Select the first image
Drop an image here or click to select
Select the second image
Drop an image here or click to select
A higher threshold requires a larger per-channel change before a pixel is marked as different.
First image
Second image
Load two images and compare their visible content in four views. Pixel difference mode measures changed pixels and creates a downloadable PNG difference image.
Choose a comparison mode
Side by side keeps both originals visible. Slider reveals one image over the other, overlay adjusts transparency, and pixel difference highlights changes above the selected threshold.
Alignment and local processing
Images are aligned at the top-left without stretching, and areas outside a smaller image are transparent. Source images over 25 MB or 20 megapixels are rejected; comparison canvases over 4 million pixels are proportionally reduced. Selected files are not uploaded.
Related tools: Image Resizer · Image Metadata
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