Ending a session on purpose

Closing a tab removes something from your screen and may clear some local state. It does not tell the service anything. As far as the service is concerned, you simply stopped making requests, which is indistinguishable from you making a cup of tea.

Signing out tells the service to stop treating you as signed in. That is a change on their side, it happens when you ask for it, and it does not depend on how long anything would otherwise have lasted.

The gap between the two actions is a period where the service still considers a session live and you have stopped paying attention to it. How long that period lasts is unknown, as the panel on session length explains at some length, and unknown is the whole problem.

Signing out replaces an unknown duration with a known one. That is not a dramatic improvement in any particular case, and it is a consistent improvement in every case, which over a long time is the more valuable kind.

• It is at the end, when you have finished and your attention has already left.
• It is one extra action after the thing you actually came for.
• Nothing goes wrong when you skip it, most of the time, so there is no feedback teaching you to do it.
• Closing a tab feels final. The feeling is doing the work that the click should be doing.

The version that works for most people is to attach it to something rather than to remember it. Sign out as the last step of whatever you came to do, before closing anything, in the same motion.

The version that does not work is deciding to be more careful. This is a small habit competing with the strong feeling of having already finished, and intention loses that competition reliably.

It does not clear your machine. Everything on the panel about what stays behind is unaffected, including anything you saved, copied or screenshotted.

It does not undo anything you did. An action taken during a session stays taken, and signing out afterwards is not a way of stepping back from it.

And it does not stop the address existing on your machine, which is the item most likely to still be there long afterwards.

Word count, share of the whole board, reading time, and a line of every panel length in this section. There is nothing about signing out that this site could measure, and there is no honest way to put a figure on how often people do it.

Every one of these tiles is checkable from the page in front of you, which is the standard the board applies everywhere. A panel where the interesting number is unavailable shows the available ones rather than reaching for something plausible.

Advice like this is usually delivered with more weight than it deserves. Sign out every time, or something terrible will happen. That framing is common and it is wrong in both directions.

It is wrong because it overstates the size of the effect in any single case, which readers can tell, and once a reader catches you overstating one thing they discount everything else you said. It is also wrong because it understates the reason: the point is not danger, it is replacing an unknown with a known, which is a much duller argument and a much more durable one.

The board would rather make the duller argument. A habit adopted because the reasoning holds survives longer than one adopted because a page sounded alarmed, and it does not collapse the first time nothing bad happens after skipping it.

Does signing out on one device affect another?

That depends entirely on the service and is not something this board can observe or tell you.

Is closing the browser as good as signing out?

It may clear local state. It does not communicate anything to the service, which is the part signing out does.