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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
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
- - - - - - - - -
{
  “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
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
name name name name name name name name name
[
  {
    “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”: “|70?QTg+fQg+fQg+fQg+fQg+fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQg+fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQg+fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQg+fkfQfkfQfkfQfkfQfQfQfQfQfQfQfQfQfQ”,
  “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”: “|0BgRW~jfQ~jfQ~jfQ~jfQ~jkAfQkAfQkAfQkAfQfQfQfQfQfQfQfQfQfQ~jkAfQkAfQkAfQkAfQfQfQfQfQfQfQfQfQfQ~jkAfQkAfQkAfQkAfQfQfQfQfQfQfQfQfQfQ~jkAfQkAfQkAfQkAfQfQfQfQfQfQfQfQfQfQ”,
  “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”: “01K48D7YGVEYYZMZ6HQZ579ET0”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7YGVEYYZMZ6HQZ579ET0.png”,
  “text_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7YGVEYYZMZ6HQZ579ET0.png”,
  “preview_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/small/01K48D7YGVEYYZMZ6HQZ579ET0.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”: “L8K54x,hfQ,h,hjvfQjvfQfQfQfQ”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “01K48D7Z5XH530WFHXGK9PXD6Q”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7Z5XH530WFHXGK9PXD6Q.png”,
  “text_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7Z5XH530WFHXGK9PXD6Q.png”,
  “preview_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/small/01K48D7Z5XH530WFHXGK9PXD6Q.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”: “L14z:Cu5fQu5u5j[fQj[fQfQfQfQ”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “01K48D7ZTM4PV78EPWTY9XBF0X”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7ZTM4PV78EPWTY9XBF0X.png”,
  “text_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D7ZTM4PV78EPWTY9XBF0X.png”,
  “preview_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/small/01K48D7ZTM4PV78EPWTY9XBF0X.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”: “01K48D80GHNHRDRGQ1FSMP4T70”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D80GHNHRDRGQ1FSMP4T70.png”,
  “text_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/original/01K48D80GHNHRDRGQ1FSMP4T70.png”,
  “preview_url”: “http://gotosocial/fileserver/01K48D4GXYW9KT1VG7A7FX4SYD/attachment/small/01K48D80GHNHRDRGQ1FSMP4T70.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”: “019910dd-c679-7eeb-8f26-5b150b738981”,
  “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”: “019910dd-c988-7666-b4a4-37d808c35b09”,
  “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”: “019910dd-cc81-7efd-bff9-7c150073ad79”,
  “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”: “019910dd-d1d5-74c7-b2c5-0a2862db3daf”,
  “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”: “115141859621678144”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/621/678/144/original/b96c715351ec0677.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/621/678/144/small/b96c715351ec0677.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”: “U1PILS|+fQ|+|+jufQjufQfQfQfQ|+jufQju”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “115141859706231196”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/706/231/196/original/a3f8933b8b7d9d2d.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/706/231/196/small/a3f8933b8b7d9d2d.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”: “U0I;2G~QfQ~Q~Qj@fQj@fQfQfQfQ~Qj@fQj@”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “115141859780531263”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/780/531/263/original/40304eb2813c0666.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/780/531/263/small/40304eb2813c0666.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”: “115141859847402513”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/847/402/513/original/461605d920e445c7.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/115/141/859/847/402/513/small/461605d920e445c7.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”: “ac7wngbv3t7j002d”,
    “createdAt”: “2025-09-03T18:58:54.187Z”,
    “name”: “100.png”,
    “type”: “image/png”,
    “md5”: “eca9bcd9157040cad0aa6c3e9be0dfc9”,
    “size”: 0,
    “isSensitive”: false,
    “blurhash”: “e08#1#-;fQ-;fQ-;j[fQj[fQfQfQfQfQfQ-;j[fQj[fQfQfQfQfQfQ”,
    “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”: “ac7wl9qt3t7j0003”,
    “user”: null
  }
]
[
  “ac7wngbv3t7j002d”
]
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
[
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