LAB/LCH Color Converter
Convert CIE L*a*b* and LCH values to HEX, RGB, and HSL instantly - no button to press. Supports both LAB (Cartesian) and LCH (polar) input modes with automatic synchronisation between them. Features a live colour preview, RGB channel bars, sRGB gamut detection, and one-click copy for all output formats. Includes 10 carefully chosen sample colours spanning the visible spectrum. Fully private, 100% free, and no signup required.
Sample Colours
CIE L*a*b* Values
Converted Values
CSS Formats
Why Use Our LAB/LCH Color Converter?
Instant LAB/LCH Conversion
The LAB/LCH converter updates all output values on every keystroke - no button to press. Enter CIE L*a*b* or LCH values and get HEX, RGB, HSL, and CSS colour formats instantly. Switch between LAB and LCH input modes with a single click.
Colour Science Accuracy
Built with precise CIE colour math using the D65 standard illuminant and proper sRGB transfer functions. The LAB/LCH converter detects out-of-gamut colours and warns when results fall outside the sRGB spectrum, ensuring accurate colour science workflows.
100% Private - No Upload
All conversion happens locally in your browser. Your colour values never leave your device and are never sent to any server - safe for proprietary colour systems and research data.
Free & No Limits
Convert unlimited colours with no signup, no subscription, and no usage caps. The LAB/LCH color converter is completely free forever with no ads blocking the interface.
Common Use Cases for LAB/LCH Color Converter
Color Science & Research
Researchers and colour scientists use the LAB/LCH converter to translate between perceptual and device-dependent colour spaces. The CIE L*a*b* colour space is designed to be perceptually uniform, making it essential for scientific colour analysis, quality control, and experimental colour data.
CSS Color Level 4 Development
Web developers use the LAB/LCH converter to work with modern CSS Color Level 4 formats like lab() and lch(). These new CSS functions offer a wider gamut and more intuitive colour manipulation than sRGB, and this tool helps bridge between legacy HEX/RGB and the new perceptual colour spaces.
Colour Palette Harmonization
Designers use the LAB/LCH converter to create harmonized colour palettes with perceptual uniformity. Unlike HSL, where equal hue spacing does not produce visually equal steps, the CIE L*a*b* colour space enables truly uniform colour gradients and harmonious colour relationships.
Print & Digital Colour Matching
Print professionals use the LAB/LCH converter to translate between device-dependent CMYK profiles and device-independent CIE L*a*b* values. LAB values serve as the standard interchange colour space in ICC colour management workflows, ensuring consistent colour across proofing, printing, and digital display.
Display Calibration & Testing
Display engineers and calibration specialists use the LAB/LCH converter to analyse colour accuracy and Delta-E (ΔE) measurements. By converting measured colour values into the CIE L*a*b* colour space, they can quantify display gamut coverage and colour reproduction fidelity.
Accessibility & Perceptual Contrast
Accessibility specialists use the LAB/LCH converter to evaluate perceptual contrast beyond simple luminance ratios. The CIE L*a*b* colour space provides a more accurate model of human colour perception, enabling better contrast analysis for users with visual impairments.
Understanding LAB/LCH Color Conversion
What is CIE L*a*b* (CIELAB) Colour Space?
CIE L*a*b* (also written as CIELAB or LAB) is a colour space defined by the International Commission on Illumination (CIE) in 1976. It describes all colours visible to the human eye and was designed to be perceptually uniform - meaning a change of the same numerical amount in any channel produces a visually similar change. The three channels represent: L* (Lightness, 0 = black, 100 = white), a* (green to red, -128 to +127), and b* (blue to yellow, -128 to +127). This LAB colour converter translates these values into sRGB, HEX, and HSL for practical digital design use.
How Our LAB/LCH Color Converter Works
- Choose your input mode: Select CIE L*a*b* or LCH (Lightness, Chroma, Hue) input. LCH is a polar representation of LAB that separates chromatic intensity (C*) from hue angle (h°), making it more intuitive for colour selection. Our LAB to HEX converter accepts both formats.
- Enter or adjust values: Type numeric values for each channel, or click a sample colour to see how real colours map between colour spaces. The L*, a*, and b* inputs use the full CIE range (L* 0-100, a* and b* -128-127). All processing runs locally in your browser - your colour data never leaves your device.
- View converted results instantly: As you type, the tool converts your LAB or LCH values to HEX, RGB, HSL, and CSS formats in real time. A colour swatch provides a visual preview, and channel bars show the RGB breakdown. If the colour falls outside the sRGB gamut, a warning highlights the limitation.
