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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/_7oTIeq_RVs",
  "published": "2025-06-16T09:28:39Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/wwOV2Zr3X-w",
    "published": "2025-06-16T09:28:39Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/6ySSfpueIAs",
  "published": "2025-06-16T09:28:50Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/ZzRh8PggkXQ",
    "published": "2025-06-16T09:28:50Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/N4vIP0EEhCs",
  "published": "2025-06-16T09:29:01Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/cULKmGOfVYs",
    "published": "2025-06-16T09:29:01Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/NHutwL7V_Ts",
  "published": "2025-06-16T09:29:11Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/KtM6GvnbV54",
    "published": "2025-06-16T09:29:11Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/nRAb7MuiIGg",
  "published": "2025-06-16T09:29:22Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/SvXueZFOJEo",
    "published": "2025-06-16T09:29:22Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/FCKxtNhGihc",
  "published": "2025-06-16T09:29:33Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/ofFKDNTxR6s",
    "published": "2025-06-16T09:29:33Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/mV_NVZ44tmk",
  "published": "2025-06-16T09:29:44Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/Nv_sro6dtJY",
    "published": "2025-06-16T09:29:44Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/CNgjJ50483I",
  "published": "2025-06-16T09:29:54Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/tUt6lVCsNjU",
    "published": "2025-06-16T09:29:54Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/VCrd_ylSAFg",
  "published": "2025-06-16T09:30:05Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/gSy-lgLwCcA",
    "published": "2025-06-16T09:30:05Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/GUn8tcbKBsg",
  "published": "2025-06-16T09:30:16Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/MrI01rmASrY",
    "published": "2025-06-16T09:30:16Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/0SDyffbwL6U",
  "published": "2025-06-16T09:30:27Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/hJncqlLQT94",
    "published": "2025-06-16T09:30:27Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/ghP-hfpnUws",
  "published": "2025-06-16T09:30:38Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/SctkvdJNHLE",
    "published": "2025-06-16T09:30:38Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/-fU9aUxrxAA",
  "published": "2025-06-16T09:30:48Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/nKAgrxK5TsM",
    "published": "2025-06-16T09:30:48Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/Rz8G0W4sXWs",
  "published": "2025-06-16T09:30:59Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/yT3Dywsk_Zw",
    "published": "2025-06-16T09:30:59Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/WRPkJP7bpgk",
  "published": "2025-06-16T09:31:10Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/_Z5PdIozcR4",
    "published": "2025-06-16T09:31:10Z",
    "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": [
    "https://www.w3.org/ns/activitystreams#Public",
    "http://misskey/users/a92fy09mup5x0003"
  ],
  "id": "http://pasture-one-actor/actor/HwmXJzyqde8",
  "published": "2025-06-16T09:31:21Z",
  "object": {
    "type": "Note",
    "attributedTo": "http://pasture-one-actor/actor",
    "to": [
      "https://www.w3.org/ns/activitystreams#Public",
      "http://misskey/users/a92fy09mup5x0003"
    ],
    "id": "http://pasture-one-actor/actor/KkTl9OxzEFk",
    "published": "2025-06-16T09:31:21Z",
    "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"
        }
      ]
    }
  }
}