diff --git a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
index 3175427ad..a99b40adc 100644
--- a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
@@ -21,6 +21,8 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
       field(:type, :string)
       field(:href, ObjectValidators.Uri)
       field(:mediaType, :string, default: "application/octet-stream")
+      field(:width, :integer)
+      field(:height, :integer)
     end
   end
 
@@ -52,7 +54,7 @@ def url_changeset(struct, data) do
     data = fix_media_type(data)
 
     struct
-    |> cast(data, [:type, :href, :mediaType])
+    |> cast(data, [:type, :href, :mediaType, :width, :height])
     |> validate_inclusion(:type, ["Link"])
     |> validate_required([:type, :href, :mediaType])
   end
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 4d9a5617e..b5767863c 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -245,6 +245,8 @@ def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachm
               "type" => Map.get(url || %{}, "type", "Link")
             }
             |> Maps.put_if_present("mediaType", media_type)
+            |> Maps.put_if_present("width", (url || %{})["width"])
+            |> Maps.put_if_present("height", (url || %{})["height"])
 
           %{
             "url" => [attachment_url],
diff --git a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
index b775515e0..0e49fda99 100644
--- a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
@@ -72,5 +72,38 @@ test "it handles our own uploads" do
 
       assert attachment.mediaType == "image/jpeg"
     end
+
+    test "it handles image dimensions" do
+      attachment = %{
+        "url" => [
+          %{
+            "type" => "Link",
+            "mediaType" => "image/jpeg",
+            "href" => "https://example.com/images/1.jpg",
+            "width" => 200,
+            "height" => 100
+          }
+        ],
+        "type" => "Document",
+        "name" => nil,
+        "mediaType" => "image/jpeg"
+      }
+
+      {:ok, attachment} =
+        AttachmentValidator.cast_and_validate(attachment)
+        |> Ecto.Changeset.apply_action(:insert)
+
+      assert [
+               %{
+                 href: "https://example.com/images/1.jpg",
+                 type: "Link",
+                 mediaType: "image/jpeg",
+                 width: 200,
+                 height: 100
+               }
+             ] = attachment.url
+
+      assert attachment.mediaType == "image/jpeg"
+    end
   end
 end
diff --git a/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
index e733f167d..a21e9e3d3 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/audio_handling_test.exs
@@ -76,7 +76,9 @@ test "Funkwhale Audio object" do
                    "href" =>
                      "https://channels.tests.funkwhale.audio/api/v1/listen/3901e5d8-0445-49d5-9711-e096cf32e515/?upload=42342395-0208-4fee-a38d-259a6dae0871&download=false",
                    "mediaType" => "audio/ogg",
-                   "type" => "Link"
+                   "type" => "Link",
+                   "width" => nil,
+                   "height" => nil
                  }
                ]
              }
diff --git a/test/pleroma/web/activity_pub/transmogrifier/video_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/video_handling_test.exs
index 6ddf7c172..62b4a2cb3 100644
--- a/test/pleroma/web/activity_pub/transmogrifier/video_handling_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier/video_handling_test.exs
@@ -60,7 +60,9 @@ test "it remaps video URLs as attachments if necessary" do
                    "href" =>
                      "https://peertube.moe/static/webseed/df5f464b-be8d-46fb-ad81-2d4c2d1630e3-480.mp4",
                    "mediaType" => "video/mp4",
-                   "type" => "Link"
+                   "type" => "Link",
+                   "width" => nil,
+                   "height" => nil
                  }
                ]
              }
@@ -83,7 +85,9 @@ test "it remaps video URLs as attachments if necessary" do
                    "href" =>
                      "https://framatube.org/static/webseed/6050732a-8a7a-43d4-a6cd-809525a1d206-1080.mp4",
                    "mediaType" => "video/mp4",
-                   "type" => "Link"
+                   "type" => "Link",
+                   "width" => nil,
+                   "height" => nil
                  }
                ]
              }
@@ -113,7 +117,9 @@ test "it works for peertube videos with only their mpegURL map" do
                    "href" =>
                      "https://peertube.stream/static/streaming-playlists/hls/abece3c3-b9c6-47f4-8040-f3eed8c602e6/abece3c3-b9c6-47f4-8040-f3eed8c602e6-1080-fragmented.mp4",
                    "mediaType" => "video/mp4",
-                   "type" => "Link"
+                   "type" => "Link",
+                   "width" => nil,
+                   "height" => nil
                  }
                ]
              }