A real multi-image favicon.ico, the PNGs Apple and Android expect, the manifest entries and the markup to paste into your head. Every pixel is drawn on your device — an icon is a brand asset, and it shouldn’t need a stranger’s server to exist.
The tool reads the file’s actual contents to work out what it is — no need to tell it, and a wrong file extension won’t fool it.
Your browser does all the work locally. Nothing is uploaded — the file never leaves your machine, so there’s nothing for anyone to store, scan, or leak.
You see the real numbers — sizes, dimensions, durations — and save the file. Close the tab and nothing of your file remains.