The things you keep
Saved on this device — never uploaded, never synced, never counted. Everything here also works with no connection at all.
Bookmarks, saved work and recent tools, in one pile on this device.
On this device
The browser does not report how much this site is storing.
Install as an app
Chrome and Edge offer to install Zellio after you have used a couple of tools; the offer appears at the bottom-left. Installed or not, everything stays on this device.