Upload two images to compare them.
Why an Image Diff Checker?
Pixel-Level Image Compare
Compare two images pixel by pixel and adjust sensitivity to ignore JPEG noise, compression artifacts, or tiny anti-aliasing changes.
Five Visual Modes
Slider reveals A on one side and B on the other. Onion-skin fades between them. Difference overlays a red heat-map. Flip cycles between A and B. Side-by-side puts them in a grid.
Stays in Your Browser
Images are decoded and compared on your device. Nothing is uploaded to a server. Large files are streamed to the browser-private filesystem so they never sit in memory.
Built for Big Images
Efficient browser comparison keeps large screenshots, design exports, and high-resolution images responsive without a desktop app.
Image Diff FAQ
What is an image diff checker?
An image diff checker compares two images and highlights changed pixels, making it easier to review screenshots, UI mockups, design exports, charts, and generated images.
How do I compare two images online?
Upload the original image and the modified image, then choose slider, onion-skin, side-by-side, difference overlay, or flip view to inspect the changes.
What image formats are supported?
Image Diff supports PNG, JPG/JPEG, WebP, AVIF, GIF, and BMP files.
Are my images uploaded to a server?
No. Images are decoded and compared in your browser, so uploaded image files stay on your device.
Can I use image diff for visual regression testing?
Yes. It is useful for checking screenshot changes, layout shifts, rendered UI differences, exported designs, and before/after image updates.