diff --git a/frontend/src/i18n/setup.ts b/frontend/src/i18n/setup.ts
index dc3a6074..93e620e4 100644
--- a/frontend/src/i18n/setup.ts
+++ b/frontend/src/i18n/setup.ts
@@ -44,9 +44,18 @@ Object.entries(localeFiles).forEach(([path, module]) => {
 })
 
 const getStoredLanguage = (): string => {
+	let stored: string | null = null
 	try {
-		const stored = localStorage.getItem('altsendme-language')
-		return stored || 'en'
+		stored = localStorage.getItem('altsendme-language')
+	} catch {
+		// Continue with browser-locale detection when storage is unavailable.
+	}
+
+	try {
+		const tag = (navigator.language || 'en').toLowerCase()
+		const keys = Object.keys(resources)
+		const pick = (t: string) => keys.find((k) => k.toLowerCase().startsWith(t))
+		return stored || pick(tag) || pick(tag.slice(0, 2)) || 'en'
 	} catch {
 		return 'en'
 	}