Card

A picture, title, text, and buttons in one bordered box. Up to 5 cards per message.

type

string

required

"card"

title

string

Plain text, up to 150 characters. You need at least one of title or text.

text

string

Markdown, up to 3,000 characters.

subtitle

string

Plain text, up to 150 characters.

image_url

string

An https:// URL, drawn on top at 16:9.

image_file_id

string

An uploaded image instead of a URL.

buttons

array

Up to 3 buttons. Same rules and click behaviour as button_group.

footer

string

Plain text, up to 150 characters, in a quiet style.

{
  "type": "card",
  "title": "Sydney Opera House Tour",
  "subtitle": "Daily, 9:00 to 17:00",
  "image_url": "https://example.com/opera.jpg",
  "text": "Guided 1-hour tour. **AUD 43** per adult.",
  "buttons": [
    { "action_id": "book_tour", "label": "Book now", "value": "tour_syd_01", "style": "primary" }
  ],
  "footer": "Free cancellation up to 24h before"
}

Get started

Sending messages

Block Kit

Receiving events

No-code platforms