Questions
Does eBay need square photos?
No. Any shape works, but square photos fill the gallery tile neatly. The square preset adds white borders instead of cropping.
Is my photo uploaded to a server?
No. The resizing runs inside your browser with JavaScript, so the image stays on your device. Nothing is uploaded unless you choose to share it with "Share by link" in the Download step. Once the page has loaded, resizing keeps working even if you go offline. If your device can't handle an image, the tool can shrink it on our server instead, but only if you agree, and it is deleted right away.