Colour converter

Data

Convert a colour between hex, RGB, HSL, HSV, CMYK and CIE Lab, find its nearest CSS name, and check WCAG contrast against another colour.

What it does

Hex, RGB, HSL, HSV, CMYK and Lab
Nearest CSS colour name
WCAG contrast check against a second colour
Matching schemes: complementary, triadic, tints and more

Good for

Design tools
Accessibility checks
Brand palettes

Give it a brand colour and it also tells you whether black or white text reads better on top of it.

Example

GETPOST https://bloodweb.net/api/v1/color-convert

curl -H "Authorization: Bearer YOUR_KEY" "https://bloodweb.net/api/v1/color-convert?color=%23c0392b&contrast_with=white"

Options

Name	Description
`color` required	Any of: #c0392b, #c0392b80, rgb(192, 57, 43), rgba(...), hsl(6, 63%, 46%), hsv(6, 78%, 75%), cmyk(0%, 70%, 78%, 25%), or a CSS name such as tomato.
`contrast_with`	A second colour, in any of the same forms. Adds the WCAG 2 contrast ratio and pass or fail for AA and AAA.
`scheme`	Also return a matching set of colours built from this one. One of: complementary, analogous, triadic, split, tetradic, shades, tints

Returns

JSON: hex, rgb, hsl, hsv, cmyk, lab (each as numbers and as a CSS string where CSS has one), name (exact CSS name or null), nearest_name, luminance, best_text (black or white), and contrast when asked.