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Image Description

The Image type is defined in ActivityStreams Vocabulary.

In this support table, we only consider how the image description, commonly called AltText is handled. Image descriptions are important from an accessibility standpoint, see WCAG 2.2. Text Alternatives.

It seems that certain implementations, e.g. misskey, store the image description on a per image URL basis and not for every instance of an image reference.

Support table

attachment akkoma friendica gotosocial hollo mastodon misskey mitra pleroma sharkey
no description
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
- - - - - - - - -
name and summary
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
name name summary summary summary name name summary name
only name
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
name name name name name name name name name
no comment in attachment
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
- - - - - name - - name

Details

attachment media_attachments Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “blurhash”: null,
  “description”: null,
  “id”: “983810756”,
  “pleroma”: {
    “mime_type”: “application/octet-stream”
  },
  “preview_url”: “http://pasture-one-actor/images/100.png”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “text_url”: “http://pasture-one-actor/images/100.png”,
  “type”: “unknown”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “blurhash”: null,
  “description”: “name”,
  “id”: “983810756”,
  “pleroma”: {
    “mime_type”: “application/octet-stream”
  },
  “preview_url”: “http://pasture-one-actor/images/100.png”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “text_url”: “http://pasture-one-actor/images/100.png”,
  “type”: “unknown”,
  “url”: “http://pasture-one-actor/images/100.png”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “blurhash”: null,
  “description”: “name”,
  “id”: “-751667840”,
  “pleroma”: {
    “mime_type”: “application/octet-stream”
  },
  “preview_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “text_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “type”: “unknown”,
  “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “blurhash”: null,
  “description”: null,
  “id”: “-751667840”,
  “pleroma”: {
    “mime_type”: “application/octet-stream”
  },
  “preview_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “text_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “type”: “unknown”,
  “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
}
attachment media_attachments Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “id”: “9”,
  “type”: “image”,
  “url”: “http://friendica/photo/preview/9”,
  “preview_url”: “http://friendica/photo/preview/640/9”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “text_url”: “http://pasture-one-actor/images/100.png”,
  “description”: null,
  “blurhash”: “|23m;+p2fQp2fQp2fQp2fQp2fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQp2fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQp2fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQp2fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQ”,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    }
  }
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “11”,
  “type”: “image”,
  “url”: “http://friendica/photo/preview/11”,
  “preview_url”: “http://friendica/photo/preview/640/11”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “text_url”: “http://pasture-one-actor/images/100.png”,
  “description”: “name”,
  “blurhash”: “|6QsTS}vfQ}vfQ}vfQ}vfQ}vj[fQj[fQj[fQj[fQfQfQfQfQfQfQfQfQfQ}vj[fQj[fQj[fQj[fQfQfQfQfQfQfQfQfQfQ}vj[fQj[fQj[fQj[fQfQfQfQfQfQfQfQfQfQ}vj[fQj[fQj[fQj[fQfQfQfQfQfQfQfQfQfQ”,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    }
  }
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “13”,
  “type”: “image”,
  “url”: “http://friendica/photo/preview/13”,
  “preview_url”: “http://friendica/photo/preview/640/13”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “text_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “description”: “name”,
  “blurhash”: “|JDSH{.}0eT?ImEdK5TVi}fnhEVw[xvRrRQXlW-4rK[N1$S=^VtkW#Co@5cO?ROX2$yRoa+xs;ARM{tki%t7t9m@tLRktUa7xmrvRhXKNMXRjJwExawPi^I^XSSbRpxsRWxm#kOtI]nlozNGotIwoOxsSbNFn%xsV{V]”,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1
    }
  }
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “id”: “15”,
  “type”: “image”,
  “url”: “http://friendica/photo/preview/15”,
  “preview_url”: “http://friendica/photo/preview/640/15”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “text_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “description”: null,
  “blurhash”: “|JDSH{.}0eT?ImEdK5TVi}fnhEVw[xvRrRQXlW-4rK[N1$S=^VtkW#Co@5cO?ROX2$yRoa+xs;ARM{tki%t7t9m@tLRktUa7xmrvRhXKNMXRjJwExawPi^I^XSSbRpxsRWxm#kOtI]nlozNGotIwoOxsSbNFn%xsV{V]”,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1
    }
  }
}
attachment media_attachments Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “id”: “01K4Q0S8ZAM2Y03J6NDHK2M0NY”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0S8ZAM2Y03J6NDHK2M0NY.png”,
  “text_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0S8ZAM2Y03J6NDHK2M0NY.png”,
  “preview_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/small/01K4Q0S8ZAM2Y03J6NDHK2M0NY.jpg”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “preview_remote_url”: null,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    },
    “small”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: null,
  “blurhash”: “L3JsRc}@fQ}@}@oLfQoLfQfQfQfQ”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “01K4Q0S9N0RJSXJDV229X9SS4Y”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0S9N0RJSXJDV229X9SS4Y.png”,
