diff --git a/lib/gslide/models/presentation.rb b/lib/gslide/models/presentation.rb
index 127573c..325d18a 100644
--- a/lib/gslide/models/presentation.rb
+++ b/lib/gslide/models/presentation.rb
@@ -7,8 +7,10 @@ class Presentation
 
       attr_reader :id
 
-      def initialize(id, auth: nil)
-        @id = id
+      PRESENTATION_PATTERN = %r[/presentation/d/([a-zA-Z0-9\-_]+)?]
+
+      def initialize(id_or_url, auth: nil)
+        @id = (url_id = id_or_url.match(PRESENTATION_PATTERN)) ? url_id[1] : id_or_url
         @auth = auth
       end
 
diff --git a/test/test_gslide.rb b/test/test_gslide.rb
index 4d3b7e2..e3be75f 100644
--- a/test/test_gslide.rb
+++ b/test/test_gslide.rb
@@ -7,7 +7,17 @@ def test_that_it_has_a_version_number
     refute_nil ::Gslide::VERSION
   end
 
-  # def test_it_does_something_useful
-  #   assert false
-  # end
+  def test_initialized_presentation_with_url
+    url = "https://docs.google.com/presentation/d/1W11pzmSEH7EoZXiMITa-cOM1y9Ym6Yby9pj_2l5NPm8/edit?usp=sharing"
+
+    presentation = Gslide::Presentation.new(url, auth: nil)
+    assert_equal "1W11pzmSEH7EoZXiMITa-cOM1y9Ym6Yby9pj_2l5NPm8", presentation.id
+  end
+
+  def test_initialized_with_presentation_id
+    presentation_id = "1W11pzmSEH7EoZXiMITa-cOM1y9Ym6Yby9pj_2l5NPm8"
+
+    presentation = Gslide::Presentation.new(presentation_id, auth: nil)
+    assert_equal "1W11pzmSEH7EoZXiMITa-cOM1y9Ym6Yby9pj_2l5NPm8", presentation.id
+  end
 end