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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. firefish, store the image description on a per image URL basis and not for every instance of an image reference.

Support table

attachment akkoma 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 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
[
  {
    “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”: “01K1G02WGFYDDZ4993ZTMSV3EN”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02WGFYDDZ4993ZTMSV3EN.png”,
  “text_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02WGFYDDZ4993ZTMSV3EN.png”,
  “preview_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/small/01K1G02WGFYDDZ4993ZTMSV3EN.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”: “L49Bjay=fQy=y=kBfQkBfQfQfQfQ”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “01K1G02X62K35K6N66M6MP4TQA”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02X62K35K6N66M6MP4TQA.png”,
  “text_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02X62K35K6N66M6MP4TQA.png”,
  “preview_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/small/01K1G02X62K35K6N66M6MP4TQA.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”: “L42.4{l+fQl+l+ffQffQfQfQfQ”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “01K1G02XVVJ7R2QGTKQ9ZK3X15”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02XVVJ7R2QGTKQ9ZK3X15.png”,
  “text_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02XVVJ7R2QGTKQ9ZK3X15.png”,
  “preview_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/small/01K1G02XVVJ7R2QGTKQ9ZK3X15.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”: “01K1G02YG7ZQ4CRFVFQFED77DZ”,
  “type”: “image”,
  “url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02YG7ZQ4CRFVFQFED77DZ.png”,
  “text_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/original/01K1G02YG7ZQ4CRFVFQFED77DZ.png”,
  “preview_url”: “http://gotosocial/fileserver/01K1G0072548GTA3W6MWNX04WC/attachment/small/01K1G02YG7ZQ4CRFVFQFED77DZ.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”: “019888cc-e420-7e77-a8d8-018c32cacb86”,
  “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”: “019888cc-e6f3-7782-8f54-7dd63337762b”,
  “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”: “019888cc-e9df-77c8-84c5-cfaba7dfba76”,
  “type”: “text”,
  “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”: “019888cc-ecfa-72a6-8fd8-eba8fcb27bdc”,
  “type”: “text”,
  “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”: “114992251206563439”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/114/992/251/206/563/439/original/a81c0b85768e6133.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/114/992/251/206/563/439/small/a81c0b85768e6133.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”: “U21-milzfQlzlzfjfQfjfQfQfQfQlzfjfQfj”
}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
  “id”: “114992251272744426”,
  “type”: “image”,
  “url”: “http://localhost:2970/system/cache/media_attachments/files/114/992/251/272/744/426/original/1fa42c1560d06cee.png”,
  “preview_url”: “http://localhost:2970/system/cache/media_attachments/files/114/992/251/272/744/426/small/1fa42c1560d06cee.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”: “U05+p=uifQuiuifkfQfkfQfQfQfQuifkfQfk”
}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
    “name”: “name”,
    “imageType”: “image/jpeg”
  }
]
{
  “id”: “114992251344584123”,
  “type”: “unknown”,
  “url”: “http://mastodon/media_proxy/114992251344584123/original”,
  “preview_url”: “http://mastodon/media_proxy/114992251344584123/small”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
  “text_url”: null,
  “meta”: null,
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}
[
  {
    “type”: “Document”,
    “url”: “http://pasture-one-actor/assets/FediverseLogo.png”
  }
]
{
  “id”: “114992251408801374”,
  “type”: “unknown”,
  “url”: “http://mastodon/media_proxy/114992251408801374/original”,
  “preview_url”: “http://mastodon/media_proxy/114992251408801374/small”,
  “remote_url”: “http://pasture-one-actor/assets/FediverseLogo.png”,
  “preview_remote_url”: null,
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}
attachment files fileIds Example
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”
}
[
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    “createdAt”: “2025-07-31T11:51:20.080Z”,
    “name”: “100.png”,
    “type”: “image/png”,
    “md5”: “9654c53c2563721f95899039a2629e6c”,
    “size”: 0,
    “isSensitive”: false,
    “blurhash”: “e3EJLu$qfQ$qfQ$qjufQjufQfQfQfQfQfQ$qjufQjufQfQfQfQfQfQ”,
    “properties”: {
      “width”: 40,
      “height”: 40
    },
    “url”: “http://pasture-one-actor/images/100.png”,
    “thumbnailUrl”: “http://pasture-one-actor/images/100.png”,
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[
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{
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  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
[
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    “size”: 0,
    “isSensitive”: false,
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    “properties”: {
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      “height”: 40
    },
    “url”: “http://pasture-one-actor/images/100.png”,
    “thumbnailUrl”: “http://pasture-one-actor/images/100.png”,
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[
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attachment media_attachments Example
{
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  “url”: “http://pasture-one-actor/images/100.png”
}
{
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}
{
  “type”: “Document”,
  “url”: “http://pasture-one-actor/images/100.png”,
  “name”: “name”,
  “summary”: “summary”,
  “content”: “content”
}
{
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}
[
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    “imageType”: “image/jpeg”
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}
[
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{
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