LAB vs LCH - Which Should You Use?
- CIE L*a*b* (Cartesian): Best for colour difference calculations (Delta-E), scientific analysis, and colour management workflows. The rectangular a*/b* grid makes it easy to see relationships between green-red and blue-yellow axes. Use this when working with ICC profiles or performing colour quality control.
- LCH (Polar): More intuitive for colour selection and CSS design. Chroma (C*) represents colour intensity or saturation, while Hue (h°) represents the colour angle on a wheel (0° = red, 90° = yellow, 180° = green, 270° = blue). LCH is the basis for the modern CSS
lch()colour function and is preferred by frontend developers for creating colour scales. - When to convert: Use this LAB/LCH converter when you need to translate between the perceptual CIE colour spaces and practical sRGB formats for web or digital display. This is essential for modern CSS development, colour science research, and cross-media colour matching.
Gamut Limitations & Device-Dependent Colour
CIE L*a*b* describes all visible colours, but sRGB (the standard colour space for web and most displays) covers only a subset. When you convert LAB to HEX or RGB, colours outside the sRGB gamut are clipped to the nearest representable value. Our LAB to RGB converter detects these out-of-gamut colours and shows a warning, so you know when the preview is an approximation. For the widest gamut, consider using Display P3 or Rec. 2020 colour spaces available in modern CSS through color() function.
Related Color Tools
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Color Difference Calculator (ΔE 2000)
Calculate the perceptual colour difference (ΔE 2000 / CIEDE2000) between any two colours with a CIE L*a*b* breakdown.
HEX to RGB Converter
Convert any HEX colour code to RGB and RGBA values instantly. Supports 3-digit, 6-digit, 4-digit, and 8-digit HEX formats.
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Interactive colour wheel - click any position to explore complementary, analogous, triadic, tetradic, and monochromatic colour harmonies.
Frequently Asked Questions About LAB/LCH Color Converter
A LAB/LCH color converter transforms CIE L*a*b* (CIELAB) and LCH (Lightness-Chroma-Hue) values into their equivalent sRGB, HEX, and HSL representations. Our LAB/LCH converter supports both input modes (LAB and LCH) and provides real-time conversion with colour preview, RGB channel bars, and sRGB gamut detection. All colour math uses the D65 standard illuminant for accurate CIE colour science.
To convert LAB to HEX, select the CIE L*a*b* input mode and enter values for L* (0-100), a* (-128 to 127), and b* (-128 to 127). The LAB/LCH converter instantly displays the equivalent HEX, RGB, and HSL values. For example, L*: 53.24, a*: 80.09, b*: 67.20 converts to #FF0000 (pure red). You can also click any sample colour to see how real colours map between colour spaces.
CIE L*a*b* uses rectangular Cartesian coordinates where a* represents green-red and b* represents blue-yellow. LCH is the polar form of LAB: L* (Lightness) is the same, C* (Chroma) represents colour intensity, and h° (Hue) represents the colour angle on a wheel (0° = red, 90° = yellow, 180° = green, 270° = blue). Our LAB/LCH converter supports both formats and automatically synchronises values between them.
Yes. All conversion happens 100% client-side in your browser using JavaScript. Your colour values are never sent to any server, never stored, and never transmitted anywhere. The LAB/LCH color converter is completely private and processes everything locally on your device - safe for proprietary colour systems and confidential research data.
sRGB is the standard colour space for web and most digital displays, but it covers only a subset of all visible colours (about 35% of the CIE colour spectrum). When your LAB or LCH values produce a colour outside sRGB, our LAB/LCH converter shows a warning. The displayed RGB preview is an approximation - the actual colour is more vivid than what your sRGB monitor can show. Consider using Display P3 or Rec. 2020 compatible displays for wider gamut colours.
Yes. The LAB/LCH converter is 100% free with no signup required, no premium features, and no usage limits. Convert unlimited colours without any restrictions or hidden costs. There are no ads blocking the interface.
CSS Color Level 4 introduced the lab() and lch() colour functions, which are now supported in all major browsers (Chrome 111+, Firefox 113+, Safari 15.4+). The lab() function takes parameters like lab(50% 40 -20) while lch() takes lch(50% 60 300). Our LAB/LCH converter helps you work with these modern CSS functions by showing the exact CSS syntax for your LAB and LCH values.
This LAB/LCH converter uses the D65 standard illuminant, which represents average daylight with a correlated colour temperature of approximately 6500K. D65 is the most widely used illuminant in colour science, display calibration, and web colour standards (including sRGB). The conversion uses the CIE 1931 2° standard observer for XYZ to LAB transformations.