Why Does Gmail Keep Signing Me Out?
Last Updated on August 25, 2026 by Shaks George
In short: Gmail signs you out automatically when cookies are cleared on browser close, when a security setting or a third-party cookie block stops the session token being stored or when Google forces a re-authentication after a suspicious sign-in. Allowing cookies for mail.google.com and turning off “clear cookies on exit” fixes most cases.
- Why Gmail signs you out automatically
- Fix 1: allow cookies for mail.google.com
- Fix 2: stop cookies clearing when you close the browser
- Fix 3: check for a forced sign-out after a suspicious login
- Fix 4: extensions that strip session cookies
- Why it happens on mobile but not desktop
- Is this a sign my account is compromised?
- Frequently asked questions
Why Gmail signs you out automatically
Being logged out mid-task is almost always a cookie or session problem, not a bug in Gmail. The usual triggers are:
- The browser is set to clear cookies and site data every time it closes.
- Third-party cookies are blocked, which stops Gmail storing the session token.
- A privacy extension or a “clean on exit” tool wipes the session between visits.
- Google forced a re-authentication after spotting a sign-in it did not recognize.
- An outdated browser or a shared and public device where inactivity signs you out.
Senior Analyst, Corbett Software
“Nine times in ten this is one setting: the browser is throwing your cookies away on exit. Allow cookies for mail.google.com, turn off clear-on-close and the sign-outs stop. Only reach for account recovery if Google itself signed you out over a security flag.”
Fix 1: allow cookies for mail.google.com
Gmail keeps you signed in with a session cookie. If cookies are blocked, the login cannot stick. Add Gmail as an allowed site:
- Chrome: Settings → Privacy and security → Third-party cookies → under “Sites allowed to use third-party cookies” click Add and enter [*.]google.com.
- Edge: Settings → Cookies and site permissions → Manage and delete cookies and site data → Allow → Add [*.]google.com.
- Firefox: Settings → Privacy & Security → Cookies and Site Data → Manage Exceptions → allow https://google.com.
- Safari: Settings → Privacy → uncheck Block all cookies.
Fix 2: stop cookies clearing when you close the browser
This is the single most common cause. If the browser wipes cookies on exit, Gmail logs you out every session.
- Chrome: Settings → Privacy and security → Third-party cookies, then turn off Clear cookies and site data when you close all windows. If you want to keep clearing others, add google.com as an exception instead.
- Firefox: Settings → Privacy & Security → History, then uncheck Delete cookies and site data when Firefox is closed. You can also add google.com as an exception.
Fix 3: check for a forced sign-out after a suspicious login
If cookies are fine but Google keeps logging you out, it may be protecting the account. Open Gmail, scroll to the bottom and click Details under Last account activity to review recent sign-ins, then sign out any device you do not recognize. If something looks wrong, follow the steps to secure a Gmail account from hackers and turn on stronger verification.
Fix 4: extensions that strip session cookies
Privacy extensions, ad blockers and “auto-clean” tools can delete the Gmail session between page loads. Open the browser’s Extensions page, turn them off, then reload Gmail. If the sign-outs stop, re-enable the extensions one at a time until you find the one at fault, then whitelist mail.google.com inside it.
Why it happens on mobile but not desktop
On a phone the Gmail app holds the session itself, so a browser cookie setting cannot log you out. When the app signs you out, the cause is usually a stale app version, an account sync that failed after a password change or battery-saver killing the app in the background. Update the app, remove and re-add the account and exclude Gmail from battery optimisation. The reverse is true on desktop, where the browser and its cookie rules are almost always the reason.
Is this a sign my account is compromised?
On its own, no. A repeated sign-out is far more often a cookie or browser setting than a break-in. It is worth a second look only when it comes with other signals: sign-ins from places you have never been, changed recovery details or unfamiliar devices in Last account activity. If you see any of those, change the password, sign out of every session and set up two-step verification on Gmail. If none of them appear, treat it as the cookie problem it almost certainly is.
Back up your Gmail in case you lose access
A forced sign-out can turn into a full lockout while Google verifies the account. Recovery can take days. A local copy means a lockout never costs you your old mail.
The Corbett Gmail Backup Tool saves your Gmail messages, contacts and calendars to your computer as PST, PDF, MBOX or EML, with the folder structure and attachments intact. A free demo edition runs on every edition of Windows.
Frequently asked questions
How do I stop Gmail signing me out on Chrome?
Allow cookies for google.com and turn off “Clear cookies and site data when you close all windows” under Settings → Privacy and security → Third-party cookies. That keeps the session cookie between visits, which is what stops the sign-outs.
Why does Gmail keep signing me out on my phone?
The app holds its own session, so this is usually a stale app version, a sync that failed after a password change or battery-saver closing the app. Update the app, re-add the account and exclude Gmail from battery optimisation.
Does staying signed out mean my account was hacked?
Rarely. It is almost always a cookie or browser setting. Treat it as a security event only if you also see unknown sign-ins, changed recovery details or devices you do not recognize in Last account activity.
Why did Google block my Gmail account?
Google can temporarily block an account, often for about 24 hours, when it detects unusual activity. Verify your identity through account recovery and turn on two-step verification to reduce future locks.
Can incognito mode cause Gmail to sign me out?
Yes. Incognito and guest windows discard cookies when they close, so Gmail will not remember the session. Use a normal window for an account you want to stay signed in to.
