# FAQ

Q
I made a rich menu with Bot Designer but it isn't working.

In Chats mode, click on a rich menu from the Rich Menu pane located on the bottom right to activate it.

Q
I made a template message in Bot Designer but the link doesn't work.

Check if you have included "http://" or "https://" in the URL. The link must be in the same URL format as used on browsers.

Message actions will work normally when added to the chat in Chats mode.

The actual LINE chatbot only accepts URLs starting with "https://" to ensure security. LINE Bot Designer doesn't have this limitation to encourage the creation of any chatbot prototype.

Q
Can I change the company name on the bottom of the profile page?

The company name displayed on the bottom of the profile page is your Provider name. You can change your Provider name by following these steps:

  • For Certified providers (Certified providers have a certified provider badge before their company name)

    You need to submit an application to LINE, so contact your sales representative.

  • For non-Certified providers

    From the LINE Developers Console, select provider, click Settings, and from the Provider settings, and click the Edit button under Provider name.

    Provider name edit

*It will take some time before the change of provider name is reflected on your profile page.

Q
How many channels can I create?

See The number of channels that can be created in the LINE Developers Console documentation.

Q
Where can I find my Channel ID?

You can find your Channel ID on the LINE Official Account Manager (opens new window) or the LINE Developers Console.

  • LINE Official Account Manager (requires Admin role):

    Select account from accounts list and click Settings in the top-right corner of the page. Click Messaging API from the side menu, and you will see your Channel ID next to Channel Info.

    OAM settings

  • LINE Developers Console:

    From the LINE Developers Console, select provider, and then select channel. You can find your Channel ID under Basic settings.

    Console settings

Q
Where can I find my Provider ID?

You can find your Provider ID on the LINE Developers Console.

  • If you have Provider Admin role:

    From the LINE Developers Console, select provider and then click Settings. You can find your Provider ID under Provider settings.

    Provider ID Admin

  • If you don't have Provider Admin role:

    From the LINE Developers Console, select provider. From the page displayed, you will see your Provider ID in the segment after /provider/ in the URL.

    Provider ID URL

Q
How do I contact technical support for inquiring about LINE APIs?

There is no technical support desk for individual developers. See Documentation for information on the development process and specifications of the LINE APIs. You can also exchange information with other developers on the Developers Community.

If you are a corporate customer and need technical support for LINE APIs, contact our Technology Partners (opens new window) for technical support. Any inquiry regarding the LINE APIs should be through our Technology partners.

Q
How do I report an issue about the LINE Platform?

To report a problem encountered on the LINE Platform or make a request for improvement, contact us using the help center's Inquiry form (opens new window). Note that we may not be able to respond to all inquiries.

If you need technical support, see How do I contact technical support for inquiring about LINE APIs? in the FAQ.

Q
When trying social login with google account in the LIFF browser or LINE's in-app browser, an error with a status code 403 and an error code disallowed_useragent will be displayed.

In the LIFF browser and LINE's in-app browser, the user's social login with google account isn't allowed. This is because Google's OAuth 2.0 Policies (opens new window) disallow authorization requests from WebView to Google.

Therefore, when the user tries social login with google account in the LIFF browser or LINE's in-app browser, an error with a status code 403 and an error code disallowed_useragent (opens new window) will be displayed.

Q
Why can't I open a page and an error message appears in the LIFF browser or LINE's in-app browser?

In the LIFF browser and LINE's in-app browser, if there is a problem with the SSL/TLS certificate on a network path, an error may occur and you may not be able to open the page. The following are examples of the error message that appears when the page doesn't open:

  • This connection isn't private
  • Unable to process your request due to a temporary error. Please try again.
  • An unknown error occurred. Please try again later.
  • Unable to open page. Server not found.
  • This site is potentially unsafe. Please close this screen.

Note that even if there is no problem with the certificate of an accessed page, you may receive an error message if there is a certificate problem when loading external resources contained on the page. For example, if you specify a path on a server with a certificate problem in the src attribute of a <script> element as shown below, you may receive an error message.

<script charset="utf-8" src="{A path on a server with a certificate problem}"></script>
Q
How can I get a user's phone number?

