Does it require the two images to be exactly the same dimensions?

For an accurate pixel comparison, yes — significantly different dimensions between the two images will produce a less meaningful diff.

How are the differences shown?

Differing pixels are highlighted visually, making it easy to see exactly where and how much the two images diverge.

Can this catch very subtle changes, like a 1-pixel shift?

Yes, pixel-level comparison catches even small differences that would be very hard to spot by eye in a manual side-by-side look.

Does Image Diff Checker upload my files to a server?

No. Image Diff Checker runs entirely in your browser using on-device processing, your files never leave your device.

Image Diff Checker

Highlight the pixel differences between two images.

Runs in your browser

Drop the first image here

Choose File

Drop the second image here

Choose File

Sensitivity

About this tool

Spotting exactly what changed between two versions of an image — a design revision, a before/after edit, verifying an automated image process — is slow and unreliable by eye, especially for subtle pixel-level changes. This tool highlights the pixel differences between two images directly, showing you exactly what changed instead of relying on a manual side-by-side comparison.

Frequently asked questions

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