diff --git a/src/constants.ts b/src/constants.ts
index 1aac189..75e63ea 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -13,6 +13,9 @@ export const CONSTANTS = {
 export const IPC_COMMANDS = {
   TOGGLE_INFO: 'TOGGLE_INFO',
   SHOW_DISK_IMAGE: 'SHOW_DISK_IMAGE',
+  ZOOM_IN: 'ZOOM_IN',
+  ZOOM_OUT: 'ZOOM_OUT',
+  ZOOM_RESET: 'ZOOM_RESET',
   // Machine instructions
   MACHINE_START: 'MACHINE_START',
   MACHINE_RESTART: 'MACHINE_RESTART',
diff --git a/src/main/main.ts b/src/main/main.ts
index 409de82..da79325 100644
--- a/src/main/main.ts
+++ b/src/main/main.ts
@@ -4,7 +4,7 @@ import { isDevMode } from "../utils/devmode";
 import { setupAboutPanel } from "./about-panel";
 import { shouldQuit } from "./squirrel";
 import { setupUpdates } from "./update";
-import { createWindow } from "./windows";
+import { getOrCreateWindow } from "./windows";
 import { setupMenu } from "./menu";
 
 /**
@@ -14,7 +14,7 @@ import { setupMenu } from "./menu";
 export async function onReady() {
   if (!isDevMode()) process.env.NODE_ENV = "production";
 
-  createWindow();
+  getOrCreateWindow();
   setupAboutPanel();
   setupMenu();
   setupUpdates();
diff --git a/src/main/menu.ts b/src/main/menu.ts
index be7a1f4..ca86c62 100644
--- a/src/main/menu.ts
+++ b/src/main/menu.ts
@@ -1,8 +1,9 @@
-import { app, shell, Menu, BrowserWindow, ipcMain } from "electron";
+import { app, shell, Menu, BrowserWindow, ipcMain, webFrame } from "electron";
 
 import { clearCaches } from "../cache";
 import { IPC_COMMANDS } from "../constants";
 import { isDevMode } from "../utils/devmode";
+import { getOrCreateWindow } from "./windows";
 
 const LINKS = {
   homepage: "https://www.twitter.com/felixrieseberg",
@@ -100,6 +101,24 @@ async function createMenu({ isRunning } = { isRunning: false }) {
           label: "Close",
           accelerator: "CmdOrCtrl+W",
           role: "close"
+        },
+        {
+          type: "separator"
+        },
+        {
+          label: "Zoom in",
+          click: () => send(IPC_COMMANDS.ZOOM_IN),
+          enabled: isRunning
+        },
+        {
+          label: "Zoom out",
+          click: () => send(IPC_COMMANDS.ZOOM_OUT),
+          enabled: isRunning
+        },
+        {
+          label: "Reset zoom",
+          click: () => send(IPC_COMMANDS.ZOOM_RESET),
+          enabled: isRunning
         }
       ]
     },
diff --git a/src/main/windows.ts b/src/main/windows.ts
index 81f7ea5..641a5e7 100644
--- a/src/main/windows.ts
+++ b/src/main/windows.ts
@@ -1,8 +1,10 @@
 import { BrowserWindow } from "electron";
 
-let mainWindow;
+let mainWindow: BrowserWindow | null = null;
+
+export function getOrCreateWindow(): BrowserWindow {
+  if (mainWindow) return mainWindow;
 
-export function createWindow() {
   // Create the browser window.
   mainWindow = new BrowserWindow({
     width: 1024,
@@ -18,4 +20,6 @@ export function createWindow() {
   mainWindow.on("closed", () => {
     mainWindow = null;
   });
+
+  return mainWindow;
 }
diff --git a/src/renderer/emulator.tsx b/src/renderer/emulator.tsx
index 779a250..d33c6b6 100644
--- a/src/renderer/emulator.tsx
+++ b/src/renderer/emulator.tsx
@@ -1,7 +1,7 @@
 import * as React from "react";
 import * as fs from "fs-extra";
 import * as path from "path";
-import { ipcRenderer, remote, shell } from "electron";
+import { ipcRenderer, remote, shell, webFrame } from "electron";
 
 import { CONSTANTS, IPC_COMMANDS } from "../constants";
 import { getDiskImageSize } from "../utils/disk-image-size";
@@ -14,6 +14,7 @@ import { EmulatorInfo } from "./emulator-info";
 export interface EmulatorState {
   currentUiCard: string;
   emulator?: any;
+  scale: number;
   floppyFile?: string;
   isBootingFresh: boolean;
   isCursorCaptured: boolean;
@@ -38,7 +39,8 @@ export class Emulator extends React.Component<{}, EmulatorState> {
       isCursorCaptured: false,
       isRunning: false,
       currentUiCard: "start",
-      isInfoDisplayed: true
+      isInfoDisplayed: true,
+      scale: 1
     };
 
     this.setupInputListeners();
@@ -123,11 +125,11 @@ export class Emulator extends React.Component<{}, EmulatorState> {
       if (this.state.emulator && this.state.isRunning) {
         this.state.emulator.keyboard_send_scancodes([
           0x38, // alt
-          0x3E, // f4
+          0x3e, // f4
 
           // break codes
           0x38 | 0x80,
-          0x3E | 0x80
+          0x3e | 0x80
         ]);
       }
     });
@@ -157,6 +159,14 @@ export class Emulator extends React.Component<{}, EmulatorState> {
     ipcRenderer.on(IPC_COMMANDS.SHOW_DISK_IMAGE, () => {
       this.showDiskImage();
     });
+
+    ipcRenderer.on(IPC_COMMANDS.ZOOM_IN, () => {
+      this.setScale(this.state.scale * 1.2);
+    });
+
+    ipcRenderer.on(IPC_COMMANDS.ZOOM_OUT, () => {
+      this.setScale(this.state.scale * 0.8);
+    });
   }
 
   /**
@@ -428,4 +438,18 @@ export class Emulator extends React.Component<{}, EmulatorState> {
       );
     }
   }
+
+  /**
+   * Set the emulator's scale
+   *
+   * @param target
+   */
+  private setScale(target: number) {
+    const { emulator, isRunning } = this.state;
+
+    if (emulator && isRunning) {
+      emulator.screen_set_scale(target);
+      this.setState({ scale: target });
+    }
+  }
 }