# How to sign in to multiple Gmail accounts at once > Sign in to multiple Gmail accounts at once with Add account under your profile picture. For two inboxes side by side, open each in its own browser profile. Source: https://mosaicbrowser.com/guides/sign-in-to-multiple-gmail-accounts-at-once ## How to sign in to multiple Gmail accounts at once To sign in to multiple Gmail accounts at once on a computer, click your profile picture at the top right of Gmail, choose Add account and sign in; the same menu switches between them. In the Gmail app, tap your profile picture, then Add another account. ![Two Gmail inboxes, open at once, beside a screenshot: six Mosaic profile windows arranged in a grid, each with its own name in the title bar](https://mosaicbrowser.com/covers/sign-in-to-multiple-gmail-accounts-at-once.webp) Google built signing in to multiple Gmail accounts at once into Gmail itself. On a computer you add a second account from the menu under your profile picture, and from then on both stay signed in until you sign out. That covers most people. The two cases it handles badly are links that open in the wrong account, and accounts that belong to different people. Having several accounts is ordinary as far as Google is concerned: it documents the steps to sign in to them together. Its Gmail Program Policies draw the line at using multiple accounts "to engage in a behavior that was previously prohibited" ([Gmail Program Policies](https://support.google.com/mail/answer/16734397?hl=en), read 2 November 2026). Mosaic keeps accounts you are entitled to run apart; it does not change what a platform allows. ## How to sign in to multiple Gmail accounts at once on a computer These are Google's steps from [Sign in to multiple accounts at once](https://support.google.com/accounts/answer/1721977?hl=en) (read 2 November 2026): 1. Open Gmail and sign in to your first account. 2. At the top right, select your profile picture or initial. 3. Choose **Add account**. 4. Sign in to the second account. Repeat for a third. To switch, open the same menu and pick an account. Each one opens in its own tab with `/u/0/`, `/u/1/` and so on in the address, so you can keep two tabs open, one inbox in each, and both stay live. ### Which account is the default The account you signed in with first is usually your default. Google says that when it "can't tell which account you're using", for example when you open a new window, it may fall back to the default account and apply its settings, such as Web & App Activity and Ads Personalization. That is why a link from a calendar invite or a Docs share sometimes lands in the wrong inbox. If one account is the one you use most, sign out of everything and sign in to that one first. ### Signing out Signing out is not per account in the same way. The menu offers **Sign out** or **Sign out of all accounts** ([Sign out of or remove your account from Gmail](https://support.google.com/mail/answer/8154?hl=en), read 2 November 2026). To drop one account from the list for good, go to myaccount.google.com, open the same menu, choose **Sign out**, then **Remove an account**. Mosaic is a desktop app Email yourself the link and open it on your computer. [How it works: Local first](https://mosaicbrowser.com/features/local-first) ## In the Gmail app On Android, Google's steps are: open the Gmail app, tap your profile picture in the search bar, then **Add another account** › **Google** ([Add another email account in the Gmail app](https://support.google.com/mail/answer/6078445?hl=en), read 2 November 2026). The same screen adds Outlook, iCloud Mail or Yahoo. Once two accounts are in the app, Menu › **All inboxes** shows them in one list. Notifications come from every account. In the app there is no sign-out button; you remove an account from the device under **Manage accounts on this device**. ## A private window as a second session A private or incognito window keeps its own cookies, so you can sign in to a second Gmail account in it without touching the first. Google's devices page lists signing in "on an incognito or private browser window" as one of the things that creates a separate session in your account history ([See devices with account access](https://support.google.com/accounts/answer/3067630?hl=en), read 2 November 2026). The catch is that everything is forgotten when the window closes, so you sign in, and pass two-step verification, every time. ## When the accounts should not share a browser Every method above keeps all your accounts in one browser on one computer. For your personal and work Gmail, that is the whole point. It is different when the accounts belong to separate clients, or to a team where each account has its own owner. A page signed in to one account reads the same machine as a page signed in to the next: the same screen, graphics card, fonts and timezone, and the same internet address. The values a page can read are listed in [browser fingerprint](https://mosaicbrowser.com/glossary/browser-fingerprint). In Mosaic each Gmail account gets its own profile, and each profile is its own browser with its own cookies, fingerprint and proxy exit. Signing in to two accounts at once then means two windows, side by side: 1. Click **New profile** and name it after the account, for example "Client A - Gmail". 