diff --git a/src/lib/components/wizard/StepColumnMap.svelte b/src/lib/components/wizard/StepColumnMap.svelte
index 6a4b325..f73188c 100644
--- a/src/lib/components/wizard/StepColumnMap.svelte
+++ b/src/lib/components/wizard/StepColumnMap.svelte
@@ -1,5 +1,11 @@
 <script lang="ts">
-	import { selectedSheet, currentStep, columnMapping } from '$lib/stores';
+	import {
+		selectedSheet,
+		currentStep,
+		columnMapping,
+	} from '$lib/stores';
+	import { userEmail } from '$lib/google';
+	import { hashString } from '$lib/utils';
 	import type { ColumnMappingType, SheetInfoType } from '$lib/stores';
 	import { getSheetNames, getSheetData, ensureToken } from '$lib/google';
 	import { onMount } from 'svelte';
@@ -33,7 +39,13 @@
 		{ key: 'alreadyPrinted', label: 'Already Printed', required: false }
 	];
 
-	const RECENT_SHEETS_KEY = 'recentSheets';
+	async function getRecentSheetsKey() {
+		const email = $userEmail;
+		if (email) {
+			return `recentSheets_${await hashString(email)}`;
+		}
+		return 'recentSheets_anonymous';
+	}
 
 	// Load available sheets when component mounts
 	onMount(async () => {
@@ -42,7 +54,8 @@
 			console.log('Selected sheet on mount:', $selectedSheet);
 
 			// Check if we already have saved mapping data
-			const recentSheetsData = localStorage.getItem(RECENT_SHEETS_KEY);
+			const key = await getRecentSheetsKey();
+			const recentSheetsData = localStorage.getItem(key);
 
 			if (recentSheetsData) {
 				try {
@@ -161,7 +174,7 @@
 				autoMapColumns();
 
 				// Check if we have saved column mapping for this sheet
-				loadSavedColumnMapping();
+				await loadSavedColumnMapping();
 			} else {
 				error = 'The selected sheet appears to be empty.';
 				console.warn('Sheet is empty');
@@ -235,14 +248,15 @@
 		updateMappingStatus();
 	}
 
-	function loadSavedColumnMapping() {
+	async function loadSavedColumnMapping() {
 		if (!$selectedSheet || !selectedSheetName) {
 			console.log('Cannot load saved column mapping: missing selectedSheet or selectedSheetName');
 			return;
 		}
 
 		try {
-			const existingData = localStorage.getItem(RECENT_SHEETS_KEY);
+			const key = await getRecentSheetsKey();
+			const existingData = localStorage.getItem(key);
 
 			if (existingData) {
 				const recentSheets = JSON.parse(existingData);
@@ -256,7 +270,7 @@
 					// Override auto-mapping with saved mapping
 					mappedIndices = {
 						name: savedSheet.columnMapping.name ?? -1,
-						nationality: savedSheet.columnMappin.nationality ?? -1,
+						nationality: savedSheet.columnMapping.nationality ?? -1,
 						birthday: savedSheet.columnMapping.birthday ?? -1,
 						pictureUrl: savedSheet.columnMapping.pictureUrl ?? -1,
 						alreadyPrinted: savedSheet.columnMapping.alreadyPrinted ?? -1,
@@ -318,12 +332,13 @@
 		});
 	}
 
-	function handleContinue() {
+	async function handleContinue() {
 		if (!mappingComplete || !$selectedSheet || !selectedSheetName) return;
 
 		// Save column mapping to localStorage for the selected sheet
 		try {
-			const existingData = localStorage.getItem(RECENT_SHEETS_KEY);
+			const key = await getRecentSheetsKey();
+			const existingData = localStorage.getItem(key);
 			let recentSheets = existingData ? JSON.parse(existingData) : [];
 
 			// Find the current sheet in recent sheets and update its column mapping
@@ -344,9 +359,6 @@
 				// Update existing entry
 				recentSheets[sheetIndex].columnMapping = columnMappingData;
 				recentSheets[sheetIndex].lastUsed = new Date().toISOString();
-
-				// Ensure we have consistent property names
-				recentSheets[sheetIndex].id = recentSheets[sheetIndex].id || recentSheets[sheetIndex].id;
 			} else {
 				// Add new entry
 				const newEntry = {
@@ -364,7 +376,7 @@
 				}
 			}
 
