Historically, Google Accounts – including Gmail accounts — have only let people access one account at a time per browser, so using both accounts has been a bit inconvenient. We ’ve either had to sign out and sign back in, use a second browser for my second account, or use a Chrome incognito window.
Now, you can visit Google.com/accounts and click the link next to "Multiple sign-in." After you sign into your first account, you can sign in with up to two additional accounts from the new accounts menu in the upper right hand corner of Gmail, then easily toggle back and forth between them. You can even open multiple Gmail tabs — one for each of your accounts.
Please keep in mind that this is a feature for advanced users, and there are a couple things to watch out for:
1) Not all Google services support multiple account sign-in yet.
2) They ’re still working on making Gmail and Calendar work offline with multiple sign-in. If you rely on offline access, you probably don't want to enable this feature quite yet.
3) Multiple account sign-in only works on desktop browsers for now, so if you use Gmail on your phone's browser you won't see this option yet.
If you use more than one Google Account, we hope this makes you more efficient. If you have any questions, check out our help center.
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