2. On the **General** tab, choose a proxy, or paste one, if this account should browse from a set place. Mosaic checks it before every launch and refuses to open the profile behind a proxy that has not answered. 3. Make a second profile the same way for the next account. 4. Start both and sign in to one account in each window. ![Six Mosaic profile windows arranged in a grid, each with its own name in the title bar](https://mosaicbrowser.com/shots/windows-arranged.png) *Each window is one profile, signed in to one account* ![Creating a profile in Mosaic: a checked proxy, and the hardware and locale drawn to match its exit](https://mosaicbrowser.com/shots/profile-editor.png) *A new profile, its proxy checked before it is saved* The cookies for each account stay in its profile, so closing a window and starting it again tomorrow usually finds the account still signed in, the way a browser you closed overnight would. Profiles, cookies and proxies stay on your computer; how that works, and what our server does know, is on [local first](https://mosaicbrowser.com/features/local-first). The four ways to keep many Gmail accounts in order, with mail fetching and delegation, are compared in [how to manage multiple Gmail accounts](https://mosaicbrowser.com/guides/manage-multiple-gmail-accounts). ## Sources 1. [Google Account Help: Sign in to multiple accounts at once](https://support.google.com/accounts/answer/1721977?hl=en), read November 2, 2026 2. [Gmail Help: Add another email account in the Gmail app](https://support.google.com/mail/answer/6078445?hl=en), read November 2, 2026 3. [Gmail Help: Sign out of or remove your account from Gmail](https://support.google.com/mail/answer/8154?hl=en), read November 2, 2026 4. [Google Account Help: See devices with account access](https://support.google.com/accounts/answer/3067630?hl=en), read November 2, 2026 5. [Gmail Help: Gmail Program Policies](https://support.google.com/mail/answer/16734397?hl=en), read November 2, 2026 ## Questions ### Is there a limit to how many Gmail accounts I can be signed in to at once? Google's help page on signing in to multiple accounts, read on 2 November 2026, does not state a number. In the Gmail app you can add Gmail and non-Gmail addresses side by side and read them in All inboxes. ### Why does Gmail open the wrong account when I click a link? With several accounts in one browser, Google says it sometimes cannot tell which one you mean and falls back to your default account, which is usually the one you signed in with first. Signing in to that account first, or giving each account its own browser profile, avoids it. ### If I sign out of one Gmail account, am I signed out of all of them? On a computer, the menu under your profile picture offers both Sign out and Sign out of all accounts, and the second one signs out every account in that browser. In the Gmail app you remove an account from the device instead of signing out. ### Can I have two Gmail accounts open in two windows at the same time? Yes. In one browser, the address of each tab carries the account number, so two tabs can show two inboxes. For two windows that never mix cookies, use two browser profiles. ## Related [How to manage multiple Gmail accounts](https://mosaicbrowser.com/guides/manage-multiple-gmail-accounts): Manage multiple Gmail accounts with the account switcher, a Chrome profile per account, mail fetching or delegation. Each shares something different. [How to manage multiple accounts without getting them linked](https://mosaicbrowser.com/guides/how-to-manage-multiple-accounts-without-getting-linked): Accounts get linked by shared cookies, IPs, fingerprints and habits. Give each its own profile, exit and history, then test it before you trust it. [Browser fingerprint: what a site can read about your machine](https://mosaicbrowser.com/glossary/browser-fingerprint): A browser fingerprint is the set of values a site reads about your browser and computer, which together recognize you without cookies. What goes into one. [Local first: your profiles stay on your computer](https://mosaicbrowser.com/features/local-first): Mosaic has no cloud copy of your profiles. Profiles, cookies and proxies stay on your computer, encrypted on disk, with app lock, daily backups and a trash. [Provider accounts: one gateway line, one exit per profile](https://mosaicbrowser.com/features/proxy-providers): Paste your proxy seller's gateway line once and Mosaic mints a separate session for every profile, so each one browses from its own exit address.    ## Run this guide on your own accounts Every Mosaic profile is a fingerprint, a proxy exit and a cookie jar that agree with each other, kept on your computer. Free holds 3 profiles. Pro is $49 a month for any number. Mosaic is a desktop app Email yourself the link and open it on your computer.