You can use LINE Profile+ to get a user's phone number. For more information, see LINE Profile+ scopes in the Options for corporate customers documentation.

LINE Profile+ is only available to corporate users who have completed certain applications. If you wish you use LINE Profile+, contact your sales representative or contact our Sales partners (opens new window).

Q
Is it possible for the user IDs of users who have deleted their LINE accounts to be used again?

About the user ID issued by a certain provider, in the case that the corresponding LINE account is deleted, the same user ID won't be reused for other LINE accounts within the provider.

For more information on user IDs, see What are the user ID, group ID, and room ID values?

Q
What are the user ID, group ID, and room ID values?

The user ID used by the LINE Platform identifies a user and has the following characteristics:

  • The value is generated by the LINE Platform, not by a user. This is different from the LINE ID on LINE used to search for friends.

  • Different user IDs are generated based on the provider of the channel. As long as channels have the same provider, regardless of whether the channel is for LINE Login or Messaging API, the same user ID is used for the users of the channels.

  • The user ID value is a string that matches the regular expression, U[0-9a-f]{32}.

The group ID used for group chats and the room ID used for multi-person chats are values generated by the LINE Platform to identify group chats and multi-person chats.

The group ID is a string that matches the regular expression, C[0-9a-f]{32}, and the room ID is a string that matches the regular expression, R[0-9a-f]{32}.

Q
Once a user ID is issued, can it be changed at any time?

User IDs are issued by each channel provider. Once a user ID (userId) is issued for a specific provider, it won't change unless the user deletes their LINE account.

The user ID won't change even if the user transfers their LINE account to another device.

If a user deletes their LINE account and then re-creates a LINE account with the same phone number, the user ID will change.

For more information on user IDs, see What are the user ID, group ID, and room ID values?

Q
Where can I check the status of LINE API outage?

You can check the current status of a LINE API outage using these methods:

Q
Can I get permissions to use restricted API resources such as Graph and User Message APIs?

General LINE SDK users cannot use restricted API resources such as Graph and User Message APIs. Currently those resources are LINE internal use only.

Q
How do I download the LINE SDK?

You can download the LINE SDK from the LINE API SDKs page.

Q
How are the URL previews in chats and on LINE VOOM generated?

LINE uses Open Graph Protocol tags from websites to generate URL previews.

The three OGP tags used by LINE:

# Open Graph Protocol tag Example
1 og:title <meta property="og:title" content="LINE : Free Calls & Messages">
2 og:description <meta property="og:description" content="LINE is a new communication app">
3 og:image <meta property="og:image" content="http://static.naver.jp/line_lp/img/ogp.png">

Example of URL preview:

URL preview in chat

OGP configuration

Even if you don't configure OGP tags, any text or image within the URL will be automatically retrieved to generate a URL preview.

For example, for the Title, if there is no available information in og:title, the text within the title tag will be displayed. Likewise, for the Summary, if there is no available information in og:description, the text within either the description tag or the body will be displayed (If there is no retrievable information, nothing will be displayed in the preview).

LINE uses only the three OGP tags listed above. URL previews will not include information contained in any other OGP tags.

Tip

A cache-deletion tool (opens new window) for deleting the LINE server side cache of your URL preview is now available.

Q
Which browsers does LINE Developers support?

The supported browsers are Google Chrome, Safari, and Microsoft Edge.

Internet Explorer isn't supported.

Q
How does auto login work?

Auto login can be used in these situations. You don't need to perform any special configurations when implementing LINE Login into your web app to use Auto login.

  • iOS

    • Auto login can be used when accessing a web app where LINE Login v2.0 or v2.1 is implemented using LINE's in-app browser or the Safari browser.
  • Android

    • Auto login can be used when accessing a web app where LINE Login v2.0 or v2.1 is implemented using LINE's in-app browser or external browsers such as Chrome.

Auto login isn't supported for devices other than iOS and Android devices, devices where LINE isn't installed, and in browsers other than the Safari browser for iOS.