-			localStorage.setItem(RECENT_SHEETS_KEY, JSON.stringify(recentSheets));
+			localStorage.setItem(key, JSON.stringify(recentSheets));
 		} catch (err) {
 			console.error('Failed to save column mapping to localStorage:', err);
 		}
diff --git a/src/lib/components/wizard/StepSheetSearch.svelte b/src/lib/components/wizard/StepSheetSearch.svelte
index badc088..4289577 100644
--- a/src/lib/components/wizard/StepSheetSearch.svelte
+++ b/src/lib/components/wizard/StepSheetSearch.svelte
@@ -1,7 +1,8 @@
 <script lang="ts">
 	import { selectedSheet, currentStep } from '$lib/stores';
 	import type { SheetInfoType } from '$lib/stores';
-	import { searchSheets, ensureToken } from '$lib/google';
+	import { searchSheets, ensureToken, userEmail } from '$lib/google';
+	import { hashString } from '$lib/utils';
 	import { onMount } from 'svelte';
 	import Navigator from './subcomponents/Navigator.svelte';
 
@@ -12,7 +13,13 @@
 	let hasSearched = $state(false);
 	let recentSheets = $state<any[]>([]);
 
-	const RECENT_SHEETS_KEY = 'recentSheets';
+	async function getRecentSheetsKey() {
+		const email = $userEmail;
+		if (email) {
+			return `recentSheets_${await hashString(email)}`;
+		}
+		return 'recentSheets_anonymous';
+	}
 
 	onMount(() => {
 		ensureToken();
@@ -37,16 +44,18 @@
 		}
 	}
 
-	function loadRecentSheets() {
+	async function loadRecentSheets() {
 		try {
-			const saved = localStorage.getItem(RECENT_SHEETS_KEY);
+			const key = await getRecentSheetsKey();
+			const saved = localStorage.getItem(key);
 			if (saved) {
 				recentSheets = JSON.parse(saved);
 			}
 		} catch (err) {
 			console.error('Error loading recent sheets:', err);
 			// If there's an error, clear the stored value
-			localStorage.removeItem(RECENT_SHEETS_KEY);
+			const key = await getRecentSheetsKey();
+			localStorage.removeItem(key);
 			recentSheets = [];
 		}
 	}
diff --git a/src/lib/google.ts b/src/lib/google.ts
index 313547a..fa649a9 100644
--- a/src/lib/google.ts
+++ b/src/lib/google.ts
@@ -5,6 +5,7 @@ import { env } from '$env/dynamic/public';
 export const accessToken = writable<string | null | undefined>(undefined);
 export const isSignedIn = writable(false);
 export const isGoogleApiReady = writable(false); // To track GAPI client readiness
+export const userEmail = writable<string | null>(null);
 
 let tokenClient: google.accounts.oauth2.TokenClient;
 let gapiInited = false;
@@ -48,6 +49,27 @@ export function initGoogleClients(callback: () => void) {
 	}
 }
 
+/**
+ * Fetches user's email and stores it.
+ */
+async function fetchUserInfo(token: string) {
+	try {
+		const response = await fetch('https://www.googleapis.com/oauth2/v3/userinfo', {
+			headers: {
+				Authorization: `Bearer ${token}`
+			}
+		});
+		if (!response.ok) {
+			throw new Error('Failed to fetch user info');
+		}
+		const profile = await response.json();
+		userEmail.set(profile.email);
+	} catch (error) {
+		console.error('Error fetching user info:', error);
+		userEmail.set(null);
+	}
+}
+
 // 2. Load GSI script for Auth. This should only be called after GAPI is ready.
 function initGsiClient(callback: () => void) {
 	if (gsiInited) {
@@ -64,7 +86,7 @@ function initGsiClient(callback: () => void) {
 		tokenClient = google.accounts.oauth2.initTokenClient({
 			client_id: env.PUBLIC_GOOGLE_CLIENT_ID,
 			scope:
-				'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets.readonly',
+				'https://www.googleapis.com/auth/drive.readonly https://www.googleapis.com/auth/spreadsheets.readonly https://www.googleapis.com/auth/userinfo.email',
 			callback: (tokenResponse) => {
 				// This callback handles responses from all token requests.
 				if (tokenResponse.error) {
@@ -78,6 +100,7 @@ function initGsiClient(callback: () => void) {
 					isSignedIn.set(true);
 					// Also set the token for the GAPI client
 					if (gapiInited) gapi.client.setToken({ access_token: token });
+					fetchUserInfo(token);
 				}
 			}
 		});
@@ -152,6 +175,7 @@ export function handleSignOut() {
 	}
 	accessToken.set(null);
 	isSignedIn.set(false);
+	userEmail.set(null);
 
 	console.log('User signed out.');
 }
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
new file mode 100644
index 0000000..9e9cacc
--- /dev/null
+++ b/src/lib/utils.ts
@@ -0,0 +1,13 @@
+/**
+ * Hashes a string using the SHA-256 algorithm.
+ * @param input The string to hash.
+ * @returns A promise that resolves to the hex-encoded hash string.
+ */
+export async function hashString(input: string): Promise<string> {
+	const encoder = new TextEncoder();
+	const data = encoder.encode(input);
+	const hashBuffer = await crypto.subtle.digest('SHA-256', data);
+	const hashArray = Array.from(new Uint8Array(hashBuffer));
+	const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
+	return hashHex;
+}