Load two images and compare them with a drag slider or side-by-side view. Perfect for before/after edits. No upload.
Compare two images side-by-side or with an interactive before/after slider, everything runs in the browser, no upload. Drag the divider to reveal how much of each image is visible, making it easy to spot differences between an original and an edited version, or before and after a photo edit.
Because both images stay on your device, you can safely compare confidential documents, medical scans, or sensitive photos without any data leaving your machine.
No. Both images are loaded straight into your browser tab and shown side by side or under a slider, they are displayed from your own device and never processed on or sent to a server. Nothing reaches Sunasty or any third party. Open your browser's DevTools, go to the Network tab and watch: no request carries your images.
Yes. The tool scales both images to fit the display area so you can compare them visually. The original files are not modified.
Yes. The slider supports both mouse drag on desktop and touch drag on mobile browsers.
Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.
It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.