Color converter

Convert color between the different formats (hex, rgb, hsl and css name)

Enable JavaScript to use the interactive tool. The guide below explains how it works.

Color Converter: Technical Documentation and Color Spaces

1. What the Tool Does

The Color Converter is a versatile utility for translating color values between different mathematical representations and standards. It supports a wide array of color spaces used in web development, graphic design, and print media.

By leveraging the colord library, the tool provides high-precision conversions across:

• HEX/HEXA: Standard hexadecimal notation (e.g., #FF5733).
• RGB/RGBA: Red, Green, Blue (and Alpha) coordinates.
• HSL: Hue, Saturation, and Lightness.
• HWB: Hue, Whiteness, and Blackness (often considered more intuitive for humans).
• LCH: Lightness, Chroma, and Hue (perceptually uniform color space).
• CMYK: Cyan, Magenta, Yellow, and Key/Black (the standard for physical printing).
• Color Names: CSS named colors (e.g., royalblue) with "closest match" logic.

2. Why Someone Uses It

Color is not just an aesthetic choice; it's a technical requirement that varies depending on the medium and technology stack. Engineers and designers use this tool to:

• Web Development Consistency: Converting HEX codes from a design tool (like Figma) into rgba() for CSS to apply transparency.
• Design to Code: Translating a brand's CMYK print colors into web-safe RGB or HEX values.
• Accessibility: Using HSL or LCH to programmatically create color palettes with consistent perceived brightness for better contrast and readability.
• Modern CSS Features: Experimenting with the lch() function in modern browsers, which allows for colors outside the standard sRGB gamut.
• Theme Generation: Calculating light and dark variants of a base color by adjusting the Lightness (L) in HSL or LCH.
• Debugging: Identifying why a color looks different in CSS than it does in a design file by inspecting the raw values across different spaces.

3. Step-by-Step Instructions

1. Input: You can start in several ways:
   • Click the Color Picker box to visually select a color.
   • Type a value into any of the text fields (HEX, RGB, etc.).
2. Automatic Update: As you change any value, all other fields update in real-time. For example, if you change the Red value in RGB, the HEX and HSL values will immediately reflect the change.
3. Validation: If you enter an invalid value (e.g., rgb(300, 0, 0) or an invalid HEX), the tool will show a validation error and stop updating until a valid value is provided.
4. Named Colors: If you have a specific color name like "DeepSkyBlue", you can type it into the "Name" field. Conversely, any color you pick will show the "Closest Name" in that field.
5. Copying: Click the copy icon next to any field to copy the formatted string (e.g., hsl(210, 100%, 50%)) to your clipboard.

4. Examples

HEX to RGBA

• Input (HEX): #1ea54c
• Output (RGB): rgb(30, 165, 76)

Brightening a Color with HSL

• Input (HEX): #0000FF (Blue)
• Output (HSL): hsl(240, 100%, 50%)
• Action: Increase the Lightness percentage in the HSL field to 75% to get a lighter blue.

Print Preparation (CMYK)

• Input (HEX): #FF0000 (Pure Red)
• Output (CMYK): cmyk(0, 100%, 100%, 0)

LCH for Perceptual Uniformity

• Input (HEX): #f9c200
• Output (LCH): lch(79.31, 84.15, 85.34) (Note how Lightness is represented as a real number based on human perception).

5. FAQs

Q: What is the difference between HSL and LCH? A: HSL is a transformation of the RGB cube and doesn't account for how humans perceive brightness (e.g., yellow looks much brighter than blue at the same "Lightness" value in HSL). LCH is "perceptually uniform," meaning a change in Lightness (L) feels the same across different Hues.

Q: Why does CMYK look different when printed? A: CMYK is a subtractive color model for ink, while RGB is additive for light. Not all RGB colors can be represented in CMYK (they are "out of gamut"). This tool provides a mathematical conversion, but professional printing may require specific ICC profiles.

Q: Does the tool support transparency? A: Yes. If you use HEXA (8 digits) or rgba(), the alpha channel is preserved and reflected in the other formats that support transparency (like hsla).

Q: How accurate is the "Closest Name" feature? A: It calculates the mathematical distance between your current color and the standard list of 140+ CSS named colors. It's very accurate for exact matches and provides the nearest linguistic approximation for others.

6. Common Mistakes

• Incorrect HEX Length: Forgetting that HEX codes must be 3, 4, 6, or 8 characters (plus the #).
• Out of Range RGB: Entering values higher than 255.
• Confusing HSL and HSV: This tool uses HSL (Lightness), which is standard for CSS. HSV (Value) or HSB (Brightness) is common in Photoshop but has different math.
• Assuming CMYK is Perfect: Using CMYK values from this tool for high-end professional printing without checking with a printer. Digital CMYK is an approximation.

7. Use Cases

For Web Designers

Defining a primary brand color in HEX and then using the HSL values to create hover states (by decreasing Lightness) and disabled states (by decreasing Saturation).

For CSS Developers

Converting HEX colors to rgba() to use the alpha channel for overlays, shadows, or "glassmorphism" effects.

For App Developers

Translating brand colors into the specific formats required by different platforms (e.g., UIColor in iOS or Color in Android/Compose, which often use RGB or HEX).

For Marketing Teams

Quickly finding the closest CSS name for a brand color to use in simple HTML emails or internal documentation where technical codes might be confusing.

8. Related Tools

• Color Palette Generator: Use this converter to refine individual colors after generating a full palette.
• Contrast Ratio Checker: Essential for ensuring your converted colors meet WCAG accessibility standards.
• SVG Color Replacer: Useful for bulk-updating colors in vector assets using the values found here.
• CSS Gradient Generator: Uses these color formats to create complex visual backgrounds.