How logins with biometric information work

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You can log in with the biometric information (e.g. face, fingerprint) registered to your main device when you use LINE on some sub devices. Since an email address or password doesn't need to be entered, it helps prevent unauthorized logins by third parties.

Setting up biometrics

To log in using biometrics on a sub device, you need to set up biometrics on a main device that meets our system requirements.

Registering your biometrics

  1. Register Face ID or Touch ID to your iPhone.
  2. Go to your device's Settings > Apps > LINE and turn on Face ID or Touch ID.

Setting up biometrics in LINE

  1. Open LINE on the main device your LINE account is registered to.
  2. Tap the Home tab > Settings > Account.
  3. Tap Face ID or Touch ID > Enable.
  4. Check that Unlink appears next to Face ID or Touch ID.

Logging in with biometrics

You can use this feature with iPad, Windows, and Mac sub devices.

Log in on your sub device using the biometrics you registered to your main device beforehand.

First login

  1. Start LINE on your sub device.
  2. Select Log in with my smartphone.
  3. Enter the phone number registered to your LINE account and click Log in with smartphone.
  4. Click Show verification code.
  5. Start LINE on your main device.
  6. Tap the Home tab > Settings > Account > Pair a new device.
  7. Enter the verification code that appears on LINE on your sub device into LINE on your main device.
  8. Authenticate the login with biometrics on your main device when prompted to do so.

Future logins

  1. Start LINE on your sub device.
  2. Select Log in with my smartphone.
  3. Enter the phone number registered to your LINE account and click Log in with smartphone.
  4. Start LINE on your main device.
  5. Authenticate the login with biometrics on your main device when prompted to do so.

Turning off logins with biometrics

  1. Open LINE on the main device your LINE account is registered to.
  2. Tap the Home tab > Settings > Account.
  3. Tap Face ID or Touch ID > Disable.

When you disable biometrics for logging in to LINE on your main device, you will be logged out of LINE on any sub devices you're using. To use your account on a sub device again, log in with your email address and password or with a QR code.