diff --git a/Userland/Applications/PDFViewer/PDFViewer.cpp b/Userland/Applications/PDFViewer/PDFViewer.cpp
index 72abb439d82..253db28c8b7 100644
--- a/Userland/Applications/PDFViewer/PDFViewer.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewer.cpp
@@ -48,6 +48,7 @@ PDFViewer::PDFViewer()
     m_page_view_mode = static_cast<PageViewMode>(Config::read_i32("PDFViewer"sv, "Display"sv, "PageMode"sv, 0));
     m_rendering_preferences.show_clipping_paths = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ShowClippingPaths"sv, false);
     m_rendering_preferences.show_images = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ShowImages"sv, true);
+    m_rendering_preferences.show_diagnostics = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ShowDiagnostics"sv, false);
     m_rendering_preferences.clip_images = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ClipImages"sv, true);
     m_rendering_preferences.clip_paths = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ClipPaths"sv, true);
     m_rendering_preferences.clip_text = Config::read_bool("PDFViewer"sv, "Rendering"sv, "ClipText"sv, true);
@@ -170,6 +171,13 @@ void PDFViewer::set_current_page(u32 current_page)
     update();
 }
 
+void PDFViewer::set_show_rendering_diagnostics(bool show_diagnostics)
+{
+    m_rendering_preferences.show_diagnostics = show_diagnostics;
+    Config::write_bool("PDFViewer"sv, "Rendering"sv, "ShowDiagnostics"sv, show_diagnostics);
+    update();
+}
+
 void PDFViewer::set_show_clipping_paths(bool show_clipping_paths)
 {
     m_rendering_preferences.show_clipping_paths = show_clipping_paths;
diff --git a/Userland/Applications/PDFViewer/PDFViewer.h b/Userland/Applications/PDFViewer/PDFViewer.h
index 0459713593a..6434d4382f8 100644
--- a/Userland/Applications/PDFViewer/PDFViewer.h
+++ b/Userland/Applications/PDFViewer/PDFViewer.h
@@ -62,6 +62,8 @@ public:
 
     PageViewMode page_view_mode() const { return m_page_view_mode; }
     void set_page_view_mode(PageViewMode);
+    bool show_rendering_diagnostics() const { return m_rendering_preferences.show_diagnostics; }
+    void set_show_rendering_diagnostics(bool);
     bool show_clipping_paths() const { return m_rendering_preferences.show_clipping_paths; }
     void set_show_clipping_paths(bool);
     bool show_images() const { return m_rendering_preferences.show_images; }
diff --git a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
index 9b914e61b1d..0f6086a4207 100644
--- a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
@@ -182,10 +182,10 @@ PDFViewerWidget::PDFViewerWidget()
         m_viewer->set_current_page(page);
     };
 
-    auto& v_splitter = h_splitter.add<GUI::VerticalSplitter>();
-    v_splitter.layout()->set_spacing(4);
+    m_vertical_splitter = h_splitter.add<GUI::VerticalSplitter>();
+    m_vertical_splitter->layout()->set_spacing(4);
 
-    m_viewer = v_splitter.add<PDFViewer>();
+    m_viewer = m_vertical_splitter->add<PDFViewer>();
     m_viewer->on_page_change = [&](auto new_page) {
         m_page_text_box->set_value(new_page + 1, GUI::AllowCallback::No);
         m_go_to_prev_page_action->set_enabled(new_page > 0);
@@ -195,7 +195,7 @@ PDFViewerWidget::PDFViewerWidget()
         verify_cast<PagedErrorsModel>(m_paged_errors_model.ptr())->add_errors(page, errors);
     };
 
-    m_errors_tree_view = v_splitter.add<GUI::TreeView>();
+    m_errors_tree_view = GUI::TreeView::construct();
     m_errors_tree_view->set_preferred_height(10);
     m_errors_tree_view->column_header().set_visible(true);
     m_errors_tree_view->set_should_fill_selected_rows(true);
@@ -203,6 +203,10 @@ PDFViewerWidget::PDFViewerWidget()
     m_errors_tree_view->set_model(MUST(GUI::SortingProxyModel::create(m_paged_errors_model)));
     m_errors_tree_view->set_key_column(0);
 
+    if (m_viewer->show_rendering_diagnostics()) {
+        m_vertical_splitter->add_child(*m_errors_tree_view);
+    }
+
     initialize_toolbar(toolbar);
 }
 
@@ -247,6 +251,16 @@ ErrorOr<void> PDFViewerWidget::initialize_menubar(GUI::Window& window)
     }));
 
     auto debug_menu = window.add_menu("&Debug"_string);
+    auto toggle_show_diagnostics = GUI::Action::create_checkable("Show Rendering &Diagnostics", [&](auto& action) {
+        if (action.is_checked()) {
+            m_vertical_splitter->add_child(*m_errors_tree_view);
+        } else {
+            m_vertical_splitter->remove_child(*m_errors_tree_view);
+        }
+        m_viewer->set_show_rendering_diagnostics(action.is_checked());
+    });
+    toggle_show_diagnostics->set_checked(m_viewer->show_rendering_diagnostics());
+    debug_menu->add_action(toggle_show_diagnostics);
     auto toggle_show_clipping_paths = GUI::Action::create_checkable("Show &Clipping Paths", [&](auto& action) {
         m_viewer->set_show_clipping_paths(action.is_checked());
     });
diff --git a/Userland/Applications/PDFViewer/PDFViewerWidget.h b/Userland/Applications/PDFViewer/PDFViewerWidget.h
index 70fafaa7001..9260117b797 100644
--- a/Userland/Applications/PDFViewer/PDFViewerWidget.h
+++ b/Userland/Applications/PDFViewer/PDFViewerWidget.h
@@ -14,6 +14,7 @@
 #include <LibGUI/ActionGroup.h>
 #include <LibGUI/CheckBox.h>
 #include <LibGUI/NumericInput.h>
+#include <LibGUI/Splitter.h>
 #include <LibGUI/Widget.h>
 
 class PDFViewer;
@@ -39,6 +40,7 @@ private:
     RefPtr<PDFViewer> m_viewer;
     RefPtr<SidebarWidget> m_sidebar;
     NonnullRefPtr<PagedErrorsModel> m_paged_errors_model;
+    RefPtr<GUI::VerticalSplitter> m_vertical_splitter;
     RefPtr<GUI::TreeView> m_errors_tree_view;
     RefPtr<GUI::NumericInput> m_page_text_box;
     RefPtr<GUI::Label> m_total_page_label;
diff --git a/Userland/Libraries/LibPDF/Renderer.h b/Userland/Libraries/LibPDF/Renderer.h
index bb45d00ae78..23f66a68797 100644
--- a/Userland/Libraries/LibPDF/Renderer.h
+++ b/Userland/Libraries/LibPDF/Renderer.h
@@ -89,6 +89,7 @@ struct GraphicsState {
 struct RenderingPreferences {
     bool show_clipping_paths { false };
     bool show_images { true };
+    bool show_diagnostics { false };
 
     bool clip_images { true };
     bool clip_paths { true };