diff --git a/YACReader/viewer.cpp b/YACReader/viewer.cpp
index d930c8cd..eef11f61 100644
--- a/YACReader/viewer.cpp
+++ b/YACReader/viewer.cpp
@@ -372,6 +372,45 @@ void Viewer::updateContentSize()
 	content->update(); //TODO, it shouldn't be neccesary
 }
 
+void Viewer::increaseZoomFactor()
+{
+	zoom += 0.1;
+	if (zoom > 5)
+	{
+		zoom = 5;
+	}
+	updateContentSize();
+	notificationsLabel->setText(QString::number(getZoomFactor()*100)+"%");
+	notificationsLabel->flash();
+}
+void Viewer::decreaseZoomFactor()
+{
+	zoom -= 0.1;
+	if (zoom < 0.1)
+		zoom = 0.1;
+	updateContentSize();
+	notificationsLabel->setText(QString::number(getZoomFactor()*100)+"%");
+	notificationsLabel->flash();
+}
+
+qreal Viewer::getZoomFactor()
+{
+	//this function is a placeholder for future refactoring work
+	return zoom;
+}
+
+void Viewer::setZoomFactor(qreal z)
+{
+	//this function is mostly used to reset the zoom after a fitmode switch
+	if (z > 5)
+		zoom = 5;
+	else if (z < 0.1)
+		zoom = 0.1;
+	else
+		zoom = z;
+//	updateContentSize()
+}
+
 void Viewer::updateVerticalScrollBar()
 {
 	if(direction > 0)
diff --git a/YACReader/viewer.h b/YACReader/viewer.h
index 44270da0..856985c7 100644
--- a/YACReader/viewer.h
+++ b/YACReader/viewer.h
@@ -37,6 +37,11 @@ class NotificationsLabelWidget;
 	public:
 		bool fullscreen; //TODO, change by the right use of windowState();
 	public slots:
+		void increaseZoomFactor();
+		void decreaseZoomFactor();
+		void setZoomFactor(qreal);
+		qreal getZoomFactor();
+	
 		void prepareForOpening();
 		void open(QString pathFile, int atPage = -1);
 		void open(QString pathFile, const ComicDB & comic);