Also, we use iOS's Universal links (opens new window) and Android's App Links (opens new window) features to perform auto login on external browsers. Check the official documentation for each OS for information on concepts such as how the dialog is displayed when using these features, the OS requirements for using these features, and how to disable these features.

For more information, see Auto login in the LINE Login documentation.

About automatic login from the Yahoo! JAPAN app

Auto login is enabled when accessing a web app that incorporates LINE Login with PKCE implementation from the Yahoo! Japan app. For more information on PKCE support for LINE Login, see PKCE support for LINE Login in the LINE Login documentation.

Q
Why do I get an NLChannelGatewayErrorDomain error when I try to use LINE Login in my application?

NLChannelGatewayErrorDomain errors (for example, NLChannelGatewayErrorDomain Error 102) can occur if there are incorrect or missing settings in the LINE Developers Console.

If your iOS application is getting this error, confirm the following items:

  • The iOS bundle ID is registered on the LINE Login tab of your channel settings on the LINE Developers Console
  • The iOS universal link is registered on the LINE Login tab of your channel settings on the LINE Developers Console
  • The LINE account that you are using to log in with is registered in the Roles section of the LINE Developers Console
Q
Can I block a user who has added my LINE Official Account as a friend?

You can't block a user who has added your LINE Official Account as a friend.

Q
Can I determine if a user is a friend of my LINE Official Account?

You can determine with a follow event and an unfollow event of webhook events. There is no endpoint to determine if a user is a friend of your LINE Official Account.

Q
Can I get the list of group chats and multi-person chats that my LINE Official Account is participating in?

Currently, you can't get the list of group chats and multi-person chats that your LINE Official Account is participating in.

Q
Can I internationalize or multilingualize messages and rich menus?

Currently, there is no function to switch the language of messages or rich menus based on the user's language.

Use the Get profile endpoint to get the user's language, and then send messages or set up a per-user rich menu based on the user's language.

Q
Can I make the background of rich menus transparent?

No, you can't make the background of rich menus transparent.

Q
Can I see the paths taken by users to add my LINE Official Account as a friend on a per-user basis?

You can't use the Messaging API to see how a specific user added your LINE Official Account as a friend.

You can see the friend adding paths statistics, without identifying individual users, in the LINE Official Account Manager (opens new window). For more information, see Insight analytics - Friends (opens new window) (only available in Japanese) in LINE for Business.

Q
If a user shares my LINE Official Account with a friend, can I see the result of the friend referral (whether my LINE Official Account was added as a friend or not, and how many people added the LINE Official Account)?

No, you can't.

When the person to whom the LINE Official Account was referred adds them as a friend or unblocks them, a webhook follow event is sent from the LINE Platform to the bot server. However, you can't use the Messaging API to confirm how the user added the LINE Official Account as a friend (i.e., whether the user added the LINE Official Account as a friend through someone's referral).

It is also not possible to confirm the number of people who have friended the LINE Official Account as a result of friend referrals.

Q
Can I see who has read a message I've sent from my LINE Official Account?

You can't use the Messaging API to verify that a message you sent was read. You can get statistics about your sent messages on the following endpoints:

Q
Can I send PDF files with the Messaging API?

You can't send PDF files with the Messaging API.

Q
Can I send purchased or company-owned stickers using the Messaging API?

Using the Messaging API, you can send only the stickers listed in the Stickers.

You can send other stickers using the following methods:

  • You can send stickers that you own with your LINE account. To send your own stickers, go to "Chats" in the LINE Official Account Manager (opens new window) or the LINE Official Account Manager App. For more information, see Chats (opens new window) (only available in Japanese) in LINE for Business.
  • Only corporate users who have submitted the required applications can send stickers owned by the company such as sponsored stickers or creators' stickers. To send these stickers from your LINE Official Account, contact your sales representative or contact our Sales partners (opens new window).
Q
If my LINE Official Account is alreadly linked to a Messaging API channel, can I un-link my LINE Official Account from the Messaging API channel?

Once you've linked your LINE Official Account to a Messaging API channel, you can't un-link your LINE Official Account from the Messaging API channel.

If you want to continue using your LINE Official Account linked to the Messaging API channel, but want to stop using the Messaging API, see Stop using the Messaging API in the Messaging API documentation.

