diff --git a/packages/web/src/index.ts b/packages/web/src/index.ts
index 7b0a924f..ebd162f8 100644
--- a/packages/web/src/index.ts
+++ b/packages/web/src/index.ts
@@ -297,6 +297,13 @@ export const SplunkRum: SplunkOtelWebType = {
 			},
 		)
 
+		if (['localStorage', 'cookie', undefined].includes(processedOptions.persistence)) {
+			diag.error(
+				'Invalid persistence flag: The value for "persistence" must be either "cookie", "localStorage", or omitted entirely.',
+			)
+			return
+		}
+
 		this._processedOptions = processedOptions
 
 		if (processedOptions.realm) {
@@ -359,7 +366,7 @@ export const SplunkRum: SplunkOtelWebType = {
 			eventTarget,
 			processedOptions.cookieDomain,
 			!!options._experimental_allSpansExtendSession,
-			processedOptions.useLocalStorage,
+			processedOptions.persistence === 'localStorage',
 		).deinit
 
 		const instrumentations = INSTRUMENTATIONS.map(({ Instrument, confKey, disable }) => {
@@ -522,7 +529,12 @@ export const SplunkRum: SplunkOtelWebType = {
 		}
 
 		if (this._processedOptions._experimental_allSpansExtendSession) {
-			updateSessionStatus({ forceStore: false, useLocalStorage: this._processedOptions.useLocalStorage ?? false })
+			updateSessionStatus({
+				forceStore: false,
+				useLocalStorage: this._processedOptions.persistence
+					? this._processedOptions.persistence === 'localStorage'
+					: false,
+			})
 		}
 	},
 }
diff --git a/packages/web/src/types/config.ts b/packages/web/src/types/config.ts
index d855be89..21215bb7 100644
--- a/packages/web/src/types/config.ts
+++ b/packages/web/src/types/config.ts
@@ -127,6 +127,18 @@ export interface SplunkOtelWebConfig {
 	/** Configuration for instrumentation modules. */
 	instrumentations?: SplunkOtelWebOptionsInstrumentations
 
+	/**
+	 * Specifies where session data should be stored.
+	 *
+	 * Available options:
+	 * - `'cookie'` (default): Session data will be stored in a browser cookie.
+	 *
+	 * - `'localStorage'`: Session data will be stored in the browser's localStorage.
+	 *
+	 * If not specified, `'cookie'` will be used as the default storage method.
+	 */
+	persistence?: 'cookie' | 'localStorage'
+
 	/**
 	 * The name of your organization’s realm. Automatically configures beaconUrl with correct URL
 	 */
@@ -150,9 +162,6 @@ export interface SplunkOtelWebConfig {
 	 */
 	tracer?: WebTracerConfig
 
-	/** Use local storage to save session ID instead of cookie */
-	useLocalStorage?: boolean
-
 	/**
 	 * Sets a value for the 'app.version' attribute
 	 */