CSS Color Generator

What the CSS Color Generator Does

Choose a colour and it instantly gives you the values you would paste into CSS: the hex code, the rgb() function, the HSL function, and a CMYK approximation for reference. Each value updates live as you adjust the colour, and each copies with a click.

It is the fast way to move a colour from a picker into your stylesheet in whatever notation you prefer, without converting by hand.

How It Works

The native colour input gives a hex value. The tool reads that hex, splits it into red, green and blue, and from those derives the other notations: rgb() is the channels as-is, HSL is computed by finding the hue angle, saturation and lightness, and CMYK is estimated from the RGB values.

All of this happens the moment you change the colour, so the four representations always describe the same shade. The hex, rgb() and HSL values are exact conversions of one another; the CMYK is a print-oriented estimate shown for convenience.

Data source & conversion logic

1. Pick the colour. Choose from the swatch or type a hex code to set the colour.
2. Read the hex. Take the hex value and split it into red, green and blue channels.
3. Convert to each notation. Derive rgb(), HSL and a CMYK approximation from those channels.
4. Show copyable values. Display HEX, rgb(), HSL and CMYK, each ready to copy into your CSS.

Standards & references

• CSS colour syntax — CSS accepts colours as hex (#RRGGBB), rgb() and hsl() among others. The tool outputs these so you can paste whichever your stylesheet uses.
• Native colour input — The browser's colour picker returns a 7-character lowercase hex with no alpha channel. That is the source value the other notations are built from.
• sRGB — The standard colour space for the web, so the values display and render consistently across browsers and devices.

Accuracy & Limitations

The HEX, rgb() and HSL values are exact, lossless conversions of the same colour — convert between them in any direction and you return to the same shade (allowing for HSL's rounding to whole degrees and percentages).

The CMYK value is a simple approximation, the same profile-free formula used by the RGB-to-CMYK tool. It is fine for a rough idea of ink mix but is not a colour-managed print value; for print, use your shop's ICC profile.

The native colour input has no alpha, so the tool works with fully opaque colours. For transparency you would add an alpha value yourself in rgba() or an 8-digit hex.

Hex is shown in uppercase by convention. CSS is case-insensitive for hex, so the casing does not change the colour — it is purely cosmetic.

Real-World Use Cases

When to use it — and when not to

For transparency, write rgba() or an 8-digit hex yourself. For a coordinated scheme, use a palette generator. For print-accurate CMYK, convert through an ICC profile. The Color Picker tool is the same engine if you prefer that entry point.

Frequently Asked Questions

References

• color CSS data type (MDN Web Docs)
• input type=color (MDN Web Docs)
• sRGB (Wikipedia)

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