Q
Do messages sent using the Messaging API reach users immediately?

Messages sent using the Messaging API may take some time to reach the user.

Messaging requests to each endpoint of the Messaging API are processed asynchronously. For this reason, if a LINE Official Account has many friends, or if there are a large number of requests from other LINE Official Accounts at the same time, it may take some time for the message sending process to be completed.

Q
Does it cost money to use the Messaging API?

For more information about Messaging API pricing, see Messaging API pricing.

Q
How can I get the name and profile image of a group chat?

With the Get group chat summary API, you can get the name, and URL of the icon of the group chat that the LINE Official Account is participating in.

Q
Can I delete the bot for my LINE Official Account?

To delete the bot, you need to delete your LINE Official Account.

Q
How can I find out the file format of the retrieved content?

When you get content, the file format of the binary data returned in the response is indicated in the Content-Type (opens new window) header of the response.

By checking the value of the Content-Type header, you can find out the file format of the content. Examples of file format indicated by the Content-Type header are as follows:

Content sent by users Content-Type header example
Image image/jpeg
Video video/mp4
Audio audio/x-m4a
File text/plain
Q
How can I use the Messaging API with my existing LINE Official Account?

To use the Messaging API with your existing LINE Official Account, enable the Messaging API on the LINE Official Account Manager (opens new window).

For more information, see Use the Messaging API with your existing LINE Official Account in the Messaging API documentation.

Q
If I send a message to a user who doesn't receive the message, is it still counted as one message?

If you specify a user who doesn't actually receive the message, such as a user ID that blocked the LINE Official Account or a user ID that doesn't exist, the message won't be counted even if you call the API for sending the message.

Q
Do I get an error when I send a message with a user ID that blocks the LINE Official Account?

If you send a message specifying a user who has blocked the LINE Official Account or a user who deleted their account, no error will occur and status code 200 will be returned as a response.

In this case, no message will be sent to the user.

Q
To restrict access from unauthorized parties when calling the Webhook URL, can you publish the IP address of the LINE Platform?

We don't disclose IP addresses.

We prevent unauthorized requests through SSL communication and Verifying signatures included in the webhook.

Q
If I send a push message with multiple message objects (for example, 4) in a single request to a group chat or multi-person chat with multiple people (for example, 5 people), how many messages will be counted?

The number of messages is counted by the number of people to whom the message was sent. In this example, if there are five people in the group chat or multi-person chat where you sent the message, the number of messages counted is five. The number of message objects specified in a single request doesn't affect the number of messages sent.

For message count when you send a message to a user who doesn't receive the message, see If I send a message to a user who doesn't receive the message, is it still counted as one message?.

For more information on pricing, see Messaging API pricing.

Q
If I set multiple message objects in the request body when sending a message, will the messages be delivered in the order they are set from the top?

Yes.

If multiple message objects are set in the request body when sending a message, the messages will be delivered in the order they are set from the top.

Q
How many full-width characters, emojis, line breaks, and so on, are counted in the text character count?

Characters in a text are counted in UTF-16 code units (16-bit). Characters expressed in multiple code units, such as some kanji characters and Unicode emojis, are counted as multiple characters instead of one character.

However, some properties are counted in grapheme cluster (opens new window) units rather than UTF-16 code units. For more information, see Character counting in a text in the Messaging API documentation.

Also, unlike Unicode emojis, LINE emojis provided by LINE are internally converted to the alternative text (e.g., (love)), so they're counted by the number of characters in the alternative text.

Examples of counting the number of characters in UTF-16 code units are as follows:

Character UTF-16 encoded value Number of code units Number of characters
a 0061 1 1 character
3042 1 1 character
\n 000A 1 1 character
908A 1 1 character
𠀋 D840 DC0B 2 2 characters
👋 D83D DC4B 2 2 characters
👋🏻 D83D DC4B D83C DFFB 4 4 characters
Q
Is the message ID in the message webhook event object unique per message type or per channel?

Message IDs are assigned a value that is unique throughout the Messaging API environment.

It doesn't mean that it's unique for each channel or message type, such as an image.

