Pull the main colors out of any image. It downscales the picture, buckets colors by frequency and shows the dominant ones as copyable hex swatches.
No. Colors are sampled from a canvas in your browser — the image never leaves your device.
Pixels are quantized into color buckets and the most frequent buckets become the palette, so you get the dominant tones.
Quantization groups near-identical colors together, which keeps the palette compact and representative rather than noisy.