diff --git a/lib/model/settings/modules/debug.dart b/lib/model/settings/modules/debug.dart
new file mode 100644
index 000000000..f7402068d
--- /dev/null
+++ b/lib/model/settings/modules/debug.dart
@@ -0,0 +1,7 @@
+import 'package:aves_model/aves_model.dart';
+
+mixin DebugSettings on SettingsAccess {
+  bool get debugShowViewerTiles => getBool(SettingKeys.debugShowViewerTilesKey) ?? false;
+
+  set debugShowViewerTiles(bool newValue) => set(SettingKeys.debugShowViewerTilesKey, newValue);
+}
diff --git a/lib/model/settings/settings.dart b/lib/model/settings/settings.dart
index af1b205e0..f4d181fd1 100644
--- a/lib/model/settings/settings.dart
+++ b/lib/model/settings/settings.dart
@@ -12,6 +12,7 @@ import 'package:aves/model/settings/enums/accessibility_animations.dart';
 import 'package:aves/model/settings/enums/map_style.dart';
 import 'package:aves/model/settings/modules/app.dart';
 import 'package:aves/model/settings/modules/collection.dart';
+import 'package:aves/model/settings/modules/debug.dart';
 import 'package:aves/model/settings/modules/display.dart';
 import 'package:aves/model/settings/modules/filter_grids.dart';
 import 'package:aves/model/settings/modules/info.dart';
@@ -40,7 +41,7 @@ import 'package:latlong2/latlong.dart';
 
 final Settings settings = Settings._private();
 
-class Settings with ChangeNotifier, SettingsAccess, AppSettings, DisplaySettings, NavigationSettings, SearchSettings, CollectionSettings, FilterGridsSettings, PrivacySettings, ViewerSettings, VideoSettings, SubtitlesSettings, InfoSettings {
+class Settings with ChangeNotifier, SettingsAccess, DebugSettings, AppSettings, DisplaySettings, NavigationSettings, SearchSettings, CollectionSettings, FilterGridsSettings, PrivacySettings, ViewerSettings, VideoSettings, SubtitlesSettings, InfoSettings {
   final List<StreamSubscription> _subscriptions = [];
   final EventChannel _platformSettingsChangeChannel = const OptionalEventChannel('deckers.thibault/aves/settings_change');
   final StreamController<SettingsChangedEvent> _updateStreamController = StreamController.broadcast();
diff --git a/lib/widgets/debug/general.dart b/lib/widgets/debug/general.dart
index 704dd6be5..985dc20f3 100644
--- a/lib/widgets/debug/general.dart
+++ b/lib/widgets/debug/general.dart
@@ -1,7 +1,9 @@
+import 'package:aves/model/settings/settings.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:aves/services/analysis_service.dart';
 import 'package:aves/widgets/common/identity/aves_expansion_tile.dart';
 import 'package:aves/widgets/debug/overlay.dart';
+import 'package:aves/widgets/settings/common/tiles.dart';
 import 'package:aves/widgets/viewer/info/common.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
@@ -61,6 +63,11 @@ class _DebugGeneralSectionState extends State<DebugGeneralSection> with Automati
           },
           title: const Text('Show tasks overlay'),
         ),
+        SettingsSwitchListTile(
+          selector: (context, s) => s.debugShowViewerTiles,
+          onChanged: (v) => settings.debugShowViewerTiles = v,
+          title: 'Show viewer tiles',
+        ),
         ElevatedButton(
           onPressed: () => LeakTracking.collectLeaks().then((leaks) {
             const config = LeakDiagnosticConfig(
diff --git a/lib/widgets/viewer/visual/raster.dart b/lib/widgets/viewer/visual/raster.dart
index 3ca4148eb..8d0396be1 100644
--- a/lib/widgets/viewer/visual/raster.dart
+++ b/lib/widgets/viewer/visual/raster.dart
@@ -429,6 +429,28 @@ class _RegionTileState extends State<_RegionTile> {
       );
     }
 
+    if (settings.debugShowViewerTiles) {
+      final regionRect = widget.regionRect;
+      child = Stack(
+        children: [
+          Positioned.fill(child: child),
+          Text(
+            '\ntile=(${tileRect.left.round()}, ${tileRect.top.round()}) ${tileRect.width.round()} x ${tileRect.height.round()}'
+            '\nregion=(${regionRect.left.round()}, ${regionRect.top.round()}) ${regionRect.width.round()} x ${regionRect.height.round()}'
+            '\nsampleSize=${widget.sampleSize}',
+            style: const TextStyle(backgroundColor: Colors.black87),
+          ),
+          Positioned.fill(
+            child: DecoratedBox(
+              decoration: BoxDecoration(
+                border: Border.all(color: Colors.red, width: 1),
+              ),
+            ),
+          ),
+        ],
+      );
+    }
+
     return Positioned.fromRect(
       rect: tileRect,
       child: child,
diff --git a/plugins/aves_model/lib/src/settings/keys.dart b/plugins/aves_model/lib/src/settings/keys.dart
index c1ed5ecd6..19cec2c3c 100644
--- a/plugins/aves_model/lib/src/settings/keys.dart
+++ b/plugins/aves_model/lib/src/settings/keys.dart
@@ -10,6 +10,7 @@ class SettingKeys {
     topEntryIdsKey,
     recentDestinationAlbumsKey,
     recentTagsKey,
+    debugShowViewerTilesKey,
   };
 
   static const _widgetKeyPrefix = 'widget_';
@@ -29,6 +30,9 @@ class SettingKeys {
   static const recentDestinationAlbumsKey = 'recent_destination_albums';
   static const recentTagsKey = 'recent_tags';
 
+  // debug
+  static const debugShowViewerTilesKey = 'debug_show_viewer_tiles';
+
   // display
   static const displayRefreshRateModeKey = 'display_refresh_rate_mode';
   static const themeBrightnessKey = 'theme_brightness';