Reproduction.

Sign out of Google

Sign out (Android)

This information is for the Gmail app for Android 4.0 and up.
There’s no option to sign out of the Gmail app for Android without removing your entire account from your phone or tablet.
However, you can accomplish many of the same tasks through other actions, depending on what you need.

I want to check mail from another account

If your device is running Android 5.0 or higher, there's an easy way to let a guest use your device.
If you want to read mail from another account, or a friend wants to check email on your phone, you don’t have to sign out — you can just add another account.
Keep in mind that when you add an account to your phone, you can easily switch between accounts without having to enter the password again.
If a friend adds an account to your phone to check email, be sure to remove the account afterward (see steps in section below).
Or, you could also use the browser on your phone to go to mail.google.com and check your email from there.
I want to protect my email
If you’re worried about losing your phone or having someone read your mail, you can password-protect your device. Here’s how to set a screen lock on a Nexus device — other types of phones or tablets will have similar instructions.
Tip: If you ever lose your phone, you can remove access to all Google services (Gmail, Maps, YouTube, etc.) on that phone. If you later find your phone, you'll just need to sign in with your username and password before you can use Google services on it. Learn more about account permissions.
I want to preserve data, storage, or battery life
You don’t have to sign out of Gmail to save power on your phone. To help optimize data usage, device storage, or battery life, you can adjust your sync settings.

Choose which labels to sync

1. Open the Gmail app.
   
2. Touch the menu.
   
3. Select Settings.
   
4. Choose an account.
   
5. Touch Manage labels.
   
6. Touch a label.
   
7. Touch Sync messages.
   
8. Choose Sync: None, Sync: Last 30 days, or Sync: All.
   

Choose how many days of mail to sync

1. Open the Gmail app.
   
2. Touch the menu.
   
3. Select Settings.
   
4. Choose an account.
   
5. Touch Days of mail to sync.
   
6. Select the number of days.
   
7. Touch OK.
   

Turn off Gmail sync

If you turn off Gmail sync, new messages will stop syncing automatically.

1. Open the Gmail app.
   
2. Touch the menu.
   
3. Select Settings.
   
4. Choose an account.
   
5. Uncheck the box next to Sync Gmail.
   

Touch the Refresh icon while viewing your inbox to sync your messages manually.

Remove downloaded messages

1. Open your device’s Settings app.
   
2. Touch Apps, and then Gmail.
   
3. Touch Clear data.
   

This will clear the data on your Gmail app. Accounts that have Gmail sync turned on will start syncing immediately. Accounts with Gmail sync turned off will not sync automatically.

Use Gmail on your mobile browser

You can also access Gmail by going to mail.google.com on your mobile browser.
If none of these situations apply to you, you can also remove your account from the entire device. Don't worry, removing the account from your device won't delete the account itself—just remove it from your phone or tablet.

Remove an account