Lab to HWB | Color Code Converter | Color Conversion
Online Lab to HWB tool: enter a Lab color value to convert it to HWB in real time, with one-click copy of the result. Free and no registration required.
LabEnter or adjust the color values
rgba(255, 87, 51, 1)
HWB
hwb(11 20% 0%)
H
11
W
20
B
0
All Color Conversion Combinations
132 itemsAbout Lab to HWB
Lab to HWB is a free online tool that converts Lab to HWB, helping you quickly convert colors and switch between formats in web design, front-end development, and graphic design. Lab is A perceptually uniform color space defined by the CIE, expressed with lightness L and the two chroma axes a and b. HWB is Describes color through hue (H), whiteness (W), and blackness (B); a format introduced in CSS Color 4. At its core, Lab to HWB takes a color value expressed in Lab and converts it into HWB using a mathematical algorithm. The tool shows the result as both a visual color swatch and a complete CSS string, and you can copy it to the clipboard with a single click—no manual calculation or lookup tables required. This makes color code conversion fast, accurate, and reproducible, and it is suitable for designers, front-end developers, UI engineers, and anyone else who works with color.
What Is Lab to HWB
Lab is a perceptually uniform color space defined by the CIE, describing color with L (lightness 0-100) and the two chroma axes a and b. The a axis is green-red and the b axis is blue-yellow. HWB describes color through hue (H), whiteness (W), and blackness (B). It is a format added in CSS Color 4. H is 0-360°, and W and B are 0-100%. First convert Lab to RGB, then to HSV, and finally compute W and B according to the HWB definition.
How to Use Lab to HWB
Using this Lab to HWB tool is very simple and takes just three steps. First, select Lab from the "Source Color Unit" dropdown on the left (it is selected by default), and enter the Lab value you want to convert in the input card. Second, select HWB from the "Target Color Unit" dropdown on the right; the tool instantly calculates and displays the corresponding HWB value, along with a color swatch preview and the complete CSS string, so you can confirm the color and format at a glance. Third, once you are happy with the result, click the "Copy" button to copy the HWB value to your clipboard and paste it straight into your code or design software. If you picked the wrong source or target unit, click the "⇄" button in the middle to swap them with one click. The whole process requires no registration and no data upload—all calculations run locally in your browser.
Use Cases for Lab to HWB
Use this when a modern CSS project needs HWB. Color management, color-difference calculation, cross-device color consistency checks, and evaluating color shifts between print and screen. Modern CSS projects, color-tuning tasks that need intuitive hue adjustment, and color schemes that complement HSL.
How Lab to HWB Works
First convert Lab to RGB, then to HSV, and finally compute W and B according to the HWB definition. Lab is built on top of the CIE XYZ space. A non-linear transform makes numerical differences approximate differences perceived by the human eye. The Lab distance between two colors (ΔE) directly reflects how different they look. The intuitive meaning of HWB is: first choose a pure hue, then add white (to lighten) or black (to darken) to it. W and B cannot both exceed 100%, and when their sum exceeds 100% they are normalized proportionally.
Tips for Using Lab to HWB
Lab to HWB is a cross-model conversion and may be clipped due to out-of-gamut values; after conversion W+B usually does not exceed 100%. The L in Lab is not the same as the L in HSL: the L in Lab is perceptual lightness and better matches how people sense brightness. Lab conversion goes through an intermediate XYZ step, so the formulas are fairly complex. HWB is closer to the intuition of "adding white or black to paint" than HSL. W=B=0 gives a pure color, and W+B=100% gives gray.
Frequently Asked Questions (FAQ)
Is Lab to HWB accurate?
The HWB part is computed from the approximate RGB, so the accuracy is the same as Lab to RGB.
Can Lab to HWB go out of gamut?
It may. The part outside the sRGB gamut is clipped.
Which browsers support HWB?
Modern browsers such as Chrome 101+, Safari 15+, and Firefox 96+.
What is the Lab color difference ΔE?
ΔE is the Euclidean distance between two points in Lab space, used to quantify the perceived difference between two colors. When ΔE < 1, the human eye can barely tell them apart.
Can Lab go outside the sRGB gamut?
Yes. Lab can represent every color visible to the human eye, and some Lab values cannot be displayed accurately on an sRGB screen.
What is the difference between HWB and HSL?
HSL controls lightness through the L channel, while HWB controls lightening and darkening separately through whiteness W and blackness B; the latter is closer to the physical experience of mixing paint.
Which browsers support HWB?
Modern browsers such as Chrome 101+, Safari 15+, and Firefox 96+ support it; older browsers may not.
Can I convert in the opposite direction?
Yes. You can go directly to the "HWB to Lab" page, or click the "⇄" swap button in the middle of the current page to exchange the source and target units and convert in the opposite direction. The reverse conversion is just as precise, because the color conversion math is reversible.
Can I use the conversion results commercially?
Yes. Color values are numerical information and involve no copyright issues, so you are free to use the conversion results in websites, apps, design work, or commercial projects without authorization or attribution. Do note, however: if the original color comes from material that someone else holds the copyright to, using the color itself is unrestricted, but the copyright to the original material still belongs to its author.