Image Compare

Threshold 0 detects any change in premultiplied color or opacity. Hidden colors in fully transparent pixels are ignored. This is a pixel count, not a perceptual similarity score.

Large images are sampled to at most 2 megapixels and 2048 pixels per side. Results and PNG export describe this resized comparison, not the full-resolution originals.

Dimensions differ. Images are aligned at the top-left; extra area is transparent.

The browser decodes colors to canvas pixels. Animated images use one decoded frame.

Pink pixels exceed the threshold. Unchanged pixels appear in pale gray.