Image Attachments

The Image type is defined in ActivityStreams Vocabulary.

In the following, we test how various configurations of it are rendered.

A ❌ in the support table means that the entire message has failed to parse. A "-" means that the message was parsed, but no attachment was generated. The text, e.g. image or unknown is the the media type the Fediverse application determined for the attachment.

We furthermore wish to point out that having several links in the url property is useful to both offer the attachment in different formats and say dimensions, e.g. one high resolution and one low resolution one.

Examples

Example 1

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/BbZ75ghjuJM",
  "published": "2025-06-03T09:14:41Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/p6zkheWuk08",
    "published": "2025-06-03T09:14:41Z",
    "content": "Format png",
    "attachment": {
      "type": "Document",
      "url": "http://pasture-one-actor/images/001.png"
    }
  }
}

Example 2

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/PDsqRM8glRY",
  "published": "2025-06-03T09:14:51Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/bgHsxPuhrr8",
    "published": "2025-06-03T09:14:51Z",
    "content": "Format png",
    "attachment": {
      "type": "Document",
      "url": "http://pasture-one-actor/images/001b.png",
      "mediaType": "image/png"
    }
  }
}

Example 3

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/RGGciTp-57Q",
  "published": "2025-06-03T09:15:02Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/SXG45lg5IkQ",
    "published": "2025-06-03T09:15:02Z",
    "content": "Format jpg",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/002.jpg"
    }
  }
}

Example 4

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/P0bRJzkGQTo",
  "published": "2025-06-03T09:15:13Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/amyJ1vfd9K4",
    "published": "2025-06-03T09:15:13Z",
    "content": "Format jpg",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/002b.jpg",
      "mediaType": "image/jpeg"
    }
  }
}

Example 5

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/wWUBMgereSg",
  "published": "2025-06-03T09:15:24Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/-iZCUjfpyIQ",
    "published": "2025-06-03T09:15:24Z",
    "content": "Format svg",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/assets/FediverseLogo.svg"
    }
  }
}

Example 6

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/hiAuHJmy7bo",
  "published": "2025-06-03T09:15:34Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/gDeZDQCWs6I",
    "published": "2025-06-03T09:15:34Z",
    "content": "Format eps",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/003.eps"
    }
  }
}

Example 7

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/IiYLgDC1CbM",
  "published": "2025-06-03T09:15:45Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/W8Qk-KfnOyM",
    "published": "2025-06-03T09:15:45Z",
    "content": "Format gif",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/003b.gif"
    }
  }
}

Example 8

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/_hEYjZ4M6kQ",
  "published": "2025-06-03T09:15:56Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/f3AoJf7AlCc",
    "published": "2025-06-03T09:15:56Z",
    "content": "Format tiff",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/003c.tiff"
    }
  }
}

Example 9

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/FiYRkIG11S4",
  "published": "2025-06-03T09:16:07Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/bv_Sqr72K8U",
    "published": "2025-06-03T09:16:07Z",
    "content": "Format webp",
    "attachment": {
      "type": "Image",
      "url": "http://pasture-one-actor/images/003d.webp"
    }
  }
}

Example 10

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/dBbHT4ufiYw",
  "published": "2025-06-03T09:16:17Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/aOE9u_PuuKY",
    "published": "2025-06-03T09:16:17Z",
    "content": "url does not exit",
    "attachment": {
      "type": "Document",
      "url": "http://pasture-one-actor/assets/does_not_exist.png"
    }
  }
}

Example 11

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/0buWjLo9YLU",
  "published": "2025-06-03T09:16:28Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/E5SDm8fv2KY",
    "published": "2025-06-03T09:16:28Z",
    "content": "Wrong height / width",
    "attachment": {
      "type": "Document",
      "width": 13,
      "height": 17,
      "url": "http://pasture-one-actor/images/004.png"
    }
  }
}

Example 12

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/0rlOnV42wSM",
  "published": "2025-06-03T09:16:39Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/DoHFN9VlTCI",
    "published": "2025-06-03T09:16:39Z",
    "content": "No type",
    "attachment": {
      "url": "http://pasture-one-actor/images/005.png"
    }
  }
}

Example 13

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/mk7yoKzwANA",
  "published": "2025-06-03T09:16:50Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/0ECqwLQV1MI",
    "published": "2025-06-03T09:16:50Z",
    "content": "url is Link object",
    "attachment": {
      "type": "Image",
      "url": {
        "type": "Link",
        "href": "http://pasture-one-actor/images/006.png"
      }
    }
  }
}

Example 14

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/cOFhP42ZpP4",
  "published": "2025-06-03T09:17:00Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/MPfmqOF1K2E",
    "published": "2025-06-03T09:17:00Z",
    "content": "url is Link object with media type",
    "attachment": {
      "type": "Image",
      "url": {
        "type": "Link",
        "href": "http://pasture-one-actor/images/006b.png",
        "mediaType": "image/png"
      }
    }
  }
}

Example 15

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/UrRBxLXiIXA",
  "published": "2025-06-03T09:17:11Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/Z54m8q_pMTE",
    "published": "2025-06-03T09:17:11Z",
    "content": "url is Link object in an array",
    "attachment": {
      "type": "Image",
      "url": [
        {
          "type": "Link",
          "href": "http://pasture-one-actor/images/006c.png"
        }
      ]
    }
  }
}

Example 16

activity

{
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    {
      "Hashtag": "as:Hashtag",
      "sensitive": "as:sensitive"
    }
  ],
  "type": "Create",
  "actor": "http://pasture-one-actor/actor",
  "to": [
    "http://misskey/users/a8jupxivzylk0003",
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "id": "http://pasture-one-actor/actor/m1-KlI0TNqQ",
  "published": "2025-06-03T09:17:22Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a8jupxivzylk0003"
    ],
    "id": "http://pasture-one-actor/actor/9kB-YlVbeMs",
    "published": "2025-06-03T09:17:22Z",
    "content": "url is array of two Link objects",
    "attachment": {
      "type": "Image",
      "url": [
        {
          "type": "Link",
          "href": "http://pasture-one-actor/images/007.png",
          "mediaType": "image/png"
        },
        {
          "type": "Link",
          "href": "http://pasture-one-actor/images/008.jpg",
          "mediaType": "image/jpeg"
        }
      ]
    }
  }
}