Images

Image diff

Overlay two images and inspect changed pixels.

Files are processed in this browser.

Image diffPolishTools

Choose image Choose second image

Drop a file or choose one. You can also paste an image.

JPG · PNG · WebP / up to 40 MB and 16 MP / no animation or rotation metadata

Settings Difference threshold (0–255) 0 Preview mode Second image opacity

Preview

Choose a file to begin.

How to use the tool

Select two files

Choose the first and second images. Their names and dimensions appear above the preview.
Overlay and compare

Adjust the second image opacity to inspect alignment. Set a difference threshold and generate the result.
Inspect changed pixels and PNG

Red pixels exceed the threshold. Check the changed count and percentage, then download the difference PNG.

Before you export

Comparison uses decoded pixels

The comparison uses visible RGB and alpha differences. Hidden RGB differences in fully transparent pixels are ignored. With a zero threshold, small changes from re-encoding a JPEG can still appear as differences.

Different sizes align at the top-left

The canvas uses the larger width and height. Missing areas count as differences. The tool does not guess alignment, shift images or stretch them to match.

Current limitations

JPG · PNG · WebP / up to 40 MB and 16 MP / no animation or rotation metadata
Dimensions must be positive integers, up to 8,192px per edge and 16 MP.
The combined comparison canvas must also fit 8,192px per edge and 16 MP.
At threshold 255, even the maximum difference is hidden. Zero shows any visible difference.
This is pixel comparison, not semantic comparison of objects or text.