Luminance Analyzer
Compute a color's relative luminance (WCAG) to judge how light/dark it is. Everything runs on your device — fast, free, and private.
The result will appear here…
or press Ctrl+Enter
Everything runs in your browser. Your data is never sent to our servers.
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Example
Example Input
#00B8E6
Example Output
Relative luminance: 0.41 — use dark text
How to Use
- 1Enter a color or data in the Input field.
- 2Set "More settings" if needed, then click Run (or Ctrl+Enter).
- 3Copy the result — a swatch is shown next to each value.
About Luminance Analyzer
The Luminance Analyzer computes a color's relative luminance (0 = black, 1 = white) using the WCAG formula. This value underlies contrast-ratio calculations.
Useful for deciding whether dark or light text should sit on top of a color.
FAQ
Is my data sent to a server?
No. Luminance Analyzer runs entirely in your browser — your data never leaves your device.