diff --git a/atproto.py b/atproto.py
index d7a56bed..9c76f252 100644
--- a/atproto.py
+++ b/atproto.py
@@ -833,6 +833,8 @@ def _convert(cls, obj, fetch_blobs=False, from_user=None):
             return {}
 
         obj_as1 = obj.as1
+        blobs = {}  # maps str URL to dict blob object
+        aspect_ratios = {}  # maps str URL to (int width, int height) tuple
 
         def fetch_blob(url, blob_field, name, check_size=True, check_type=True):
             if url and url not in blobs:
@@ -843,10 +845,11 @@ def fetch_blob(url, blob_field, name, check_size=True, check_type=True):
                         url=url, get_fn=util.requests_get, max_size=max_size,
                         accept_types=accept)
                     blobs[url] = blob.as_object()
+                    if blob.width and blob.height:
+                        aspect_ratios[url] = (blob.width, blob.height)
                 except (RequestException, ValidationError) as e:
                     logger.info(f'failed, skipping {url} : {e}')
 
-        blobs = {}  # maps str URL to dict blob object
         if fetch_blobs:
             for o in obj.as1, as1.get_object(obj.as1):
                 for url in util.get_urls(o, 'image'):
@@ -878,8 +881,8 @@ def fetch_blob(url, blob_field, name, check_size=True, check_type=True):
         as_embed = obj.atom or obj.rss
         try:
             ret = bluesky.from_as1(cls.translate_ids(obj.as1), blobs=blobs,
-                                   client=client, original_fields_prefix='bridgy',
-                                   as_embed=as_embed)
+                                   aspects=aspect_ratios, client=client,
+                                   original_fields_prefix='bridgy', as_embed=as_embed)
         except (ValueError, RequestException):
             logger.info(f"Couldn't convert to ATProto", exc_info=True)
             return {}
diff --git a/tests/activitypub_logo.png b/tests/activitypub_logo.png
new file mode 100644
index 00000000..d2ec7928
Binary files /dev/null and b/tests/activitypub_logo.png differ
diff --git a/tests/test_atproto.py b/tests/test_atproto.py
index 6ad46bcc..681791ab 100644
--- a/tests/test_atproto.py
+++ b/tests/test_atproto.py
@@ -1,6 +1,7 @@
 """Unit tests for atproto.py."""
 import base64
 import copy
+from pathlib import Path
 from unittest import skip
 from unittest.mock import ANY, call, MagicMock, patch
 
@@ -736,6 +737,38 @@ def test_convert_fetch_blobs_true_video_type_not_in_accept(self, mock_get):
         self.assertEqual(0, AtpRemoteBlob.query().count())
         mock_get.assert_has_calls([self.req('https://my/vid')])
 
+    @patch('requests.get', return_value=requests_response(
+        Path(__file__).with_name('activitypub_logo.png').read_bytes(),
+        content_type='image/png'))
+    def test_convert_fetch_blobs_true_image_aspect_ratio(self, mock_get):
+        cid = CID.decode('bafkreiefedbx7vctqxskqog5o3x2s4hnkchx7ml5aqwdbccgkzuis2ptya')
+        self.assertEqual({
+            '$type': 'app.bsky.feed.post',
+            'text': '',
+            'createdAt': '2022-01-02T03:04:05.000Z',
+            'embed': {
+                '$type': 'app.bsky.embed.images',
+                'images': [{
+                    '$type': 'app.bsky.embed.images#image',
+                    'alt': '',
+                    'image': {
+                        '$type': 'blob',
+                        'mimeType': 'image/png',
+                        'ref': cid,
+                        'size': 8644,
+                    },
+                    'aspectRatio': {
+                        'width': 260,
+                        'height': 164,
+                    },
+                }],
+            },
+        }, ATProto.convert(Object(our_as1={
+            'objectType': 'note',
+            'image': [{'url': 'http://my/pic/1'}],
+        }), fetch_blobs=True))
+        mock_get.assert_has_calls([self.req('http://my/pic/1')])
+
     @patch('requests.get', side_effect=[
         requests_response(status=404),
         requests_response('second blob contents', content_type='image/png')