  “text_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0S9N0RJSXJDV229X9SS4Y.png”,
  “preview_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/small/01K4Q0S9N0RJSXJDV229X9SS4Y.jpg”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “preview_remote_url”: null,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    },
    “small”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: “summary”,
  “blurhash”: “L1E3C.~qfQ~q~qoffQoffQfQfQfQ”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “01K4Q0SAAFEQ4R17Z4Y3CDTA9D”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0SAAFEQ4R17Z4Y3CDTA9D.png”,
  “text_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0SAAFEQ4R17Z4Y3CDTA9D.png”,
  “preview_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/small/01K4Q0SAAFEQ4R17Z4Y3CDTA9D.jpg”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: “name”,
  “blurhash”: “LIB{x~.}9Fcn}gnOEUxBDlK[N1wi”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “id”: “01K4Q0SAZVEPSNC61B97403CEH”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0SAZVEPSNC61B97403CEH.png”,
  “text_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/original/01K4Q0SAZVEPSNC61B97403CEH.png”,
  “preview_url”: “http://gotosocial/fileserver/01K4Q0NT3HSFK1SRH2DNH7B8TT/attachment/small/01K4Q0SAZVEPSNC61B97403CEH.jpg”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: null,
  “blurhash”: “LIB{x~.}9Fcn}gnOEUxBDlK[N1wi”
}
attachment media_attachments Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “id”: “01995cb3-cd6e-7ecc-9567-ca97e13b6517”,
  “type”: “image”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “preview_url”: “http://pasture-one-actor/images/100.png”,
  “remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: null,
  “blurhash”: null
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “01995cb3-d074-78f1-b1db-6bb3e565a791”,
  “type”: “image”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “preview_url”: “http://pasture-one-actor/images/100.png”,
  “remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: “summary”,
  “blurhash”: null
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “01995cb3-d34d-720b-b20a-da0465357849”,
  “type”: “image”,
  “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: “name”,
  “blurhash”: null
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “id”: “01995cb3-d879-76ad-936b-9c89d9f05d1b”,
  “type”: “image”,
  “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “small”: {
      “width”: 512,
      “height”: 512,
      “size”: “512x512”,
      “aspect”: 1
    },
    “focus”: {
      “x”: 0,
      “y”: 0
    }
  },
  “description”: null,
  “blurhash”: null
}
attachment media_attachments Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
{
  “id”: “115215545827216683”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/827/216/683/original/d1e400909febd5c1.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/827/216/683/small/d1e400909febd5c1.png”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “preview_remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1.0
    },
    “small”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1.0
    }
  },
  “description”: null,
  “blurhash”: “U1M^@Y|xfQ|x|xjtfQjtfQfQfQfQ|xjtfQjt”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “115215545895591405”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/895/591/405/original/98273f9facd40b28.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/895/591/405/small/98273f9facd40b28.png”,
  “remote_url”: “http://pasture-one-actor/images/100.png”,
  “preview_remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1.0
    },
    “small”: {
      “width”: 40,
      “height”: 40,
      “size”: “40x40”,
      “aspect”: 1.0
    }
  },
  “description”: “summary”,
  “blurhash”: “U19ef=uifQuiuifkfQfkfQfQfQfQuifkfQfk”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “115215545962977447”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/962/977/447/original/bbe0d194c24ec4a4.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/545/962/977/447/small/bbe0d194c24ec4a4.png”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1.0
    },
    “small”: {
      “width”: 480,
      “height”: 480,
      “size”: “480x480”,
      “aspect”: 1.0
    }
  },
  “description”: “name”,
  “blurhash”: “UOEVB2.}4.T=}fjEEVw[4=K[RUw~9,TJV?bW”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “id”: “115215546027875463”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/546/027/875/463/original/255fa0fd07cf20f3.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/215/546/027/875/463/small/255fa0fd07cf20f3.png”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
  “text_url”: null,
  “meta”: {
    “original”: {
      “width”: 1548,
      “height”: 1548,
      “size”: “1548x1548”,
      “aspect”: 1.0
    },
    “small”: {
      “width”: 480,
      “height”: 480,
      “size”: “480x480”,
      “aspect”: 1.0
    }
  },
  “description”: null,
  “blurhash”: “UOEVB2.}4.T=}fjEEVw[4=K[RUw~9,TJV?bW”
}
attachment files fileIds Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
[
  {
    “id”: “acg1xs1yvoex002d”,
    “createdAt”: “2025-09-09T11:49:03.430Z”,
    “name”: “100.png”,
    “type”: “image/png”,
    “md5”: “59c1c19d259a40b046ec634bd3edda52”,
    “size”: 0,
    “isSensitive”: false,
    “blurhash”: “e3QN#1}DfQ}DfQ}DjtfQjtfQfQfQfQfQfQ}DjtfQjtfQfQfQfQfQfQ”,
    “properties”: {
      “width”: 40,
      “height”: 40
    },
    “url”: “http://pasture-one-actor/images/100.png”,
    “thumbnailUrl”: “http://pasture-one-actor/images/100.png”,
    “comment”: null,
    “folderId”: null,
    “folder”: null,
    “userId”: “acg1vki1voex0003”,
    “user”: null
  }
]
[
  “acg1xs1yvoex002d”
]
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
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