Q
If I send multiple messages to the same user with the Messaging API, in what order will the messages be displayed?

The order in which messages are displayed depends on how the messages are sent.

If endpoints used for sending messages are executed multiple times, the order in which the endpoints are executed and the order in which the messages will be displayed won't be necessarily the same.

If an endpoint for sending messages is executed once and multiple messages are specified in the request body, the messages will be displayed in the order specified in the request body.

Q
Where can I find my user ID?

You can find your user ID in the Your user ID of the Basic settings tab of the channel in the LINE Developers Console. For more information, see Developer gets their own user ID in the Messaging API documentation.

Q
Why can't I receive webhook events?

Your account may not have been set up to allow webhooks. To allow webhooks, enable Use webhook on the Messaging API tab of your channel settings on the LINE Developers Console.

Q
Why can't I save on Keep or forward videos that are sent from a LINE Official Account?

End users can't save on Keep or forward videos sent from a LINE Official Account.

Q
Why does my LINE Official Account automatically leave a group chat or multi-person chat after I've invited it?

It's possible that Allow bot to join group chats setting is disabled on your LINE Official Account, or that another LINE Official Account has already joined the group chat or multi-person chat you invited.

For more information, see Add LINE Official Account in group & multi-person chats in the Messaging API documentation.

Q
Why does my LINE Official Account automatically send replies?

Depending response settings on the LINE Official Account Manager, the LINE Official Account will automatically send replies.

Click Edit in Auto-reply messages on the Messaging API tab of your channel settings on the LINE Developers Console to access LINE Official Account Manager and check Response setting.

LINE Official Account will automatically send replies in these cases:

  • If Greeting message is set to Enabled, it will automatically send replies when user adds your LINE Official Account as a friend.
  • If Auto-response is set to Enabled, it will automatically send replies according to the preset conditions.
  • If Chat is set to On, depending on the Chat response method setting, it may automatically send replies.
Q
Why won't my iPad display rich menus?

The iPad that created the LINE account or the iPad that took over the LINE account can display rich menus.

Other iPads can't display rich menus.

You can check the LINE settings screen to see if your iPad can display rich menus.

  • If Delete Account appears in Settings > Accounts, the iPad can display rich menus.

  • If Logout appears in Settings > Accounts, the iPad can't display rich menus.

Q
Can I add buttons to both PC and mobile web pages?

Yes, adding buttons is easy for both PC and mobile web pages.

After selecting a button type and language, copy the code and paste it where you want the button to be added on the website. For detailed steps, see the Installation guide.

Q
Can I resize the buttons?

For the LINE Share button only, you can resize the button using a custom icon. For more information about how to install a button using a custom icon, see Using custom icons. Otherwise, Like buttons and Add friend buttons don't support resizing.

Q
Can I see the total number of button clicks/taps I get?

You can see the total number of shares, added friends, and likes.

LINE Share button: If you turn on the share counter when you add the LINE Share button, the number of shares will appear along with the button.

Add friend button: You can set the Add friend button with a counter that shows the number of added friends.

Like button: The number of likes will appear regardless of the button type you use.

We currently don't offer statistics based on dates, age, or gender.

Q
Are there times when the Add friend button can't be used?

The Add friend button can't be used to add LINE official accounts that have been blocked by/hidden from the LINE app, or if the LINE official account has already reached the maximum number of friends.

Q
Can anyone set the Add friend button?

To set the Add friend button, you need a LINE official account ID. For details about creating a LINE official account, see the LINE Official Account Help page (opens new window).

Q
When installing the Add friend button, can I use my personal LINE ID?

You can't install the Add friend button using your personal LINE ID. A LINE Official Account is required to install the Add friend button.

Q
Can I delete LINE official accounts after I add them as friends?

Yes, you can delete LINE official accounts from your friend list in the LINE app.

Q
The Like button and Add friend button don't work on Safari, even if I log in.

There are currently issues with the "Like" and "Add friend" buttons not working properly due to the Safari browser's policy changes. This issue is occurring with similar services as well, and not just with LINE Social Plugins.

We are closely keeping track of this issue so that it can be resolved as soon as possible.

