diff --git a/contextAPI.js b/contextAPI.js
index c1c21f0..920ed75 100644
--- a/contextAPI.js
+++ b/contextAPI.js
@@ -22,6 +22,7 @@ contextBridge.exposeInMainWorld("api", {
 	},
 	openFile       : filePath => ipcRenderer.send("WindowManager::openFile", filePath),
 	closeFile      : () => ipcRenderer.send("Ation::closeFile"),
+	saveFile       : async newContent => await ipcRenderer.invoke("Ation::saveFile", newContent),
 
 	clearCache : () => webFrame.clearCache(),
 	appVersion : async () => await ipcRenderer.invoke("Ation::appVersion"),
diff --git a/src/Ation.js b/src/Ation.js
index 738629b..5202b2f 100644
--- a/src/Ation.js
+++ b/src/Ation.js
@@ -37,7 +37,8 @@ class Ation {
 		this.mainMenu        = new MainMenu(this);
 
 		ipcMain.handle("Ation::appVersion", () => AppInfo.version);
-		ipcMain.on("Ation::closeFile", () => this.closeFile());
+		ipcMain.handle("Ation::saveFile", async (_, newContent) => this.saveFile(newContent));
+		ipcMain.on("Ation::closeFile",  () => this.closeFile());
 
 		app.on("open-file", (_, path) => {
 			this.fileToOpen = path;
@@ -67,6 +68,10 @@ class Ation {
 		});
 	}
 
