental knowledge for any developer or designer working on the web. HEX gives you compact, copy-pasteable codes. RGB gives you numerical control over individual channels. HSL gives you perceptual, designer-friendly color relationships. The best approach is to understand all three and choose the right one for each job — and to keep a fast, reliable conversion tool like our free Color Picker close at hand when you need to switch between them.