diff --git a/api/routes.py b/api/routes.py
index 2aaac2bf..31d28286 100644
--- a/api/routes.py
+++ b/api/routes.py
@@ -1928,6 +1928,15 @@ _LOGIN_LOCALE = {
         "invalid_pw": "Invalid password",
         "conn_failed": "Connection failed",
     },
+    "fr": {
+        "lang": "fr-FR",
+        "title": "Se connecter",
+        "subtitle": "Entrez votre mot de passe pour continuer",
+        "placeholder": "Mot de passe",
+        "btn": "Se connecter",
+        "invalid_pw": "Mot de passe invalide",
+        "conn_failed": "\u00c9chec de la connexion",
+    },
     "es": {
         "lang": "es-ES",
         "title": "Iniciar sesi\u00f3n",
diff --git a/tests/test_issue1488_composer_voice_buttons.py b/tests/test_issue1488_composer_voice_buttons.py
index 787bf8a8..f1e1a78e 100644
--- a/tests/test_issue1488_composer_voice_buttons.py
+++ b/tests/test_issue1488_composer_voice_buttons.py
@@ -123,7 +123,7 @@ class TestComposerVoiceButtonI18n:
         "voice_mode_toggle_active",
     )
 
-    LOCALES = ("en", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
+    LOCALES = ("en", "fr", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
 
     def test_legacy_voice_toggle_key_removed(self):
         """The old key whose string was 'Voice input' caused the duplicate-
@@ -171,7 +171,7 @@ class TestComposerVoiceButtonI18n:
 class TestVoiceModePreferenceGate:
     """boot.js must hide btnVoiceMode by default, surface it via Preferences."""
 
-    LOCALES = ("en", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
+    LOCALES = ("en", "fr", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
 
     def test_voice_mode_pref_is_localstorage_backed(self):
         """The pref reads from localStorage key 'hermes-voice-mode-button'."""
diff --git a/tests/test_login_locale_parity.py b/tests/test_login_locale_parity.py
index 77392f96..313e2632 100644
--- a/tests/test_login_locale_parity.py
+++ b/tests/test_login_locale_parity.py
@@ -293,8 +293,10 @@ def test_login_locale_resolver_handles_new_locales():
     assert _resolve_login_locale_key("pt-PT") == "pt"
     assert _resolve_login_locale_key("ko") == "ko"
     assert _resolve_login_locale_key("ko-KR") == "ko"
+    assert _resolve_login_locale_key("fr") == "fr"
+    assert _resolve_login_locale_key("fr-FR") == "fr"
+    assert _resolve_login_locale_key("fr-CA") == "fr"
     # Unknown locale still falls back to en.
-    assert _resolve_login_locale_key("fr") == "en"
     assert _resolve_login_locale_key("xx-YY") == "en"