diff --git a/src/update_db.py b/src/update_db.py
index a35e177bd7a7..bdf0917dd936 100644
--- a/src/update_db.py
+++ b/src/update_db.py
@@ -305,6 +305,10 @@ def _add_platform_game_counts(full_dict: dict) -> None:
     """
     Calculate and attach game counts to each platform, then rewrite platforms/all.json.
 
+    The ``games`` list (appended by :func:`_append_related_items`) is intentionally excluded from
+    the ``all.json`` summary file because it would make the file excessively large.  The full game
+    list is still available in each individual platform JSON file.
+
     Parameters
     ----------
     full_dict : dict
@@ -314,8 +318,14 @@ def _add_platform_game_counts(full_dict: dict) -> None:
     for platform_data in full_dict['platforms'].values():
         platform_data['game_count'] = len(platform_data.get('games', []))
 
+    # Write a lightweight all.json that omits the 'games' list so the file stays small enough
+    # to be hosted on GitHub Pages (< 100 MB limit).
+    summary_data = {
+        pid: {k: v for k, v in pdata.items() if k != 'games'}
+        for pid, pdata in full_dict['platforms'].items()
+    }
     file_path = os.path.join(args.out_dir, 'platforms', 'all')
-    write_json_files(file_path=file_path, data=full_dict['platforms'])
+    write_json_files(file_path=file_path, data=summary_data)
 
 
 def _build_buckets_and_collect_videos(full_dict: dict) -> tuple:
diff --git a/tests/unit/test_update_db.py b/tests/unit/test_update_db.py
index ee1b2b5f42e0..d4845d3cf7ab 100644
--- a/tests/unit/test_update_db.py
+++ b/tests/unit/test_update_db.py
@@ -271,6 +271,12 @@ def test_add_platform_game_counts(tmp_path):
     assert full_dict['platforms'][6]['game_count'] == 2
     assert full_dict['platforms'][48]['game_count'] == 0
     mock_write.assert_called_once()
+    # Verify the 'games' list is excluded from the summary written to all.json
+    written_data = mock_write.call_args.kwargs['data']
+    assert 'games' not in written_data[6]
+    assert 'games' not in written_data[48]
+    assert written_data[6]['game_count'] == 2
+    assert written_data[6]['name'] == 'PC'
 
 
 @pytest.mark.parametrize('name,expected_bucket', [