+	async saveFile(newContent) {
+		return fs.writeFile(this.currentFile, newContent, { encoding : "utf-8" })
+	}
+
 	addRecentFile(filePath) {
 		if (this.recentFiles.includes(filePath)) {
 			const position = this.recentFiles.indexOf(filePath);
@@ -119,7 +124,7 @@ class Ation {
 					else
 						this.openFile(this.currentFile, true);
 				});
-				this.windowManager.mainWindow.send("Ation::openFile", [basePath, data]);
+				this.windowManager.mainWindow.send("Ation::openFile", [basePath, data, fileContents]);
 				this.addRecentFile(filePath);
 				Menu.getApplicationMenu().getMenuItemById("close-file").enabled = this.currentFile !== "";
 			} catch (error) {
diff --git a/src/ui/package-lock.json b/src/ui/package-lock.json
index bec3546..c0f5a70 100644
--- a/src/ui/package-lock.json
+++ b/src/ui/package-lock.json
@@ -8,6 +8,7 @@
       "name": "ui",
       "version": "0.1.0",
       "dependencies": {
+        "@monaco-editor/react": "^4.6.0",
         "@testing-library/jest-dom": "^5.16.5",
         "@testing-library/react": "^13.4.0",
         "@testing-library/user-event": "^13.5.0",
@@ -3025,6 +3026,30 @@
       "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.4.tgz",
       "integrity": "sha512-Hcv+nVC0kZnQ3tD9GVu5xSMR4VVYOteQIr/hwFPVEvPdlXqgGEuRjiheChHgdM+JyqdgNcmzZOX/tnl0JOiI7A=="
     },
+    "node_modules/@monaco-editor/loader": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/loader/-/loader-1.4.0.tgz",
+      "integrity": "sha512-00ioBig0x642hytVspPl7DbQyaSWRaolYie/UFNjoTdvoKPzo6xrXLhTk9ixgIKcLH5b5vDOjVNiGyY+uDCUlg==",
+      "dependencies": {
+        "state-local": "^1.0.6"
+      },
+      "peerDependencies": {
+        "monaco-editor": ">= 0.21.0 < 1"
+      }
+    },
+    "node_modules/@monaco-editor/react": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/react/-/react-4.6.0.tgz",
+      "integrity": "sha512-RFkU9/i7cN2bsq/iTkurMWOEErmYcY6JiQI3Jn+WeR/FGISH8JbHERjpS9oRuSOPvDMJI0Z8nJeKkbOs9sBYQw==",
+      "dependencies": {
+        "@monaco-editor/loader": "^1.4.0"
+      },
+      "peerDependencies": {
+        "monaco-editor": ">= 0.25.0 < 1",
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0",
+        "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0"
+      }
+    },
     "node_modules/@nicolo-ribaudo/eslint-scope-5-internals": {
       "version": "5.1.1-v1",
       "resolved": "https://registry.npmjs.org/@nicolo-ribaudo/eslint-scope-5-internals/-/eslint-scope-5-internals-5.1.1-v1.tgz",
@@ -12030,6 +12055,12 @@
         "mkdirp": "bin/cmd.js"
       }
     },
+    "node_modules/monaco-editor": {
+      "version": "0.45.0",
+      "resolved": "https://registry.npmjs.org/monaco-editor/-/monaco-editor-0.45.0.tgz",
+      "integrity": "sha512-mjv1G1ZzfEE3k9HZN0dQ2olMdwIfaeAAjFiwNprLfYNRSz7ctv9XuCT7gPtBGrMUeV1/iZzYKj17Khu1hxoHOA==",
+      "peer": true
+    },
     "node_modules/ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
@@ -15543,6 +15574,11 @@
       "resolved": "https://registry.npmjs.org/stackframe/-/stackframe-1.3.4.tgz",
       "integrity": "sha512-oeVtt7eWQS+Na6F//S4kJ2K2VbRlS9D43mAlMyVpVWovy9o+jfgH8O9agzANzaiLjclA0oYzUXEM4PurhSUChw=="
     },
+    "node_modules/state-local": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/state-local/-/state-local-1.0.7.tgz",
+      "integrity": "sha512-HTEHMNieakEnoe33shBYcZ7NX83ACUjCu8c40iOGEZsngj9zRnkqS9j1pqQPXwobB0ZcVTk27REb7COQ0UR59w=="
+    },
     "node_modules/statuses": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
@@ -19243,6 +19279,22 @@
       "resolved": "https://registry.npmjs.org/@leichtgewicht/ip-codec/-/ip-codec-2.0.4.tgz",
       "integrity": "sha512-Hcv+nVC0kZnQ3tD9GVu5xSMR4VVYOteQIr/hwFPVEvPdlXqgGEuRjiheChHgdM+JyqdgNcmzZOX/tnl0JOiI7A=="
     },
+    "@monaco-editor/loader": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/loader/-/loader-1.4.0.tgz",
+      "integrity": "sha512-00ioBig0x642hytVspPl7DbQyaSWRaolYie/UFNjoTdvoKPzo6xrXLhTk9ixgIKcLH5b5vDOjVNiGyY+uDCUlg==",
+      "requires": {
+        "state-local": "^1.0.6"
+      }
+    },
+    "@monaco-editor/react": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/@monaco-editor/react/-/react-4.6.0.tgz",
+      "integrity": "sha512-RFkU9/i7cN2bsq/iTkurMWOEErmYcY6JiQI3Jn+WeR/FGISH8JbHERjpS9oRuSOPvDMJI0Z8nJeKkbOs9sBYQw==",
+      "requires": {
+        "@monaco-editor/loader": "^1.4.0"
+      }
+    },
     "@nicolo-ribaudo/eslint-scope-5-internals": {
       "version": "5.1.1-v1",
       "resolved": "https://registry.npmjs.org/@nicolo-ribaudo/eslint-scope-5-internals/-/eslint-scope-5-internals-5.1.1-v1.tgz",
@@ -25797,6 +25849,12 @@
         "minimist": "^1.2.6"
       }
     },
+    "monaco-editor": {
+      "version": "0.45.0",
+      "resolved": "https://registry.npmjs.org/monaco-editor/-/monaco-editor-0.45.0.tgz",
+      "integrity": "sha512-mjv1G1ZzfEE3k9HZN0dQ2olMdwIfaeAAjFiwNprLfYNRSz7ctv9XuCT7gPtBGrMUeV1/iZzYKj17Khu1hxoHOA==",
+      "peer": true
+    },
     "ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
@@ -28180,6 +28238,11 @@
       "resolved": "https://registry.npmjs.org/stackframe/-/stackframe-1.3.4.tgz",
       "integrity": "sha512-oeVtt7eWQS+Na6F//S4kJ2K2VbRlS9D43mAlMyVpVWovy9o+jfgH8O9agzANzaiLjclA0oYzUXEM4PurhSUChw=="
     },
+    "state-local": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/state-local/-/state-local-1.0.7.tgz",
+      "integrity": "sha512-HTEHMNieakEnoe33shBYcZ7NX83ACUjCu8c40iOGEZsngj9zRnkqS9j1pqQPXwobB0ZcVTk27REb7COQ0UR59w=="
+    },
     "statuses": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
diff --git a/src/ui/package.json b/src/ui/package.json
index 99d532d..35a7b56 100644
--- a/src/ui/package.json
+++ b/src/ui/package.json
@@ -4,6 +4,7 @@
   "private": true,
   "homepage": "./",
   "dependencies": {
+    "@monaco-editor/react": "^4.6.0",
     "@testing-library/jest-dom": "^5.16.5",
     "@testing-library/react": "^13.4.0",
     "@testing-library/user-event": "^13.5.0",
diff --git a/src/ui/src/assets/css/_window.scss b/src/ui/src/assets/css/_window.scss
index ff53727..a5cbaa8 100644
--- a/src/ui/src/assets/css/_window.scss
+++ b/src/ui/src/assets/css/_window.scss
@@ -28,6 +28,15 @@
 				font-size: calc(3vw * 0.7);
 			}
 		}
+
+		&.edit {
+			display: grid;
+			grid-template-columns: 1fr 2fr;
+
+			& > .slide:first-child {
+				font-size: calc(3vw / 3 * 0.7);
+			}
+		}
 	}
 
