CSS light/dark themes refer to two color schemes for web pages - light mode and dark mode. Modern browsers support the prefers-color-scheme media query to automatically switch themes based on user system preferences. CSS also natively supports the light-dark() function to define dual-theme colors.
There are three ways: 1) CSS variables + media query - define two sets of color variables and switch with prefers-color-scheme; 2) CSS light-dark() function - define dual-theme colors in one line; 3) CSS class toggle - add/remove a dark class via JavaScript. This tool supports generating the first two approaches.
The tool converts colors in HSL color space: when converting light to dark, it reduces lightness and slightly adjusts hue; when converting dark to light, it increases lightness. It maintains consistency in hue and saturation to ensure visual harmony between both themes.
No. All color conversion is done locally in your browser. No data is sent to any server.
The light-dark() function is supported by Chrome 123+, Firefox 120+, and Safari 17.5+. For projects that need to support older browsers, the CSS variables + media query approach is recommended.