Image Comparison Tool

Compare two images side by side free online with a slider and real pixel-difference highlighting. See exactly which pixels changed between two versions of an image.

Upload both images to compare

Browser only -- images never uploaded anywhere.

How to Use This Tool

1
Upload both imagesA and B
2
Choose slider or pixel difference modeDifferent ways to compare
3
Inspect the resultDrag the slider, or review highlighted differences

Genuine Pixel-Level Comparison, Not a Visual Guess

The difference view directly compares each pixel's RGB values between both images after drawing them to matching canvas dimensions -- any pixel exceeding a difference threshold gets flagged, a real computational comparison rather than relying on the eye to spot changes.

Two Complementary Comparison Modes

The slider mode is easy-to-use for visually comparing layout, color, or composition changes by dragging to reveal one image over the other. The pixel difference mode specifically highlights exactly where the two images differ at the pixel level, catching subtle changes a slider comparison alone might not make obvious.

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Frequently Asked Questions

Both images are drawn to canvas at matching dimensions, then each pixel's RGB values are compared directly -- any pixel exceeding a difference threshold gets highlighted in the difference view, giving a genuine pixel-level comparison rather than a visual approximation.
Both images are scaled to the same dimensions for comparison purposes, since pixel-by-pixel difference calculation requires equal dimensions -- keep in mind that scaling itself can introduce minor differences unrelated to the actual content changes.
The slider view lets you drag to reveal one image versus the other at the same position, useful for visually comparing layout or color changes. The difference view specifically highlights pixels that changed, useful for catching subtle modifications a slider comparison might not make obvious.
Pixel-level comparison catches even small color or compression artifact differences invisible to casual visual inspection -- useful for verifying an image truly didn't change, or for catching unintended compression artifacts introduced during editing or export.
Verifying a design revision actually matches intended changes, checking before/after photo edits, or confirming an image export process didn't introduce unwanted visual artifacts.
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