Which format should I copy?

HEX for CSS and design tools. RGB when a tool wants separate channels. HSL when you want to adjust lightness or saturation by hand, because the numbers mean something you can reason about.

Can I pull colours out of a screenshot?

Yes — that is the common use. Upload the screenshot and sample any pixel in it.

What formats does it give me?

HEX, RGB and HSL, plus a ready CSS custom property. Any of them copies with one click.

Can I build a palette from a photo?

Yes. Keep each colour you sample and the palette builds up beside the image, ready to copy.

Color Picker

Sample any pixel for HEX, RGB and HSL, and build a palette from what you keep.

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How to use Color Picker

Upload an image, or use the picker directly.
Click any pixel to sample it. HEX, RGB and HSL are shown together.
Keep the colours you like and build a palette from them.

Questions

Which format should I copy?: HEX for CSS and design tools. RGB when a tool wants separate channels. HSL when you want to adjust lightness or saturation by hand, because the numbers mean something you can reason about.
Can I pull colours out of a screenshot?: Yes — that is the common use. Upload the screenshot and sample any pixel in it.
What formats does it give me?: HEX, RGB and HSL, plus a ready CSS custom property. Any of them copies with one click.
Can I build a palette from a photo?: Yes. Keep each colour you sample and the palette builds up beside the image, ready to copy.