Image element

Fields

Field	Type	Description	Required?
type	String	The type of element. In this case type is always image.	Required
alt_text	String	A plain-text summary of the image. This should not contain any markup.	Required
image_url	String	The URL for a publicly hosted image. You must provide either an image_url or slack_file. Maximum length for this field is 3000 characters.	Optional
slack_file	Object	A Slack image file object that defines the source of the image.	Optional

Usage info

Use the image block if you want a block with only an image in it.

Examples

The image element must be used inside of the section block or the context block.

{
    "blocks": [
        {
            "type": "section",
            "block_id": "section567",
            "text": {
                "type": "mrkdwn",
                "text": "This is a section block with an accessory image."
            },
            "accessory": {
                "type": "image",
                "image_url": "https://pbs.twimg.com/profile_images/625633822235693056/lNGUneLX_400x400.jpg",
                "alt_text": "cute cat"
            }
        }
    ]
}

An image block using slack_file with a url:

{
    "blocks": [
        {
            "type": "section",
            "block_id": "section567",
            "text": {
                "type": "mrkdwn",
                "text": "This is a section block with an accessory image."
            },
            "accessory": {
                "type": "image",
                "slack_file": {
                    "url": "https://files.slack.com/files-pri/T0123456-F0123456/xyz.png"
                },
                "alt_text": "Slack file object."
            }
        }
    ]
}

An image block using slack_file with a id:

{
    "blocks": [
        {
            "type": "section",
            "block_id": "section567",
            "text": {
                "type": "mrkdwn",
                "text": "This is a section block with an accessory image."
            },
            "accessory": {
                "type": "image",
                "slack_file": {
                    "id": "F01234567"
                },
                "alt_text": "Slack file object."
            }
        }
    ]
}