If Safari keeps asking you to sign in again as you move between tabs, first check that you’re using a regular window, not Private Browsing. Then confirm cookies are allowed and avoid clearing the site’s data. Saved passwords can refill a login form, but they do not keep a website session active. These steps help distinguish a Safari setting from a site that expires or limits its own sessions.

1. Check whether the tabs are in a Private window

In Safari, look at the Smart Search field: a Private window has a dark field with white text. Private Browsing isolates activity between tabs and does not save changes to cookies or website data, so sites may not retain your signed-in state. Open a regular window with File > New Window, then sign in there. Apple documents this behavior in Browse privately in Safari on Mac.

To check whether Safari always starts privately, choose Safari > Settings > General and review Safari opens with. If it is set to A new private window, change it to a regular window option. Apple notes this private-window choice may depend on the macOS setting Close windows when quitting an application; the available choices can vary by system version.

2. Make sure cookies are not blocked

Websites use cookies and other website data to remember a signed-in session. In Safari, choose Safari > Settings > Advanced and make sure Block all cookies is not selected. Apple warns that blocking all cookies can prevent some websites from working properly. Enable cookies in Safari on Mac explains this control.

You do not usually need to turn off Prevent cross-site tracking to keep a site’s first-party login. That setting addresses tracking by third-party content providers; Apple says their data is deleted unless you visit and interact with that provider as a first-party website. If a site’s sign-in flow embeds another service, the behavior may depend on the site’s design, but disabling tracking protection broadly is not a guaranteed fix. See Prevent cross-site tracking in Safari on Mac.

3. Avoid deleting the site’s saved data

Clearing cookies or website data can sign you out because it removes information websites use to recognize a session. If only one site has the problem, inspect Safari’s Privacy settings and Manage Website Data before removing anything; Apple describes this area as showing site data and letting you remove it by site or in bulk. Avoid clearing all data as a first troubleshooting step, since it can sign you out of other sites too.

Safari profiles also keep separate cookies and website data. If you signed in under one profile and open the same site in another, that second profile may not share the session. Switch to the profile where you normally use the site, or sign in there separately. Apple notes that a new profile starts without the cookies and website data needed to remember you; see Use profiles in Safari on Mac.

4. Separate a saved password from a saved session

A password manager or Safari AutoFill can store your username and password and fill them into a sign-in form. It cannot guarantee that the website will keep you signed in between tabs: that depends on the site’s session and cookie behavior. To check AutoFill, choose Safari > Settings > AutoFill and enable User names and passwords. If the password was previously marked “never saved,” open the Passwords app and inspect that site’s entry. Apple gives these steps in Autofill your user name and password in Safari on Mac.

For password availability across your Apple devices, check System Settings > [your name] > iCloud > Passwords > Sync this Mac. This syncs saved login information through iCloud Keychain; it does not preserve an active website session. Apple documents the setting in Set up iCloud Keychain to autofill information on Mac.

5. If Safari still signs you out

Try one regular Safari window and one affected site, without clearing data. If the session lasts in the regular window, Private Browsing was the likely cause. If Safari’s cookie-blocking control was on, turn it off and sign in again. If the issue follows a profile, use the profile that contains the existing site data. When only one site continues to end the session, check its own “remember me” or session options, and contact the site’s support if the setting does not help. Websites can impose their own sign-in limits or expiration rules; Safari cannot promise to override them.

Keep the distinction clear: Passwords and AutoFill remember credentials; cookies and website data support a site’s signed-in session. Check the window type, cookie setting, and profile first, then troubleshoot the individual site without deleting unrelated browsing data.

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