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Security

Unauthorized Logins

Important: protecting your account from being stolen toggle
There have been many cases in which unauthorized third parties have logged in to internet services using email addresses and passwords leaked from other services. No information registered to LINE, such as phone numbers, email addresses, and passwords, have been compromised.

If you use the same email address and password for LINE as another service, we strongly recommend changing your password.

Please try the following on the smartphone version of LINE:


Reported cases of unauthorized logins
The following types of messages are often sent by the third party when an account is stolen. If you receive messages asking you to do the following from a friend, their account may have been stolen:

• Help me buy prepaid cards
• Help me buy iTunes cards
• I’m in trouble and need you to transfer money to my bank account

As they may change the content of their messages at any time, you should also suspect if your friend’s account has been stolen in the following cases:

• The messages do not sound like the way your friend talks
• A friend whom you have not spoken to for a long time suddenly asks you for money
• The friend's language is unnatural

If your friend’s account was stolen
If you suspect that your friend’s account may have been stolen, please contact them outside of LINE (in person, by text, by phone, or on a social network) to let them know.

If your account was stolen
If you are suddenly unable to access your account even though you did not make any changes to it, or if your friend contacts you to let you know that your account has been stolen, please see the following article:


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Account stolen toggle
If your LINE account was stolen by someone logging in without your authorization, please see the following:

1. Try logging in again.
Open LINE on your smartphone and tap Log in. Enter the email address and password configured previously and see if you can log in. If you manage to log in, go to Settings > Account > Change your email to change your password immediately.

2. Send an account deletion request.
If you are unable to log in after trying step 1, someone may have already changed your password. Please go to the Problem Report Form, select Account > Stolen Accounts, and send us the details of the issue. We will delete your account to prevent its further misuse. We will also restore your items after looking into your account.

Note: Items that can be restored
- The right to use your LINE stickers and themes (including those received as gifts)
- Purchase history and Coin balance
- LINE STORE Credit balance

Apply to Restore items

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Account Security

Friends see duplicate accounts toggle
If you create a new LINE account on a new device without deleting the account on your previous device, you will end up having two accounts.

Your old account cannot be deleted if you no longer have access to your previous device. Please ask your friends to block your old account in this case.

Please see the following article for help with blocking friends.

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Can my phone number, LINE ID, or email be seen by other people? toggle
LINE will never disclose your registered phone number, ID or email address to any third parties. Such information will only be disclosed if you do so yourself.

Only your display name, profile image and 'What’s Up?' messages on LINE are available to be seen by other users.

We hope this helps!

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If only I know the other person's phone number, can the other person see my profile? toggle
If a person with your mobile phone number registered in their contacts list starts LINE, they will automatically be added to your friends list. If you do not wish to automatically add friends, please turn off Auto Add Friends on your smartphone.

If your phone number is not registered in their contacts list, you appear under their Friends Recommendations, where your LINE Display name, profile photo, Status Message, and Home background image will be displayed. However, they will not be able to see any other information.

If you want to be deleted from their Friend Recommendations list, you must delete your account from your smartphone.

Likewise, once your account has been added to their friends list, you will remain there unless you delete your own account.

For information on deleting your account, please see this article.

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Chat Security

Possibility of messages being viewed by third parties toggle
As messages sent in chats are covered by the law governing privacy of communications, no LINE employee or third party, besides the chat participants themselves, will be able to view them. LINE treats the chat history and other information of its users as important personal information, and handles them with the maximum level of security possible.

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Preventing messages from strangers toggle
To avoid messages from strangers, please refer to the measures below.

To reject users besides your friends from messaging you
1. Tap the settings icon > Privacy.
2. Turn ON Filter Messages.

If you receive messages from strangers on LINE, please block them by following the steps below.

1. Open the chat sent by the user and tap the V icon at the top right.
2. Tap Block.

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Blocking LINE GAME messages toggle
To block messages from LINE GAME apps, please follow the steps below.

1. Tap the settings icon > Notifications > Authorized Apps.
2. Tap the app you do not want to receive notifications for.
3. Turn OFF Receive Messages or Receive Notifications.

You will no longer receive messages from the app by turning OFF Receive Messages; however you will still receive gifts awarded to you from friends. 

By turning OFF Receive Notification, you will still receive LINE chat messages; however you will not receive notifications for them.

