Image Compare

Image Compare places two versions of an image on top of each other behind a draggable reveal slider, so you can wipe back and forth to see exactly what changed between them. As you move the handle left and right, one image is clipped to expose the other underneath, giving an immediate, pixel-aligned before-and-after view that side-by-side thumbnails can never match.

This is the standard way to evaluate lossy operations: load an original photo on one side and a compressed, resized, retouched, or filtered version on the other, then sweep the slider to spot compression artifacts, banding, sharpening halos, or color shifts. Because both images are layered in the same frame, your eye doesn't have to jump between two panels, which makes subtle differences far easier to catch.

The tool runs locally in the browser, so neither image is uploaded — useful when comparing client work, unreleased designs, or sensitive screenshots. It pairs naturally with optimization workflows: export a candidate from an image compressor or the Social Image Resizer, drop both versions in here, and confirm the quality is acceptable before you ship. Designers also use it for retouch approvals and photographers for evaluating RAW-versus-export differences.

Practical tips: make sure both images share the same dimensions and framing so the slider lines up meaningfully — a shifted crop will read as a 'change' that's really just misalignment. Zoom into a busy region like foliage, text, or a gradient sky where compression damage shows first, and toggle the slider slowly; rapid wiping hides the very artifacts you're hunting for.