diff --git a/booru_viewer/gui/app.py b/booru_viewer/gui/app.py
index 52c6432..80e5e16 100644
--- a/booru_viewer/gui/app.py
+++ b/booru_viewer/gui/app.py
@@ -841,7 +841,8 @@ class BooruApp(QMainWindow):
         # Pause the main preview's video player
         self._preview._video_player.stop()
         from .preview import FullscreenPreview
-        self._fullscreen_window = FullscreenPreview(parent=self)
+        cols = self._grid._flow.columns
+        self._fullscreen_window = FullscreenPreview(grid_cols=cols, parent=self)
         self._fullscreen_window.navigate.connect(self._navigate_fullscreen)
         self._fullscreen_window.destroyed.connect(self._on_fullscreen_closed)
         self._fullscreen_window.set_media(path, self._preview._info_label.text())
diff --git a/booru_viewer/gui/preview.py b/booru_viewer/gui/preview.py
index d2377cd..ce94916 100644
--- a/booru_viewer/gui/preview.py
+++ b/booru_viewer/gui/preview.py
@@ -27,9 +27,10 @@ class FullscreenPreview(QMainWindow):
 
     navigate = Signal(int)  # -1 = prev, +1 = next
 
-    def __init__(self, parent=None) -> None:
+    def __init__(self, grid_cols: int = 3, parent=None) -> None:
         super().__init__(parent, Qt.WindowType.Window)
         self.setWindowTitle("booru-viewer — Fullscreen")
+        self._grid_cols = grid_cols
 
         self._stack = QStackedWidget()
         self.setCentralWidget(self._stack)
@@ -76,6 +77,12 @@ class FullscreenPreview(QMainWindow):
             elif key in (Qt.Key.Key_Right, Qt.Key.Key_L):
                 self.navigate.emit(1)
                 return True
+            elif key in (Qt.Key.Key_Up, Qt.Key.Key_K):
+                self.navigate.emit(-self._grid_cols)
+                return True
+            elif key in (Qt.Key.Key_Down, Qt.Key.Key_J):
+                self.navigate.emit(self._grid_cols)
+                return True
             elif key == Qt.Key.Key_Space and self._stack.currentIndex() == 1:
                 self._video._toggle_play()
                 return True