diff --git a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
index d69931c..f461e6e 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml.cs
@@ -1,4 +1,4 @@
-// Copyright © 2018 Paddy Xu
+// Copyright © 2018 Paddy Xu
 // 
 // This file is part of QuickLook program.
 // 
@@ -79,6 +79,7 @@ namespace QuickLook.Plugin.ImageViewer
             viewPanel.PreviewMouseWheel += ViewPanel_PreviewMouseWheel;
             viewPanel.MouseLeftButtonDown += ViewPanel_MouseLeftButtonDown;
             viewPanel.MouseMove += ViewPanel_MouseMove;
+            viewPanel.MouseDoubleClick += ViewPanel_MouseDoubleClick;
 
             viewPanel.ManipulationInertiaStarting += ViewPanel_ManipulationInertiaStarting;
             viewPanel.ManipulationStarting += ViewPanel_ManipulationStarting;
@@ -341,6 +342,11 @@ namespace QuickLook.Plugin.ImageViewer
             _dragInitPos = temp;
         }
 
+        private void ViewPanel_MouseDoubleClick(object sender, MouseButtonEventArgs e) 
+        {
+            DoZoomToFit();
+        }
+
         private void ViewPanel_MouseMove(object sender, MouseEventArgs e)
         {
             if (!_dragInitPos.HasValue)