 	&.fullscreen {
diff --git a/src/ui/src/components/Ation.js b/src/ui/src/components/Ation.js
index 1fa1cee..aa91ad8 100644
--- a/src/ui/src/components/Ation.js
+++ b/src/ui/src/components/Ation.js
@@ -8,6 +8,7 @@ import Blackout        from "./Blackout";
 import NoFile          from "./NoFile";
 import Toolbar         from "./Toolbar";
 import Tips            from "./Tips";
+import Editor          from "./Editor";
 
 import SlideContext    from "../shared/SlideContext";
 import SettingsContext from "../shared/SettingsContext";
@@ -21,15 +22,17 @@ const Ation = () => {
 	const [basePath, setBasePath]                        = useState("");
 	const [showTips, setShowTips]                        = useState(false);
 	const [version, setVersion]                          = useState("0.0.0");
+	const [source, setSource]                            = useState("");
 
 	useEffect(() => {
 		window.api.onFileOpen(presentation => {
 			window.api.clearCache();
-			const [newBasePath, slideDeck] = presentation;
+			const [newBasePath, slideDeck, fileContents] = presentation;
 			if (!slideDeck)
 				return;
 			if (slide >= slideDeck.length)
 				setSlide(0);
+			setSource(fileContents);
 			setMeta(slideDeck.metaData);
 			setBasePath(newBasePath);
 			setDeck(slideDeck.slides);
@@ -48,6 +51,13 @@ const Ation = () => {
 		window.api.openFileDialog();
 	}
 
+	const toggleEdit = () => {
+		if (mode === Mode.NORMAL)
+			setMode(Mode.EDIT);
+		else if (mode === Mode.EDIT)
+			setMode(Mode.NORMAL);
+	}
+
 	return (
 		<>
 			{deck.length < 1 ?
@@ -57,17 +67,18 @@ const Ation = () => {
 					<section className={`window${mode === Mode.PRESENT ? " fullscreen" : ""}`}>
 						<Toolbar openFile={openFile} setShowTips={setShowTips} version={version} />
 						<SlidesList deck={deck} meta={meta} font={font} />
-						<main className="main" style={{
+						<main className={`main ${mode === Mode.EDIT ? "edit" : ""}`} style={{
 							"--color-hightlight" : meta?.color_highlight || highlightColor,
 							"--color-slideBackground" : meta?.color_background || backgroundColor,
 							"--color-slideForeground" : meta?.color_text || color
 						}}>
 							<Slide data={deck[slide] || null} style={{fontFamily : meta?.font || font}}/>
+							<Editor show={mode === Mode.EDIT} source={source} toggleEdit={toggleEdit} />
 						</main>
 						<Tips show={showTips} />
 					</section>
 					<Blackout show={mode === Mode.BLACKOUT} />
-					<KeyboardControl mode={mode} setMode={setMode} deck={deck} openFile={openFile} setShowTips={setShowTips} />
+					<KeyboardControl mode={mode} setMode={setMode} deck={deck} openFile={openFile} setShowTips={setShowTips} toggleEdit={toggleEdit} />
 				</SlideContext.Provider>
 			)}
 		</>
diff --git a/src/ui/src/components/Editor.js b/src/ui/src/components/Editor.js
new file mode 100644
index 0000000..b6bded4
--- /dev/null
+++ b/src/ui/src/components/Editor.js
@@ -0,0 +1,53 @@
+import React, {useEffect, useContext, useRef} from "react";
+import Monaco from "@monaco-editor/react";
+
+import SlideContext from "../shared/SlideContext";
+import Mode         from "../models/Mode";
+
+const Editor = ({show, source}) => {
+	const editor = useRef();
+	const {mode} = useContext(SlideContext);
+
+	useEffect(() => {
+		const listener = event => {
+			if (!event.metaKey && !event.ctrlKey)
+				return;
+			if (mode !== Mode.EDIT || event.key !== "s")
+				return;
+
+			window.api.saveFile(editor.current?.getValue());
+		};
+
+		document.addEventListener("keydown", listener);
+
+		return () => {
+			document.removeEventListener("keydown", listener);
+		};
+	}, [mode]);
+
+	const editorMount = (instance, _) => {
+		editor.current = instance;
+	}
+
+	if (!show)
+		return <></>;
+
+	return (
+		<>
+			<Monaco	
+				defaultLanguage="markdown"
+				height="100%"
+				options={{
+					minimap : {
+						enabled : false
+					}
+				}}
+				onMount={editorMount}
+				keepCurrentModel={true}
+				defaultValue={source}
+				theme="vs-dark" />
+		</>
+	);
+};
+
+export default Editor;
\ No newline at end of file
diff --git a/src/ui/src/components/KeyboardControl.js b/src/ui/src/components/KeyboardControl.js
index 39a68b1..314a789 100644
--- a/src/ui/src/components/KeyboardControl.js
+++ b/src/ui/src/components/KeyboardControl.js
@@ -3,7 +3,7 @@ import {useContext, useEffect, version} from "react";
 import SlideContext from "../shared/SlideContext";
 import Mode         from "../models/Mode";
 
