diff --git a/routes/offline.py b/routes/offline.py
index ff25922..51326f7 100644
--- a/routes/offline.py
+++ b/routes/offline.py
@@ -9,13 +9,14 @@ import os
 offline_bp = Blueprint('offline', __name__, url_prefix='/offline')
 
 # Default offline settings
-OFFLINE_DEFAULTS = {
-    'offline.enabled': False,
-    'offline.assets_source': 'cdn',
-    'offline.fonts_source': 'cdn',
-    'offline.tile_provider': 'cartodb_dark_cyan',
-    'offline.tile_server_url': ''
-}
+OFFLINE_DEFAULTS = {
+    'offline.enabled': False,
+    # Default to bundled assets/fonts to avoid third-party CDN privacy blocks.
+    'offline.assets_source': 'local',
+    'offline.fonts_source': 'local',
+    'offline.tile_provider': 'cartodb_dark_cyan',
+    'offline.tile_server_url': ''
+}
 
 # Asset paths to check
 ASSET_PATHS = {
diff --git a/static/js/core/settings-manager.js b/static/js/core/settings-manager.js
index f6983fc..cbbabf7 100644
--- a/static/js/core/settings-manager.js
+++ b/static/js/core/settings-manager.js
@@ -6,8 +6,8 @@ const Settings = {
     // Default settings
     defaults: {
         'offline.enabled': false,
-        'offline.assets_source': 'cdn',
-        'offline.fonts_source': 'cdn',
+        'offline.assets_source': 'local',
+        'offline.fonts_source': 'local',
         'offline.tile_provider': 'cartodb_dark_cyan',
         'offline.tile_server_url': ''
     },