How to Use Google Authenticator for Two-Factor Authentication

Google Authenticator generates 6-digit security codes for your accounts, making them far harder to hack even if someone has your password.

In this guide (5 steps):

1.Download Google Authenticator
2.Enable 2FA on a service and get the QR code
3.Scan the QR code in the app
4.Finish setup on the service
5.What to do if you get a new phone

Download Google Authenticator

~15s

Search "Google Authenticator" in the App Store or Google Play Store. Download and install the free app. Open it — you'll see an empty screen on first launch.

Enable 2FA on a service and get the QR code

~24s

Log into the account you want to secure (for example, Gmail). Go to that account's Security settings and look for "2-Step Verification," "Two-Factor Authentication," or "Authenticator App." Choose the authenticator app option. The service will show you a QR code (a square barcode) on screen.

Quick Tip

Quick Tip: Google, Facebook, Amazon, and most banks support authenticator apps. Look in Security Settings > Two-Factor Authentication > Authenticator App.

Scan the QR code in the app

~18s

In Google Authenticator, tap "+" at the bottom. Choose "Scan a QR code." Point your phone camera at the QR code on your computer screen — the app scans it automatically and adds the account. You'll see the account name and a 6-digit code that refreshes every 30 seconds.

Finish setup on the service

~17s

After scanning, the service will ask you to enter the current 6-digit code to confirm it worked. Open Authenticator, copy the code showing for that account (work fast — you have 30 seconds), and enter it on the service's setup page. The service is now secured with 2FA.

What to do if you get a new phone

~29s

This is important: if you upgrade phones, transfer Google Authenticator before you lose access. In the app, tap your profile icon > "Transfer accounts" > "Export accounts." Scan the QR code with your new phone's Authenticator app. Also save backup codes each service provides during 2FA setup — store them in a safe place.

Warning

If you lose your phone and didn't export Authenticator or save backup codes, you may be locked out of accounts. Always save the backup codes services provide when you enable 2FA.

You Did It!

You've completed: How to Use Google Authenticator for Two-Factor Authentication

Need more help? Get Expert Help from a TekSure Tech

Two-factor authentication (2FA) adds a second layer of security to your online accounts. Most people are familiar with the text-message version — a code gets sent to your phone when you log in. Google Authenticator is an app that does the same thing but generates the codes locally on your phone without needing a signal, making it more reliable and slightly more secure than texts.

Google Authenticator works with hundreds of services: Gmail, Facebook, Amazon, financial accounts, and many more. Once set up with an account, the app shows a 6-digit code that changes every 30 seconds. Even if someone knows your password, they can't log in without that code.

This guide covers setting up the app, adding your first account, and what to do if you get a new phone.

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