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What is Letter Sealing? toggle
Letter Sealing is a feature that provides End-to-end encryption (E2EE) for chat room messages. E2EE is a communication system designed so that messages saved on our servers are encrypted and cannot be read by anyone except the sender and receiver of the message.

You will be able to read your chat messages as usual, but with added security if both the sender and receiver have turned on Letter Sealing.

If you use the PC version of LINE (Windows and Mac OS) or the iPad version after turning on Letter Sealing for the first time, you will be required to verify your identity on the smartphone version of LINE with a 6 digit verification number.

Letter Sealing can only be used on LINE versions 5.3.0 or later. If you are using a version earlier than 5.3.0, please update the app from here.

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Friend Security

If only I know the other person's phone number, can the other person see my profile? toggle
If a person with your mobile phone number registered in their contacts list starts LINE, they will automatically be added to your friends list. If you do not wish to automatically add friends, please turn off Auto Add Friends on your smartphone.

If your phone number is not registered in their contacts list, you appear under their Friends Recommendations, where your LINE Display name, profile photo, Status Message, and Home background image will be displayed. However, they will not be able to see any other information.

If you want to be deleted from their Friend Recommendations list, you must delete your account from your smartphone.

Likewise, once your account has been added to their friends list, you will remain there unless you delete your own account.

For information on deleting your account, please see this article.

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I do not want to be automatically added as a friend to others who have my phone number. toggle
To prevent being automatically added to the friends lists of other LINE users who have your phone number, please go through the following steps on your smartphone:

iOS and Android users:
1. Go to More or tap the three dots.
2. Tap Settings > Friends.
3. Turn OFF Allow Others to Add.

Firefox Phone users:
1. Tap the settings icon on the main menu.
2. Tap Friends.
3. Switch OFF Allow Others to Add.

If you wish to remove a user whom you have already added as a friend, please see this article.

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Can other people view my Friends list? toggle
Please be assured that no other users can view your Friends list.

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Someone is impersonating my friend on LINE. toggle
If you select to send your contacts list data from your smartphone to LINE’s servers upon registering to LINE, the phone numbers in your contacts list will be used to search other friends who are LINE users. If we find those users, they will appear in your friends list under the names registered in your contacts list.

Therefore, if a user is no longer using the phone number that is saved in your contacts list, a third party may appear on your friends list under the name that is registered in your contacts list. 

Please check if you have multiple entries for the same friend or whether you have a friend's old phone number or email address still registered in your contacts list.

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Filtering messages from non-friends toggle
To filter messages from users who are not your friends, please follow the steps below.

1. Tap the settings icon > Privacy.
2. Turn ON Filter Messages.

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Blocking friend recommendations toggle
You can block messages from users on your Friend Recommendations list by following the steps below.

1. Tap the friends icon > add friends icon.
2. Tap the user you wish to block.
3. Tap Block.

It may take a while for the changes to take effect.

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Blocking friends toggle
The following happens when you block a friend.
- You will no longer receive chat messages or voice and video calls from them.
- They will be moved from your friends list to your Blocked Users list.

Blocking a user does not completely remove them from your friends or friend recommendations list. To do so, please see the following article.

To block a friend
1. Tap the friends icon.
2. Swipe to the left the friend you want to block.
3. Tap the Block button.

To unblock a friend
1. Tap the settings icon > Friends.
2. Tap Blocked Users.
3. Tap Edit to the friend you want to show again.
4. Tap Unblock.

It may take a while for the changes to take effect.

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Removing friends toggle
Removing a friend deletes them from your friends list, and unlike blocking, cannot be undone. Please be careful when removing a friend you cannot contact otherwise.

Before you remove a friend, you need to hide or block them. To see more details, please see the following articles.


To remove a friend
1. Tap the settings icon > Friends.
2. Tap Hidden Users or Blocked Users.
3. Tap Edit next to the friend you wish to remove.
4. Tap Remove.

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Timeline and Home Security

Hiding and sharing a post toggle
If you wish to hide a Home or Timeline post, please refer to either of the following steps:

Hiding a post for LINE versions 6.6 and later
1. From the relevant post, tap Friends (Public or Only Me) at the top of the screen.
2. From the Privacy settings screen, tap the arrow icon next to Friends.
3. Tap Restrict next to the friends you wish to hide posts from.
4. Tap Save at the top right of the screen.

