Align
Center, offset, or crop both screenshots without silently stretching either image.
Free · no signup · browser editor
Screenshot Diff & Share
Align two page states, highlight what changed, add review notes, and download or share the comparison.
1 · Add screenshots
Before and after
BeforeOriginal screenshot
AfterChanged screenshot
Editing and downloads stay in this browser. Images are uploaded only if you choose Share; the link is unlisted.
How the comparison works
Align, annotate, and export the comparison.
Explain
Choose a comparison view and add arrows, boxes, captions, or privacy blur.
Share
Download PNG, GIF, or PDF locally, or explicitly publish an unlisted recipient link.
Questions
Screenshot diff FAQ
Are my screenshots uploaded?
Not while you edit or download. Images leave your browser only if you explicitly choose Share. That action uploads optimized copies so recipients can view the comparison from an unlisted link.
What does the sensitivity control do?
It changes how much color difference a pixel needs before it is counted. Higher sensitivity catches subtle anti-aliasing and compression changes; lower sensitivity focuses on larger visual changes.
Can I compare only one part of a screenshot?
Yes. Choose Crop, drag over the preview, then press Crop in the property bar. You can undo or redo the crop like any other edit.
What happens when the screenshots have different sizes?
Start from top-left or centered alignment, then move the After screenshot horizontally or vertically and crop to the matching page area.
Are published comparisons searchable?
No. Published comparisons use a long random URL and are marked noindex. Anyone who receives that link can view it, so blur sensitive areas before publishing.