Guide1 min readUpdated July 2, 2026
How to compare two images
Short answer
Load both images into a visual diff tool and it highlights the pixels that changed. This is the reliable way to catch small edits — a moved element, a color shift, a compression artifact — that the eye misses.
Why a visual diff beats the eye
Side-by-side, small changes are easy to miss — a shifted button, a slightly different shade, artifacts from re-compression. A visual diff compares the two images pixel by pixel and highlights exactly what changed, so nothing slips through.
Compare two images
- Add both imagesLoad the original and the changed version. They decode locally.
- Read the highlighted diffChanged pixels are marked so differences stand out at a glance.
- Adjust sensitivity if neededA threshold controls how large a difference must be to count, filtering out noise.
Try it: Visual Image DiffHighlight the pixel differences between two images locally — nothing is uploaded.Open tool
Same dimensions compare cleanlyTwo images of the same width and height align pixel for pixel. If the sizes differ, resize one to match first so the comparison is meaningful. See how to resize an image.
When to compare images
- Checking whether an export changed after compression or conversion
- Reviewing a design change between two screenshots
- Verifying a watermark, edit, or retouch was applied correctly
- Catching subtle artifacts introduced by a tool or pipeline