Card

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

string

required

"card"

string

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

string

Markdown, up to 3,000 characters.

string

Plain text, up to 150 characters.

string

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

string

An uploaded image instead of a URL.

array

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

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"
}

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Sending messages

Block Kit

Receiving events

No-code platforms