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Compare images

Put two images side by side: drag a divider to compare, view them synchronised side by side, overlay them translucently, or look at a per-pixel difference map. Images are never uploaded; comparison and export run locally.

🔍 Good forbefore/after retouching, before/after compression, two versions. Both images are decoded and composited in your own browser,Never uploaded, and the page makes no external requests either. The difference image treats transparent pixels as white.
Drag images here or click to choose
Image A · original
Drag images here or click to choose
Image B · comparison
The comparison view appears once both images are loaded; click a drop zone to replace that image. Large images are scaled down to what the browser canvas can handle.

How to use

  1. Import A (the original) and B (the one to compare)
  2. Choose a mode: slider, side by side, translucent overlay, or per-pixel difference
  3. Drag the divider or adjust the gain, then export the composite or the difference image

FAQ

What if the two images differ in size?
By default they are centred on the larger canvas without stretching; untick Auto-align to stretch B to A's size instead.

Why does the difference image look too bright or too dark?
It shows |A−B| multiplied by the gain slider; extreme differences clamp at the maximum.

Everything runs locally in your browser — files are never uploaded. BoxKit VIP unlocks unlimited use of all 29 tools.