diff --git a/QtScrcpy/device/device.cpp b/QtScrcpy/device/device.cpp
index a4f0ce0..3a95f3a 100644
--- a/QtScrcpy/device/device.cpp
+++ b/QtScrcpy/device/device.cpp
@@ -130,6 +130,7 @@ void Device::initSignals()
                 // update ui
                 if (m_videoForm) {
                     m_videoForm->setWindowTitle(deviceName);
+                    m_videoForm->updateScreenRatio(size);
                     m_videoForm->updateShowSize(size);
                 }
 
diff --git a/QtScrcpy/device/ui/videoform.cpp b/QtScrcpy/device/ui/videoform.cpp
index 57a8465..4eb75bf 100644
--- a/QtScrcpy/device/ui/videoform.cpp
+++ b/QtScrcpy/device/ui/videoform.cpp
@@ -112,11 +112,15 @@ void VideoForm::updateStyleSheet(bool vertical)
     }
 }
 
+void VideoForm::updateScreenRatio(const QSize &newSize)
+{
+    m_widthHeightRatio = 1.0f * qMin(newSize.width(),newSize.height()) / qMax(newSize.width(),newSize.height());
+}
+
 void VideoForm::updateShowSize(const QSize &newSize)
 {
     if (frameSize != newSize) {
         frameSize = newSize;
-
         bool vertical = newSize.height() > newSize.width();
         QSize showSize = newSize;
         QDesktopWidget* desktop = QApplication::desktop();
diff --git a/QtScrcpy/device/ui/videoform.h b/QtScrcpy/device/ui/videoform.h
index 31327d2..f03a045 100644
--- a/QtScrcpy/device/ui/videoform.h
+++ b/QtScrcpy/device/ui/videoform.h
@@ -21,6 +21,7 @@ public:
 
     void switchFullScreen();    
     void staysOnTop(bool top = true);
+    void updateScreenRatio(const QSize &newSize);
     void updateShowSize(const QSize &newSize);
     void updateRender(const AVFrame *frame);
     void setController(Controller *controller);