-const KeyboardControl = ({openFile, mode, setMode, deck, setShowTips}) => {
+const KeyboardControl = ({openFile, mode, setMode, deck, setShowTips, toggleEdit}) => {
 	const {slide, setSlide} = useContext(SlideContext);
 
 	useEffect(() => {
@@ -51,7 +51,7 @@ const KeyboardControl = ({openFile, mode, setMode, deck, setShowTips}) => {
 					setSlide(slide + 1);
 					break;
 				case "b": // PRESENTER
-					if (mode === Mode.NORMAL)
+					if (mode === Mode.NORMAL || mode === Mode.EDIT)
 						return;
 				 	setMode(mode === Mode.BLACKOUT ? Mode.PRESENT : Mode.BLACKOUT);
 					break;
@@ -65,6 +65,9 @@ const KeyboardControl = ({openFile, mode, setMode, deck, setShowTips}) => {
 					event.preventDefault();
 					setShowTips(true);
 					break;
+				case "e":
+					toggleEdit();
+					break;
 				default:
 					return;
 			}
diff --git a/src/ui/src/components/Tips.js b/src/ui/src/components/Tips.js
index 8760045..de9c84e 100644
--- a/src/ui/src/components/Tips.js
+++ b/src/ui/src/components/Tips.js
@@ -5,6 +5,8 @@ const Cheatsheet = Object.freeze([
 	["Stop presentation",  "ESC"],
 	["Open file",          "⌘+O"],
 	["Close file",         "⌘+W"],
+	["Save file",          "⌘+S"],
+	["Toggle editor",      "e"],
 	["Next slide",         "→, Page up"],
 	["Last slide",         "←, Page down"],
 	["Black screen out",   "B"],
diff --git a/src/ui/src/components/Toolbar.js b/src/ui/src/components/Toolbar.js
index ce9e2cc..2bf4a10 100644
--- a/src/ui/src/components/Toolbar.js
+++ b/src/ui/src/components/Toolbar.js
@@ -1,13 +1,13 @@
 import React, {useContext} from "react";
 
-import {Folder2Open, Cast, InfoCircle, XSquare} from "react-bootstrap-icons";
+import {Folder2Open, Cast, InfoCircle, XSquare, LayoutSplit} from "react-bootstrap-icons";
 
 import SlideContext from "../shared/SlideContext";
 import Mode         from "../models/Mode";
 
 import {ReactComponent as Logo} from "../assets/images/logo_ation.svg";
 
-const Toolbar = ({openFile, setShowTips, version}) => {
+const Toolbar = ({openFile, setShowTips, version, toggleEdit}) => {
 	const {setMode, setSlide, slideCount} = useContext(SlideContext);
 
 	const present = () => {
@@ -23,6 +23,7 @@ const Toolbar = ({openFile, setShowTips, version}) => {
 			<Logo />
 			<button onClick={() => window.api.closeFile()} title="Close file [⌘+W]" disabled={slideCount < 1}><XSquare /></button>
 			<button onClick={() => setShowTips(true)} title="Show tips [TAB]"><InfoCircle /></button>	
+			<button onClick={toggleEdit} title="Toggle editor [e]"><LayoutSplit /></button>	
 			<small>v{version}</small>
 		</nav>
 	);
diff --git a/src/ui/src/models/Mode.js b/src/ui/src/models/Mode.js
index 034f6e2..67b7593 100644
--- a/src/ui/src/models/Mode.js
+++ b/src/ui/src/models/Mode.js
@@ -1,7 +1,8 @@
 const Mode = Object.freeze({
 	NORMAL   : 1,
 	PRESENT  : 2,
-	BLACKOUT : 3
+	BLACKOUT : 3,
+	EDIT     : 4
 });
 
 export default Mode;
\ No newline at end of file