Image Compare Slider

Compare two images side by side or with a slider

Spotting the difference between two versions of an image is hard when you flip between tabs. An image compare slider stacks both images in the same frame and reveals one over the other as you drag a handle across, so even subtle changes in color, sharpness or compression jump out. This tool also offers a classic side-by-side view when you want to see both pictures at full width at once. Both modes render instantly as you change images or drag.

Everything runs in your browser. The two images are decoded onto a canvas and drawn locally, so nothing is uploaded and your work stays private. When the images differ in size, the second is scaled to match the first so the slider lines up edge to edge. This makes it perfect for checking photo edits, retouching, AI upscaling, JPG compression levels and design revisions without sending files anywhere.

When a comparison slider helps

Use the slider to prove a before-and-after edit to a client, to judge how much detail a compression setting removed, or to confirm a background removal looks clean against the original. Designers compare two layout variants, photographers check raw versus retouched frames, and developers verify that an optimization did not visibly degrade an asset. Because the handle moves smoothly, you can park it anywhere to inspect a specific region in detail.

Tips for an accurate comparison

For the truest comparison, export both images at the same dimensions and the same crop so only the real differences remain. Line up the same subject in both shots; even a small shift can look like a change when it is only movement. Use the side-by-side view to read both images as a whole, then switch to the slider to scrub across a tricky area. Everything updates live, so swap either image at any time to compare a new pair.