Why closing the tab is not enough
When you sign in to a website, it usually gives your browser a small piece of data, often called a session cookie, that says you are already verified. As long as that data is still there and still valid, the site treats whoever is using the browser as you. Closing a tab, or even the whole browser, does not always remove it. Some sites keep you signed in for days or weeks unless you use the sign-out option.
On your own laptop that is a convenience. On a shared computer it means the next person could open the same site and find your inbox, your photos or your shopping account already open. Most people who use the machine after you will not look, but you cannot count on that. Taking a minute to clean up is the reliable answer.
Sign out of everything you opened
Start with the accounts themselves.
- Use the site’s own sign-out or log-out button, usually found under your profile picture or name. Wait until you see the sign-in page again.
- Do this for every account, including ones you opened by accident, such as a streaming site, a news site or a chat tool.
- If you signed in with a Google, Apple or similar account to reach another service, sign out of the main account too, not only the service you used.
- If a site displays a “keep me signed in” or “remember this device” box, leave it unchecked from the start. If you checked it, signing out usually undoes it, but confirm.
If you opened an email account to read a message, sign out of it last. Email is often the key to resetting other accounts, so it is the one you least want to leave open.
Close the browser properly
After signing out, close all browser windows, including any private ones. Private or incognito windows are designed to discard history and cookies when closed, but only when every private window is closed. Closing just one may leave others holding data.
If you did not use a private window, clear the data from the session before you go. Look in the browser’s settings for options to clear browsing history, cookies and cached files. Choose a time range that covers your session, or “all time” if you are unsure and it is not your own computer. Clearing cookies signs you out of everything on that browser, which is exactly what you want on a shared machine.
Change only your own browsing data, never system settings, and follow any staff instructions.
Check for saved passwords and autofill
Browsers often offer to save passwords and form details. If you said yes, even by accident, the next user could see or use them.
- Look in the browser’s saved passwords area for any entry you did not mean to save and delete it.
- Check autofill data, such as addresses and card details, and remove anything you entered.
- If you used a password manager extension, make sure you locked or signed out of it. Do not install such extensions on a public machine in the first place.
If you are not sure how to do any of this, ask a staff member. Many libraries and business centers reset machines automatically at logoff, but whether theirs does is something to confirm rather than assume.
Look for files and downloads
Documents have a way of staying behind.
- Check the Downloads folder and the desktop for anything you saved or opened.
- Delete those files, then empty the recycle bin or trash if the computer has one.
- If you printed something, collect it from the printer. Forgotten printouts, such as tickets or forms with personal details, are easy for others to pick up.
- If you used a USB drive or any other storage, remove it and check that it is in your pocket, not still in the port.
- If you used cloud storage, sign out of that service too, and confirm no file is still shared with a public link that you created for convenience.
Deleting a file does not always erase it permanently, but it removes the easy route to it. For anything truly sensitive, the better choice was not to save it on the machine at all.
A quick final check
Before you stand up, run through four questions.
- Have I seen the sign-in page for every account I used?
- Are all browser windows closed?
- Have I removed my files, printouts and storage devices?
- Did I decline every request to save a password?
Glance at the taskbar or dock too, and close any program still running that asked for a login.
If you realize you forgot
It happens. If you remember later that you left an account open, act from a device you trust.
- Sign in to the account and look for an option to sign out of all other sessions or devices. Many services offer one in their security settings.
- Change the password afterward. This also ends many sessions and protects you if the password was captured.
- Check recent activity for anything unfamiliar. The signs your email or social account may be compromised are worth knowing here, including unexpected password-reset messages or posts you did not make.
- If you cannot get back in, the process of account lockout recovery applies.
You can also contact the library, hotel or business center and ask them to close the session or restart the computer. They may be able to do that quickly, particularly if you call soon after you leave.
Make it a habit
Treat signing out like taking your keys: something you do every time before standing up. A minute or two removes most of the risk of a forgotten session.