Message types

Each LINE service offers different message types. Different rules may apply to each message type.

LINE Official Notifications (LON)

Message templates

Use message templates to ensure that communication follows LINE guidelines.

Message templates include following sections:

Header
Icon (optional)
Body
Buttons (optional)
Footer

Header and Footer

Header and footer are required, fixed, and predefined by LINE. No changes can be applied.

Icon

Icon is optional and must be always aligned center at the very top of the body. The message can contain only one icon exclusively from LINE icon collection. Whenever icon is used, the title in the body must also be placed at the central position. Use of images, audio, and video is not allowed.

Body

The body section is mandatory and must follow these guidelines.

There are four different structures at the disposal for the business to use in body (Basic, Emphasis, List, or Mix)
The body can contain only predefined content categories.
The rule of thumb is that the "Title" category must always be on top, and the "button" must be on the bottom. Title is always required and fixed upon template approval and cannot be altered. The title should reflect the type of notice per use case (i.e. Notice of delivery schedule, Notification of order completion, Notice of product shipment, Registration complete)
Ordering of other content categories is flexible.
When emphasis is used, separator is required.
LINE may impose character limits for the following categories "Greeting message", "Explanation" and "Apology".
Any amount/price needs to be set either in local currency or in USD.

Buttons

Buttons are optional. They should follow these guidelines.

They should be placed at the bottom of the notification.
Once they are registered as part of the template and approved, they are fixed and the registered URL cannot be changed. The overall rule is that the message must be informational and therefore the button should lead to a page that has additional information.
The only action behind a button can be to open a specified URL in LINE's in-app browser
- One exception is if an OA (sender) has a chat bot solution connected to it, the button can be used to send a webhook to trigger the cat bot or CRM discussion with the OA operator.
Client can register only one button, with exception of two button for the following use cases: Delivery, Expiration notice, Order confirmation, Departure notice.
For use case Contact center, buttons are not allowed.

Design structures

There are four different structures to use in body:

Basic
Emphasis
List
Mix

Basic

Body with title and explanation
Body with title, explanation, and button
Body with title, explanation, and two buttons

Emphasis

Body with title, emphasis, and explanation
Body with title, emphasis, explanation, and button
Body with title, emphasis, explanation, and two buttons

List

Body with title, list, and explanation
Body with title, list, explanation, and button
Body with title, list, explanation, and two buttons

Mix

Body with title, emphasis, list, and explanation
Body with title, emphasis, list, explanation, and button
Body with title, emphasis, list, explanation, and two buttons

LINE Official Account (Two-way)

Outbound messages

Text

Text messages are limited to 5,000 characters, including spaces.

Image

To send an image, upload it to an internal server first.

Media type	Format	Size
Image	.jpeg, .png	Image size: No limits File size: 10 MB (maximum)
Preview Image	.jpeg, .png	Image size: No limits File size: 1 MB (maximum)
Image URL		Character limit: 2,000 (maximum)

Location

Location messages are interactive maps.

Location messages have the following information:

Longitude- Coordinates between -180 and 180
Latitude- Coordinates between -90 and 90
Location Title - Name of the location. Maximum character limit: 100
Address- Address of the location. Maximum character limit: 100

Rich card

Note

Rich cards are available in Moments, Answers, and Conversations API.

Rich cards have the following components:

Image - To send an image, upload it to an internal server first.
Title - Text. Maximum character limit: 40
Text
- Text without image or title. Maximum character limit: 160
- Text with image and title. Maximum character limit: 60
Action button - Maximum of 4 action buttons. Supported actions are open URL and reply message.

Media type	Format	Size
Image	.jpeg, .png	Width: 1024 px (maximum) File size: 10 MB (maximum)
Image URL		Character limit: 2,000 (maximum)

Carousel

Carousel messages enable you to send multiple rich cards in one message.

If you want to send information about multiple related items, you can use Carousel messages instead of sending each item in a separate rich card. Customers can use horizontal scroll to view the rich cards within the carousel. Customers can compare the items in the cards and take actions for individual rich cards.

Carousel messages have the following components:

Image - To send an image, upload it to an internal server first.
Title - Text. Maximum character limit: 40
Text
- Text without image or title. Maximum character limit: 120
- Text with image and title. Maximum character limit: 60
Action button - Maximum of 3 action buttons. Supported actions are open URL, reply message, and postback.

Media type	Format	Size
Image	.jpeg, .png	Width: 1024 px (maximum) File size: 10 MB (maximum)
Image URL		Character limit: 2,000 (maximum)

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