What this tool does
The Color Name Finder identifies the closest CSS named color to any color you choose. You can use the color picker to visually select a color, or type a hex value (like \`#3b82f6\`) or an RGB value (like \`rgb(59, 130, 246)\`) directly into the text field. The tool instantly compares your color against all 140 standard CSS named colors and returns the best match by name and hex value.
This is useful for designers who need to reference colors by human-readable names, developers writing CSS who want to avoid abstract hex codes, or anyone trying to describe a color to another person without relying on technical notation.
How the nearest-color algorithm works
The tool uses **Euclidean distance in RGB color space** to find the closest named color. Every color can be represented as a point in a three-dimensional space where the axes are Red, Green, and Blue (each from 0 to 255).
The distance between two colors is calculated with the standard 3D distance formula:
\`\`\` distance = sqrt((R1 - R2)² + (G1 - G2)² + (B1 - B2)²) \`\`\`
The tool computes this distance between your input color and every one of the 140 CSS named colors, then returns the one with the smallest distance. A distance of 0 means your color is an exact CSS named color. Larger distances mean the match is an approximation — the named color that most closely resembles yours, even if it's not identical.
The maximum possible distance in RGB space is approximately 441 (the distance from pure black \`#000000\` to pure white \`#ffffff\`). Most color matches will have a distance well below 50, indicating a close visual similarity.
What are CSS named colors?
CSS named colors are a set of 140 predefined color keywords recognized by all web browsers. Instead of writing \`color: #ff0000\`, you can write \`color: red\` — the browser understands both. These names range from common ones like \`red\`, \`blue\`, and \`green\` to more descriptive ones like \`cornflowerblue\`, \`lemonchiffon\`, \`papayawhip\`, and \`rebeccapurple\`.
The list was first standardized in CSS Level 1 and has grown through subsequent versions. The names originated from the X11 color system used in Unix systems. Some names are intuitive (\`hotpink\`, \`skyblue\`, \`tomato\`), while others reflect historical naming conventions (\`burlywood\`, \`moccasin\`, \`bisque\`).
Using named colors in CSS can improve code readability in situations where the color has a clear semantic meaning — \`color: crimson\` communicates intent better than \`color: #dc143c\` in many contexts. However, for precise design systems, hex or HSL values are usually preferred because named colors offer limited variety compared to the 16 million possible RGB combinations.
Understanding the color distance value
When the tool displays a "Color Distance" value, it tells you how far your chosen color is from the nearest CSS named color in RGB space. Here is a rough guide to interpreting the distance:
- **0**: Exact match — your color is a CSS named color - **1–15**: Very close — visually nearly identical, only subtle differences - **16–40**: Close — colors look similar, minor hue or lightness variation - **41–80**: Moderate — recognizable similarity, but noticeable difference - **81+**: Distant — the named color is the closest available, but may look quite different
For design work, a distance under 20 typically means the named color is an acceptable stand-in for your exact color. Higher distances suggest you should use the hex value directly rather than substituting the named color.
How to use
1. **Use the color picker**: Click the colored square to open your browser's native color picker. Select any color and the result updates instantly. 2. **Type a hex value**: Enter a hex color like \`#ff6347\` or \`ff6347\` (with or without the \`#\` prefix) into the text field. 3. **Type an RGB value**: Enter an RGB color like \`rgb(255, 99, 71)\` into the text field. 4. **Read the result**: The nearest CSS named color name appears as the main result, along with its hex and RGB values. 5. **Compare swatches**: View your input color alongside the matched named color to see how close they are visually. 6. **Copy values**: Use the copy buttons to copy the color name, hex, RGB, or CSS property directly to your clipboard.
FAQs
Q: Why doesn't my exact color have a name? A: Only 140 specific colors have official CSS names. The RGB color system supports over 16 million distinct colors, so most colors do not have an official name. This tool finds the closest named color to any input.
Q: Can I use the CSS color name directly in my stylesheet? A: Yes. All 140 CSS named colors are fully supported in every major browser, including Chrome, Firefox, Safari, and Edge. The result name (like \`cornflowerblue\`) can be used directly as a CSS color value.
Q: What is rebeccapurple and why does it exist? A: \`rebeccapurple\` was added to CSS in 2014 as a tribute to Rebecca Meyer, the six-year-old daughter of CSS developer Eric Meyer, who passed away. It is defined as \`#663399\`. It is the only CSS named color added specifically to honor a person.
Q: Why does the tool show two different colors that look the same (like aqua and cyan)? A: Some CSS named colors are aliases — they share identical hex values. \`aqua\` and \`cyan\` both resolve to \`#00ffff\`. \`fuchsia\` and \`magenta\` both resolve to \`#ff00ff\`. The tool picks the first match when two colors are equidistant.
Q: Is Euclidean RGB distance the best way to match colors? A: It is simple and fast. Perceptual color spaces like CIE Lab* produce more visually accurate matches because they account for how human eyes perceive color differently across the spectrum. However, for the purpose of matching against a small set of named colors, Euclidean RGB distance produces good results and is easy to understand.
Q: Can I enter a 3-digit hex shorthand? A: Yes. Shorthand hex values like \`#f0f\` or \`#abc\` are supported. The tool expands them to their 6-digit equivalents automatically.
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