diff --git a/src/components/app.jsx b/src/components/app.jsx
index 968ae8f..77484a2 100644
--- a/src/components/app.jsx
+++ b/src/components/app.jsx
@@ -90,6 +90,7 @@ const version = '6.4.0';
 window.forcedSettings = {};
 window.codeHtml = '';
 window.codeCss = '';
+window.codeLayout = null;
 if (location.search) {
 	let match = location.search.replace(/^\?/, '').match(/settings=([^=]*)/);
 	if (match) {
@@ -105,6 +106,18 @@ if (location.search) {
 	const params = new URLSearchParams(location.search);
 	window.codeHtml = params.get('html') || '';
 	window.codeCss = params.get('css') || '';
+	window.codeLayout = (() => {
+		const layout = params.get('layout');
+		if (!layout) return null;
+		if (layout === 'full') {
+			return 5;
+		}
+		const _val = parseInt(layout, 10);
+		if (_val >= 1 && _val <= 5) {
+			return _val;
+		}
+		return null;
+	})();
 }
 
 function customRoute(path) {
@@ -291,6 +304,9 @@ export default class App extends Component {
 				code: ''
 			},
 			result => {
+				if (window.codeLayout) {
+					result.layoutMode = window.codeLayout;
+				}
 				this.toggleLayout(result.layoutMode);
 				this.state.prefs.layoutMode = result.layoutMode;
 				if (result.code) {
@@ -411,8 +427,11 @@ export default class App extends Component {
 	}
 
 	refreshEditor() {
+		// if window.codeLayout is set, use it, otherwise use the current item's layout mode
 		this.toggleLayout(
-			this.state.currentItem.layoutMode || this.state.prefs.layoutMode
+			window.codeLayout
+				? window.codeLayout
+				: this.state.currentItem.layoutMode || this.state.prefs.layoutMode
 		);
 		this.updateExternalLibCount();
 		this.contentWrap.refreshEditor();
diff --git a/tests/layout-parameter.test.js b/tests/layout-parameter.test.js
new file mode 100644
index 0000000..431a635
--- /dev/null
+++ b/tests/layout-parameter.test.js
@@ -0,0 +1,148 @@
+import { h, Component } from 'preact';
+
+// Mock the global objects and functions that are used in the app
+global.window = {
+	location: {
+		search: ''
+	},
+	localStorage: {
+		getItem: jest.fn(),
+		setItem: jest.fn()
+	},
+	user: null,
+	IS_EXTENSION: false
+};
+
+global.location = global.window.location;
+
+// Mock the database functions
+global.db = {
+	local: {
+		get: jest.fn(),
+		set: jest.fn()
+	},
+	getSettings: jest.fn(),
+	getUserLastSeenVersion: jest.fn(),
+	setUserLastSeenVersion: jest.fn()
+};
+
+// Mock other global functions
+global.log = jest.fn();
+global.trackEvent = jest.fn();
+global.alertsService = {
+	add: jest.fn()
+};
+
+describe('Layout Parameter Tests', () => {
+	beforeEach(() => {
+		// Reset all mocks before each test
+		jest.clearAllMocks();
+
+		// Reset global variables
+		global.window.forcedSettings = {};
+		global.window.codeHtml = '';
+		global.window.codeCss = '';
+		global.window.codeLayout = null;
+	});
+
+	test('should parse layout parameter from URL correctly', () => {
+		// Set up URL with layout parameter
+		global.window.location.search = '?layout=3&html=<div>test</div>';
+
+		// Simulate the URL parsing logic from app.jsx
+		if (global.window.location.search) {
+			const params = new URLSearchParams(global.window.location.search);
+			global.window.codeHtml = params.get('html') || '';
+			global.window.codeCss = params.get('css') || '';
+			global.window.codeLayout = params.get('layout')
+				? parseInt(params.get('layout'), 10)
+				: null;
+		}
+
+		expect(global.window.codeLayout).toBe(3);
+		expect(global.window.codeHtml).toBe('<div>test</div>');
+	});
+
+	test('should handle invalid layout parameter gracefully', () => {
+		// Set up URL with invalid layout parameter
+		global.window.location.search = '?layout=invalid&html=<div>test</div>';
+
+		// Simulate the URL parsing logic
+		if (global.window.location.search) {
+			const params = new URLSearchParams(global.window.location.search);
+			global.window.codeLayout = params.get('layout')
+				? parseInt(params.get('layout'), 10)
+				: null;
+		}
+
+		expect(global.window.codeLayout).toBe(NaN);
+	});
+
+	test('should handle layout parameter out of range', () => {
+		// Test layout values outside the valid range (1-5)
+		const testCases = [0, 6, 10, -1];
+
+		testCases.forEach(layoutValue => {
+			global.window.location.search = `?layout=${layoutValue}`;
+
+			if (global.window.location.search) {
+				const params = new URLSearchParams(global.window.location.search);
+				global.window.codeLayout = params.get('layout')
+					? parseInt(params.get('layout'), 10)
+					: null;
+			}
+
+			// The layout should be parsed but may be outside valid range
+			expect(global.window.codeLayout).toBe(layoutValue);
+		});
+	});
+
+	test('should handle multiple query parameters correctly', () => {
+		// Set up URL with multiple parameters
+		global.window.location.search =
+			'?layout=2&html=<div>test</div>&css=body{color:red}&settings=autoPreview:true';
+
+		// Simulate the URL parsing logic
+		if (global.window.location.search) {
+			let match = global.window.location.search
+				.replace(/^\?/, '')
+				.match(/settings=([^=]*)/);
+			if (match) {
+				match = match[1];
+				match.split(',').map(pair => {
+					pair = pair.split(':');
+					if (pair[1] === 'true') pair[1] = true;
+					else if (pair[1] === 'false') pair[1] = false;
+					global.window.forcedSettings[pair[0]] = pair[1];
+				});
+			}
+
+			const params = new URLSearchParams(global.window.location.search);
+			global.window.codeHtml = params.get('html') || '';
+			global.window.codeCss = params.get('css') || '';
+			global.window.codeLayout = params.get('layout')
+				? parseInt(params.get('layout'), 10)
+				: null;
+		}
+
+		expect(global.window.codeLayout).toBe(2);
+		expect(global.window.codeHtml).toBe('<div>test</div>');
+		expect(global.window.codeCss).toBe('body{color:red}');
+		expect(global.window.forcedSettings.autoPreview).toBe(true);
+	});
+
+	test('should handle empty search string', () => {
+		// Set up URL with no parameters
+		global.window.location.search = '';
+
+		// Simulate the URL parsing logic
+		if (global.window.location.search) {
+			const params = new URLSearchParams(global.window.location.search);
+			global.window.codeLayout = params.get('layout')
+				? parseInt(params.get('layout'), 10)
+				: null;
+		}
+
+		expect(global.window.codeLayout).toBe(null);
+	});
+});