If you select Only Me from the privacy settings, no one but you will be able to view the relevant post.

Hiding posts from settings
1. Go to Settings > Timeline > Share Settings.
2. Tap Restrict next to the friends you wish to hide posts from.
3. Tap Save at the top right of the screen.

If you add a friend to the restricted list under share settings, they will no longer be able to view your posts. However, if later on you wish to allow them to view your posts again, you can do so by following the steps below:

1. From the Share Settings screen, tap the Restricted tab.
2. Tap Unrestrict next to the friends you wish to allow to view your posts.
3. Tap Save at the top right of the screen.

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Share a post with certain friends toggle
When you make a Timeline or Home post, you can limit the audience by selecting a group or creating a share list.

Note: If you restricted a friend from viewing your Timeline posts, you will not be able to add them to a share list.

If you wish to add a restricted friend to a share list for a Timeline post, please remove them from the Restricted list of users from the Share Settings beforehand by referring to the following Help article:


To create a share list, please follow the steps below:

1. Tap Friends (Public, or Only Me) at the top of the relevant post.

The following steps will differ depending on whether a share list was created or not.

If a share list was not created
2. From Share List, tap Add.
3. From the Friends or Groups tab, select the friends you wish to add to the share list and tap OK.
4. In the New List field, enter a name of your choosing and tap Save.

If a share list has already been created
2. Select a previously created list under Share List.
3. Tap Done at the top right of the screen.

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Hiding Timeline posts from new friends toggle
By default, Timeline and Home posts are automatically made visible to newly added friends. To change this, please follow the steps below.

1. Tap the settings icon > Timeline.
2. Turn OFF the setting for Allow New Friends.

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Hiding Timeline posts from specific friends toggle
Your friends posts' will appear on your Timeline.

If you do not want to see posts from certain friends, please refer to the steps below to hide them.

1. Tap the V icon on post of the friend you wish to hide.
2. Tap Hide Posts from this user.

Please note the following:
- If you have set to hide posts from a friend, all of their posts will be removed and newer post will not appear on your Timeline.
- Friends will not be notified when you hide them.

To unhide a friend and their posts, tap Settings > Timeline > Timeline Hidden List, then tap Show.

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Visibility of Timeline posts to others toggle
Your Timeline posts are only visible to users who are mutual friends. If only one of you has added the other as a friend, they will not be able to see your posts. Please note if your privacy settings for a Timeline post is set to Public, your friends as well as other users who are not your friend will be able to view the post.

If you are mutual friends with someone but do not want them to see your Timeline posts, please configure your Privacy Settings. If you want to prevent your Timeline posts from being visible to friends you add in the future, please turn OFF  the setting forAllow New Friends.

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Hiding groups and friends from My Groups on Timeline toggle
If you tap My Groups in the menu found inside Timeline, you will see groups and friends that you have used the notes and albums features for in 1-on-1 chats or groups.

If you hide groups or friends from My Groups, you will not receive notifications for Likes or comments on posts.

To hide these groups or friends, please follow the steps below.

1. Tap the Timeline icon.
2. From the menu list on the left, tap My Groups.
3. Tap the three dots on the top left of the pop-up screen > Edit Group.
4. Tap the groups or friends you want to hide.
5. Tap OK.

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Friends' Timeline posts stopped showing up toggle
If your friend’s Timeline posts have stopped showing up, the following reasons may be possible.

- You blocked the friend.
- The friend blocked you.
- You added the friend to your Timeline Hidden List.
- The friend configured their privacy settings to hide their posts from you.

If you have signed up for a new account, please ask your friend to check their privacy settings.

If you have blocked the friend or added them to your Timeline Hidden List, you can see their Timeline posts again by unblocking or unhiding them.

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A post that was only set to share with specific friends on Timeline appears on my Home toggle
Posts you set to share with specific friends and yourself will also appear on your Home. However, the content of those posts will only appear on your device.

When you set the privacy settings for a post, it will not appear for friends whom you have set to Hidden in the Timeline privacy settings. Posts set to Only Me will not be visible to anyone but yourself.

Users who are not your friend on LINE, as well as users you have specified to hide a Timeline post from will only be able to see posts set to Public when they visit your Home. 

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