# LINE Login overview

Developer documentation

You're reading the LINE Developer documentation. If you're looking for help using the LINE app, see the Help Center (opens new window).

Integrate LINE Login into your web app or native app to allow users to log in with their LINE accounts.

LINE Login lets users easily create accounts for web apps and native apps with their existing LINE accounts.

LINE Login not only works with native iOS and Android apps but also with web apps and Unity games.

# Introduction

You'll need to create a LINE Login channel regardless of what type of app you're building. To learn more, see Getting started with LINE Login.

# Integrating with web apps

Integrate LINE Login into your web app to make it easier for people to create an account and log in. With LINE Login, your users can automatically log in to your web app if they're already logged in to LINE on their device. The authentication and authorization process is based on the OAuth 2.0 (opens new window) and OpenIDĀ® Connect (opens new window) protocols. For more information, see Integrating LINE Login.

For an example of how LINE Login can provide users with an improved experience, see the LINE STORE (opens new window) website.

LINE Login

# Integrating with native apps

Use our SDKs to add LINE Login to your app and let LINE handle user authentication. When users are logged in to LINE on their mobile device, they're able to log in to your app without entering their email address and password. We offer SDKs for Android, iOS (Swift and Objective-C), and Unity:

The LINE Rangers game, for example, uses LINE Login to let users easily create an account for the game with their LINE accounts.

LINE Rangers 1 LINE Rangers 3

# LINE Login authentication methods

For web app integrated LINE Login, users can use one of the following authentication methods:

Authentication method Description
Auto login Login without user operation. The LINE Login screen or the confirmation screen is not displayed
Log in with email address Log in by entering an email address and password on the LINE Login screen
Log in with QR code Log in by scanning a QR code displayed on the LINE Login screen using the QR code reader on the LINE app for smartphones
Single Sign On (SSO) Login Log in by clicking the login button on the confirmation screen with the message "Log in with the following account"

To learn more about which screens are actually shown and the conditions under which they appear for each of the authentication methods, see User authentication.

# Identifying users

Once a user has logged in to your app through LINE Login and your app has retrieved an access token for the user, the app can get the profile information that the user has registered with LINE.

You can get the user's ID, display name, profile image URL, and status message.

To learn more, see Getting user profiles.

# LINE Login versions

The following versions of LINE Login have been released. Each version supports a different set of features.

LINE Login Description
LINE Login v2.1 This version can handle login requests based on the OAuth 2.0 authorization code flow (opens new window). It also supports the OpenID Connect (opens new window) protocol and allows you to get user information with ID tokens.
It was released on September 28, 2017. To learn more, see LINE Login v2.1 released.
LINE Login v2.0 This version can handle login requests based on the OAuth 2.0 authorization code flow (opens new window). It also allows you to get user information.
It was released on January 24, 2017. To learn more, see New versions of Web Login and the LINE SDK released.
LINE Login v1 This version and all of its endpoints were discontinued on June 30, 2018. It is not currently available for use. To learn more, see LINE Login v1 to be discontinued.