Help center

Chat safety/security

Do I need to worry about other people being able to see my chats?

We respect your privacy above all else, and your sent/received messages and other information are treated with the highest level of security. LINE has established strict internal rules to ensure that your messages are protected.

Nothing you send or receive can be viewed by LINE or any third parties not participating in a chat.

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About Letter Sealing key fingerprints

Key fingerprints are unique encryption keys that Letter Sealing gives to each user so they can send messages to one another safely and securely.

Note: The actual keys are kept secret and will not appear in LINE chats.

If your key fingerprint matches your friend's, it means your chat is securely encrypted. To check whether your key fingerprints match, follow the steps below.

Note: Key fingerprint confirmation is optional.

1. Tap the menu icon at the top of a chat screen.

2. Tap This chat is protected with Letter Sealing at the bottom of the screen.

3. Compare the key fingerprints on your device and your friend's device.

Note: To compare key fingerprints with your friend, we recommend meeting face-to-face or using a form of communication you trust.

If "This chat is protected with Letter Sealing" doesn't appear, it means Letter Sealing is turned OFF. To turn Letter Sealing ON, follow the steps in this Help article.

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The Letter Sealing identify verification screen isn't appearing

If you're trying to verify your identity so you can use Letter Sealing on LINE for PC, but the verification code entry screen isn't appearing in LINE on your smartphone, restart the smartphone app and try verifying your identity again by referring to this Help article.

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The lock icon no longer appears at the top of a chat

To check whether a chat is protected with Letter Sealing, tap the menu icon at the top of the chat screen. If Letter Sealing is turned ON, you'll see "This chat is protected with Letter Sealing."

Note: You'll also see a lock icon at the beginning of the sentence.

If "This chat is protected with Letter Sealing" doesn't appear, see the following Help article.

Turning on Letter Sealing

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About Letter Sealing

Letter Sealing is a feature that provides end-to-end encryption (E2EE) for chat 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.

Once the sender and receiver have both turned on Letter Sealing, they will be able to start sending messages with added security.

The following information will be encrypted:

• Text messages (not including messages sent through other services like YouTube)

• Location information

• 1-on-1 voice/video calls

Note: We plan to expand Letter Sealing’s functionality in the future.

If you use LINE for PC with Letter Sealing enabled on the smartphone version of LINE, you will be required to verify your identity the first time you send a message.

For information about verifying your identity to use Letter Sealing on LINE for PC, see this Help article.

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Turning on Letter Sealing

Letter Sealing is now turned on by default when you download LINE. As part of our efforts to strengthen the app's security, we've made it so this setting can no longer be turned off.

If you've been using LINE since before these specification changes were made and have Letter Sealing turned off, you can protect your messages by turning Letter Sealing on manually from the smartphone version of LINE.

To turn Letter Sealing on:

1. Tap the Home tab > Settings > Privacy.

2. Turn ON Letter Sealing.

Tap here to go to the Settings menu from your smartphone.

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Preventing messages from strangers

To stop strangers from messaging you:

1. From the Home tab, tap Settings > Privacy.

2. Turn Filter messages ON.

Note: Tap here to open the Privacy settings from your smartphone.

With the Filter messages setting turned on, you will no longer receive messages from strangers, but you also will not receive messages from any acquaintances that are in your Friend recommendations.

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Blocking LINE Game messages

To block messages from LINE Game apps:
1. Go to the Home tab > Settings > Notifications > Authorized apps.
2. Tap the game you want to block messages from.
3. Turn off Messages and/or Notifications.
Note:
- If you turn off Messages, you will not receive messages but will continue to receive any gifts your friends send you.
- If you turn off Notifications, you will still receive LINE messages but will not be notified when they arrive.

Tap here to open the Authorized apps screen from your smartphone.

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Help center

Search Help articles

Chat safety/security

Do I need to worry about other people being able to see my chats?

About Letter Sealing key fingerprints

The Letter Sealing identify verification screen isn't appearing

The lock icon no longer appears at the top of a chat

About Letter Sealing

Turning on Letter Sealing

Preventing messages from strangers

Blocking LINE Game messages