Question 1

What is OKLCH color space?

Accepted Answer

OKLCH is a perceptually-uniform color space standardized in CSS Color Level 4. It uses Lightness (0-1 or 0%-100%), Chroma (saturation, 0-0.4+) and Hue (0-360 degrees). Unlike HSL, equal numerical changes in OKLCH look visually equal to humans, so it produces more uniform gradients and predictable color mixing.

Question 2

Which browsers support OKLCH?

Accepted Answer

OKLCH is supported in all modern browsers since 2023: Chrome 111+, Firefox 113+, Safari 15.4+ and Edge 111+. You can use oklch() directly in CSS like color: oklch(70% 0.15 250). Coverage is over 96% of users globally as of 2026.

Question 3

Why use OKLCH instead of HSL?

Accepted Answer

HSL lightness is mathematically based on RGB, not human perception, so 50% lightness yellow looks much brighter than 50% lightness blue. OKLCH fixes this — its lightness matches what your eye actually sees, making color palettes, tints and shades far more predictable and harmonious.

Question 4

Is this OKLCH converter free?

Accepted Answer

Yes, completely free with no signup. All color math runs locally in your browser and nothing is ever uploaded to a server.