However, note that the following configuration will allow you to use the "Add Friend" button in the Safari browser.

[PC Safari setting]

  1. Safari > Preferences > Privacy > Website tracking: Undo "Prevent cross-site tracking"
Q
Clicking the Like button on the mobile version doesn't work.

Depending on the browser policy, the Social Plugins' "Like" button may not work on the mobile version of the browser. This is a problem not only for LINE Social Plugins, but also for all similar services, and it can be solved by changing the settings of the mobile app.

[Chrome settings]

  1. Mobile device settings > Select Chrome app > Set Chrome as default browser app
  2. For iOS, go to settings > Select Chrome app > Allow Cross-site tracking
  3. Launch the Chrome app > Select the kebab menu (three-dot icon) next to the omnibox (address bar) > select settings > select content settings (iOS) or site settings (Android) > Turn off Pop-up blocker

[Safari settings]

  1. Mobile device settings > Select Safari app > Set Safari as default browser
  2. For iOS, go to Settings > Select Safari App > Allow Cross-site Tracking
  3. Mobile device settings > Select Safari app > Turn off Pop-up blocker
Q
Can I add buttons to native iOS and Android apps?

If you want to add the LINE Share button to native apps, refer to the Using LINE features with the LINE URL scheme page, not the LINE Social Plugins page.

Q
Can I see my own share history?

There is no feature for viewing the history of the websites you've shared.

Q
Can I share just a certain selection of text with the LINE Share button?

Yes, the LINE Share browser extension makes sharing selected text easy. After installing the extension on the Chrome or Whale browser, you can select text and quickly share it with the LINE Share feature.

Download the LINE Share extension for Chrome here (opens new window).

Download the LINE Share extension for Whale here (opens new window).

Q
Can I share photos and videos with the LINE Share button?

The LINE Share button lets you share URLs and text. You can share the URL of a website with photos or videos, but you can't share photos or videos directly.

Q
Can I use my own icon for the LINE Share button?

Yes, you can use a custom icon that you made for the LINE Share button. For information on how to set your own button icon, see the Using custom icons.

When designing your button icon, make sure to refer to the design guide.

Q
I saved content to Keep when sharing it from a PC, but I don't see it in Keep Memo.

Content appears in the Keep Memo chat room only when you share it from a mobile device and select Keep Memo.

If you share content from a PC and select Keep, that content is saved in Keep and not in the Keep Memo chat room.

• To check saved content on LINE for PC: Click the Keep icon at the top left of LINE for PC.

• To check saved content on your smartphone: From the Home tab on LINE, tap your profile at the top of the screen > Keep.

Q
When clicking the LINE Share button in the Safari browser, the login process repeats infinitely.

When accessed in a private browsing window in Safari, an infinite auto login loop like this may occur. This is because private browsing is designed to protect a user's privacy, and LINE login does not support auto login in a private browsing window. Therefore, please use the LINE Share button in a non-private Safari window.

Q
When using the Share button, is it possible to share text with the URL?

When installing the Share button using a custom icon, you can have the URL and text shared together. For more information about how to install a button using a custom icon, see Using custom icons. When using the official LINE icon, text sharing is not supported.

Q
Are there any sites where you can't add the LINE Share button?

Use of the LINE Share button is prohibited on websites that lead to illegal products/services, adult/excessively violent content, or spam sites. Refer to the guidelines for details.

Q
I set a custom icon Share button using the share counter API documentation, but an error occurs and the API doesn't work.

A "blocked by CORS policy" error message may appear and the share counter API may not work in some cases. If you see this error, it means the API is restricted due to the same-origin policy, which is meant to prevent other origin resources on the internet from being accessed.

When using a custom icon, a server-side request is required for the share counter API to work.

If you have any questions about this or any other error, contact us (opens new window).

Q
When using the LINE Share button, the URL preview sometimes does not appear.

Depending on the URL you try to share, the preview may not be displayed. If the preview does not appear, you can still share the URL.

Q
Why does text that I shared with the LINE Share button appear garbled?

It's possible the character encoding is incorrect. Check to make sure that you shared percent-encoded text with UTF-8 character encoding.