Compare two images pixel by pixel in your browser and see exactly what changed. In an AI image workflow it's perfect for checking before/after an inpaint, an upscale, or a re-export (compression) — to confirm only the intended area changed, or to find where the difference is. Load image A (before) and image B (after); the tool computes the maximum per-channel RGB difference for every pixel and draws it in one of three modes. Heatmap colors the magnitude of change from blue → green → yellow → red, so the biggest changes glow red (unchanged pixels stay transparent over a checkerboard). Highlight paints changed pixels magenta over a dimmed copy of B, so you can see the outline of the edited region in context. Raw diff shows the magnitude as white on black, which is best for spotting faint differences. Raise the threshold to ignore small noise (e.g. tiny differences from JPEG re-compression), and raise amplify to make faint changes more visible. The result shows the percentage of changed pixels and the working resolution. If the two images differ in size, B is scaled to A's size before comparing (and the tool says so). The diff image you see can be saved as a PNG. Processing is capped at 2048px on the long side to stay responsive. All computation happens in your browser — the images are never sent to any server or API.