diff --git a/misc/web/index.html b/misc/web/index.html
index c209fb2..2b0d741 100644
--- a/misc/web/index.html
+++ b/misc/web/index.html
@@ -48,6 +48,25 @@
   }
 </script>
 
+<script>
+  function isAndroid() {
+    return /Android/i.test(navigator.userAgent || '');
+  }
+
+  function lockLandscapeOnAndroid() {
+    if (!isAndroid()) return;
+
+    var orientation = screen.orientation;
+    if (!orientation || typeof orientation.lock !== 'function') return;
+
+    orientation.lock('landscape').catch(function () {});
+  }
+
+  lockLandscapeOnAndroid();
+  window.addEventListener('pointerdown', lockLandscapeOnAndroid, { once: true });
+  window.addEventListener('touchstart', lockLandscapeOnAndroid, { once: true, passive: true });
+</script>
+
 <script>
   var Module = {
     canvas: document.getElementById('canvas'),
diff --git a/misc/web/manifest.json b/misc/web/manifest.json
index f8547db..6320485 100644
--- a/misc/web/manifest.json
+++ b/misc/web/manifest.json
@@ -7,6 +7,7 @@
   "scope": "./",
   "display_override": ["standalone"],
   "display": "standalone",
+  "orientation": "landscape",
   "background_color": "#000000",
   "theme_color": "#000000",
   "icons": [