Compare two images
Two pictures next to each other, a map of what changed, or a number.
Your file
Drop a file here, or click to choose
It stays on this device. Nothing is sent anywhere.
The first file is the reference, this one is what it gets measured against.
Settings
What each mode is for
- Side by side is for judging quality settings, where seeing both at once beats remembering the first.
- Difference blacks out everything identical and lights up everything changed. This is how you spot a watermark, a retouch, or a compression artefact you could not otherwise see.
- Score gives a single similarity figure, useful for checking whether an export actually changed anything.
Same size helps
Images are scaled to a shared canvas, so different sizes still compare, but a difference map is only precise when both start at the same dimensions. Resize one to match the other first if you need exact results.
Common questions
The difference is completely black.
The two images are identical as far as the pixels are concerned.
Can it tell me if a photo was edited?
It can show you where two versions differ. It cannot analyse a single image on its own for signs of editing.