Image Compare & Diff Pro-ready
Compare two images with a slider, overlay, or pixel diff. Exact diff requires matching dimensions.
Choose images
Image A
No image selectedImage B
No image selectedYou can also drag and drop files here.
Files are processed in this browser. File contents and names are never uploaded or saved in browser storage.
Advanced settings
Result
Fit shows the whole image; 100% shows original detail. Select the Pan tool to drag the view. On a desktop, you can also hold Space or use right-drag. The image context menu is disabled inside the viewer.
About the diff ratio
The diff ratio is not a quality score. It counts pixels where any RGBA channel differs by more than the threshold. Compression, antialiasing, or a one-pixel shift can increase it. Colors are compared as decoded by the browser.
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How to use
Choose image A and image B, then select a comparison view. In Slider view, A is on the left and B is on the right.
About this tool
Visual comparison uses the original images. Pixel diff runs at full or reduced resolution according to a memory estimate, and the result identifies the mode. The changed ratio counts pixels where any RGBA channel exceeds the threshold; it is not a quality score. Images of different dimensions support visual comparison only.
Tested for creative and professional checks with high-resolution images. Processing stays in your browser and leaves the original files unchanged.
Images must be within 80 MP and a 12,000 px long edge, with up to 200 MB per file and 400 MB per pair. Even within these limits, supported sizes and processing time depend on your computer, browser, and available memory.
Frequently asked questions
Will this change the original files?
No. Results are saved as new files; the originals are unchanged.
Are my files uploaded?
Processing takes place in your browser. Closing the page discards your work.