Relative luminance

Client

Single-color luminance for contrast math.

About Relative luminance

WCAG relative luminance of a hex color. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • WCAG contrast checker — Foreground vs background: contrast ratio and WCAG AA/AAA for normal and large text. when color values need conversion, contrast review, or theme export.
  • WCAG AA contrast — Pass/fail WCAG AA (4. when color values need conversion, contrast review, or theme export.
  • Color tools — Hub for converter, harmony palettes, tint/shade scales, Tailwind-style theme, MUI createTheme palette, HeroUI-style CSS variables, WCAG c… when color values need conversion, contrast review, or theme export.
  • RGB color distance — Euclidean distance between two hex colors in RGB. when color values need conversion, contrast review, or theme export.

Common use cases

  • Relative luminance for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.