Image Difference Checker

Load two images locally, compare matching dimensions or explicitly normalize B to A, inspect changed-pixel percentage and mean channel difference, and download a heatmap without uploading either image.

Image A

Image B

Difference threshold16

Dimension handling

For pixel-meaningful regression checks, use images with identical dimensions. Scaling B changes pixels and makes the comparison visual rather than exact.

—Changed pixels

—Mean abs difference

—Compared size

—Mode

Load two imagesDifference heatmap highlights pixels above the selected threshold.

What this tool does

Compare two images locally with threshold-aware pixel statistics and an exportable heatmap.

Production guidance

Use exact dimensions for meaningful pixel comparison or explicitly normalize B to A when you only need a visual regression-style comparison.

Privacy

Your selected images are processed in the browser by this tool unless the page explicitly says otherwise.