Optional, and always will be. Every tool on Pathine works without one.
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An account records which tools you have used and when — the tool, the file name, the size, the date — and lets you star the ones you keep coming back to.
It also lets you put a finished result on a private link to send to somebody. That is the one time Pathine keeps a file, it happens only when you press the button that says so, and you can delete the link and the file whenever you like.
Nothing else is recorded. Almost everything here runs inside your browser and never reaches a server, which is also why history cannot give you an old result back. It is a log, not a library.