Compare two images using a slider, overlay, side-by-side view or pixel difference heatmap. Align and zoom, measure changed pixels, and save PNG or JPG.
Download your finished file.
Load two images and inspect them with Swipe, Side by side, Overlay or a Difference heatmap. Align the second image to the first, zoom both together and export a single comparison image.
Swipe reveals changes under a divider; Side by side keeps both images visible.
Overlay blends the second image over the first using Reveal / overlay. Difference shows a heatmap of per-pixel RGB changes. The source labels identify A and B. Swipe can be dragged at 100% viewer zoom or controlled with the Reveal slider and arrow keys. Choose a mode before saving; the export follows that mode.
Choose original pixels, fit inside or fill the first image frame.
The first image defines the comparison frame. Original pixels centers the second without scaling. Fit inside preserves all its edges; Fill covers the frame and may crop. Second image scale and horizontal/vertical offsets refine alignment. Offsets are measured in first-image pixels. Content outside the first frame is not included in the measurement.
Viewer zoom enlarges both images together from 100% to 400%.
Drag the enlarged view to pan. Both sides share the same zoom and movement, so the same area stays aligned. Reset view resets viewer zoom, pan and second-image scale and offsets. Viewer zoom changes inspection only; the export includes the full aligned frame.
The statistics show changed-pixel share and mean RGB difference.
A pixel is counted as changed when its largest RGB channel difference exceeds Difference tolerance. Mean RGB difference is the average absolute channel difference expressed as a percentage of 255, independent of that tolerance. Transparent images are composited over white. The label distinguishes actual aligned pixels from a resampled grid. Statistics are capped at 16 megapixels and 8192 pixels per side; larger sources are reduced for responsiveness. These are pixel metrics, not a perceptual similarity or quality score.
Save your selected comparison as PNG or JPG.
Side by side produces a two-panel image; Swipe, Overlay and Difference produce one aligned frame. The comparison grid is bounded to 16 megapixels, so a two-panel export may reach 32 megapixels. PNG preserves the rendered comparison losslessly; JPG offers Image quality. The downloaded result contains the comparison, not editable source layers.
25 MB maximum per file. Up to 2 input files per run.
25 MB per image, up to 32 megapixels and 16,384 pixels per side. Animated inputs use their first still frame.
Image decoding, editing and export run in your browser without AI or uploading the image for processing. The site may use other network services; browser image processing is separate from those services. Refreshing the editor or results page returns to the tool page.
This tool processes and exports files in your browser. The downloaded image is a separate file; the source on your device is not overwritten.
For an image result, use Continue to below the download results to choose a compatible next step. You can select which images to carry over; the next tool starts with its own settings.
Refreshing an editor or download page returns you to the tool page. Download the result before starting a new workflow. See our Privacy Policy for file handling.
A few answers before you get started.
On your deviceIt means the measured aligned pixels do not exceed your tolerance. Files can still differ in metadata, encoding, transparent RGB values or content outside the measured frame. Use zero tolerance to detect every represented RGB difference.
Yes. Choose how the second image fits the first frame and adjust its scale or offset. The interface labels resampled measurements, and anything outside the first frame is excluded.
Lossy encoding can alter small pixel values across the image. Raise Difference tolerance to exclude small channel differences, while remembering that mean RGB difference still reports all measured differences.
No. Viewer zoom and pan are for inspection only. The download uses the full comparison frame in the selected view.
No. The tool computes absolute RGB pixel differences in your browser. It does not use semantic recognition or claim a perceptual similarity score.
Yes. Choose Side by side before Start. It exports both aligned frames into one PNG or JPG image, with twice the comparison grid width. Viewer zoom does not crop it.
