diff --git a/bdfr/resource.py b/bdfr/resource.py
index 12c9cc4..be6aaaf 100644
--- a/bdfr/resource.py
+++ b/bdfr/resource.py
@@ -64,7 +64,7 @@ class Resource:
         self.hash = hashlib.md5(self.content)
 
     def _determine_extension(self) -> Optional[str]:
-        extension_pattern = re.compile(r'.*(\..{3,5})(?:\?.*)?$')
+        extension_pattern = re.compile(r'.*(\..{3,5})(?:\?.*)?(?:#.*)?$')
         match = re.search(extension_pattern, self.url)
         if match:
             return match.group(1)
diff --git a/bdfr/tests/test_resource.py b/bdfr/tests/test_resource.py
index 0a8e145..de6030b 100644
--- a/bdfr/tests/test_resource.py
+++ b/bdfr/tests/test_resource.py
@@ -15,6 +15,8 @@ from bdfr.resource import Resource
     ('https://www.resource.com/test/example.jpg', '.jpg'),
     ('hard.png.mp4', '.mp4'),
     ('https://preview.redd.it/7zkmr1wqqih61.png?width=237&format=png&auto=webp&s=19de214e634cbcad99', '.png'),
+    ('test.jpg#test','.jpg'),
+    ('test.jpg?width=247#test','.jpg'),
 ))
 def test_resource_get_extension(test_url: str, expected: str):
     test_resource = Resource(MagicMock(), test_url)