diff --git a/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsBackend.java b/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsBackend.java
index c464d34..af69c93 100644
--- a/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsBackend.java
+++ b/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsBackend.java
@@ -18,11 +18,11 @@
  
 package ru.windcorp.progressia.client.graphics.backend;
 
-import static org.lwjgl.opengl.GL11.*;
-
 import glm.vec._2.i.Vec2i;
+import org.lwjgl.glfw.GLFWVidMode;
 
 import static org.lwjgl.glfw.GLFW.*;
+import static org.lwjgl.opengl.GL11.*;
 
 public class GraphicsBackend {
 
@@ -38,6 +38,8 @@ public class GraphicsBackend {
 
 	private static boolean faceCullingEnabled = false;
 
+	private static boolean isFullscreen = false;
+
 	private GraphicsBackend() {
 	}
 
@@ -128,4 +130,33 @@ public class GraphicsBackend {
 		faceCullingEnabled = useFaceCulling;
 	}
 
+	public static boolean isFullscreen() {
+		return isFullscreen;
+	}
+
+	public static void setFullscreen() {
+		GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+		glfwSetWindowMonitor(
+			getWindowHandle(),
+			glfwGetPrimaryMonitor(),
+			0,
+			0,
+			vidmode.width(),
+			vidmode.height(),
+			0);
+		isFullscreen = true;
+	}
+
+	public static void setWindowed() {
+		GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+		glfwSetWindowMonitor(
+			getWindowHandle(),
+			0,
+			(vidmode.width() - getFrameWidth()) / 2,
+			(vidmode.height() - getFrameHeight()) / 2,
+			getFrameWidth(),
+			getFrameHeight(),
+			0);
+		isFullscreen = false;
+	}
 }
diff --git a/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsInterface.java b/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsInterface.java
index 9af984f..be32b4c 100644
--- a/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsInterface.java
+++ b/src/main/java/ru/windcorp/progressia/client/graphics/backend/GraphicsInterface.java
@@ -73,4 +73,12 @@ public class GraphicsInterface {
 		GraphicsBackend.startNextLayer();
 	}
 
+	public static void makeFullscreen(boolean state) {
+		if (state) {
+			GraphicsBackend.setFullscreen();
+		} else {
+			GraphicsBackend.setWindowed();
+		}
+	}
+
 }
diff --git a/src/main/java/ru/windcorp/progressia/test/LayerTestGUI.java b/src/main/java/ru/windcorp/progressia/test/LayerTestGUI.java
index 30cca35..9d7b8fb 100755
--- a/src/main/java/ru/windcorp/progressia/test/LayerTestGUI.java
+++ b/src/main/java/ru/windcorp/progressia/test/LayerTestGUI.java
@@ -18,16 +18,12 @@
  
 package ru.windcorp.progressia.test;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Objects;
-import java.util.function.Supplier;
-
 import glm.vec._3.Vec3;
 import glm.vec._4.Vec4;
 import ru.windcorp.progressia.client.Client;
 import ru.windcorp.progressia.client.ClientState;
 import ru.windcorp.progressia.client.graphics.Colors;
+import ru.windcorp.progressia.client.graphics.backend.GraphicsBackend;
 import ru.windcorp.progressia.client.graphics.backend.GraphicsInterface;
 import ru.windcorp.progressia.client.graphics.font.Font;
 import ru.windcorp.progressia.client.graphics.gui.DynamicLabel;
@@ -44,6 +40,11 @@ import ru.windcorp.progressia.common.util.dynstr.DynamicStrings;
 import ru.windcorp.progressia.server.Server;
 import ru.windcorp.progressia.server.ServerState;
 
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Objects;
+import java.util.function.Supplier;
+
 public class LayerTestGUI extends GUILayer {
 
 	public LayerTestGUI() {
@@ -110,6 +111,14 @@ public class LayerTestGUI extends GUILayer {
 			)
 		);
 
+		panel.addChild(
+			new Label(
+				"FullscreenDisplay",
+				font,
+				tmp_dynFormat("LayerTestGUI.IsFullscreen", GraphicsBackend::isFullscreen)
+			)
+		);
+
 		panel.addChild(
 			new DynamicLabel(
 				"FPSDisplay",
diff --git a/src/main/java/ru/windcorp/progressia/test/TestPlayerControls.java b/src/main/java/ru/windcorp/progressia/test/TestPlayerControls.java
index 710cbc1..9183130 100644
--- a/src/main/java/ru/windcorp/progressia/test/TestPlayerControls.java
+++ b/src/main/java/ru/windcorp/progressia/test/TestPlayerControls.java
@@ -187,6 +187,13 @@ public class TestPlayerControls {
 			handleEscape();
 			break;
 
+		case GLFW.GLFW_KEY_F11:
+			if (!event.isPress())
+				return false;
+			GraphicsInterface.makeFullscreen(!GraphicsBackend.isFullscreen());
+			updateGUI();
+			break;
+
 		case GLFW.GLFW_KEY_F3:
 			if (!event.isPress())
 				return false;
diff --git a/src/main/resources/assets/languages/en-US.lang b/src/main/resources/assets/languages/en-US.lang
index a47e216..3524c66 100644
--- a/src/main/resources/assets/languages/en-US.lang
+++ b/src/main/resources/assets/languages/en-US.lang
@@ -19,4 +19,5 @@ LayerTestGUI.PosDisplay.NA.Client = Pos: client n/a
 LayerTestGUI.PosDisplay.NA.Entity = Pos: entity n/a
 LayerTestGUI.SelectedBlockDisplay = %s Block: %s
 LayerTestGUI.SelectedTileDisplay = %s Tile:  %s
-LayerTestGUI.PlacementModeHint = (Blocks %s Tiles: Ctrl + Mouse Wheel)
\ No newline at end of file
+LayerTestGUI.PlacementModeHint = (Blocks %s Tiles: Ctrl + Mouse Wheel)
+LayerTestGUI.IsFullscreen = Fullscreen:     %5s (F11)
\ No newline at end of file
diff --git a/src/main/resources/assets/languages/ru-RU.lang b/src/main/resources/assets/languages/ru-RU.lang
index 180b25a..4056ee1 100644
--- a/src/main/resources/assets/languages/ru-RU.lang
+++ b/src/main/resources/assets/languages/ru-RU.lang
@@ -19,4 +19,5 @@ LayerTestGUI.PosDisplay.NA.Client = Поз:   клиент н/д
 LayerTestGUI.PosDisplay.NA.Entity = Поз: сущность н/д
 LayerTestGUI.SelectedBlockDisplay = %s Блок:   %s
 LayerTestGUI.SelectedTileDisplay = %s Плитка: %s
-LayerTestGUI.PlacementModeHint = (Блок %s плитки: Ctrl + прокрутка)
\ No newline at end of file
+LayerTestGUI.PlacementModeHint = (Блок %s плитки: Ctrl + прокрутка)
+LayerTestGUI.IsFullscreen = Полный экран:   %5s (F11)
\ No newline at end of file