What color formats are supported?

HEX (#RRGGBB), RGB, RGBA, and HSL. You can input any format and see all others update in real-time.

Does it support 3-digit HEX?

Yes. #f0c is automatically expanded to #ff00cc. Output always shows the 6-digit form.

Use the native color picker (click the colored square). In Chromium browsers it supports the EyeDropper API for screen picking.

HSL (Hue, Saturation, Lightness) is a perceptually different color model. Hue goes 0-360°, S and L are 0-100%. Same color, different coordinates.

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What color formats are supported?: HEX (#RRGGBB), RGB, RGBA, and HSL. You can input any format and see all others update in real-time.
Does it support 3-digit HEX?: Yes. #f0c is automatically expanded to #ff00cc. Output always shows the 6-digit form.
Can I pick a color from my screen?: Use the native color picker (click the colored square). In Chromium browsers it supports the EyeDropper API for screen picking.
Why does HSL look different?: HSL (Hue, Saturation, Lightness) is a perceptually different color model. Hue goes 0-360°, S and L are 0-100%. Same color, different coordinates.