diff --git a/crates/topola-egui/src/actions.rs b/crates/topola-egui/src/actions.rs
index 2b46686..68dd0eb 100644
--- a/crates/topola-egui/src/actions.rs
+++ b/crates/topola-egui/src/actions.rs
@@ -174,6 +174,7 @@ pub struct ViewActions {
     pub show_topo_navmesh: Switch,
     pub show_bboxes: Switch,
     pub show_origin_destination: Switch,
+    pub show_primitive_indices: Switch,
     pub show_appearance_panel: Switch,
 }
 
@@ -206,6 +207,10 @@ impl ViewActions {
                 tr.text("tr-menu-view-show-origin-destination"),
             )
             .into_switch(),
+            show_primitive_indices: Action::new_keyless(
+                tr.text("tr-menu-view-show-primitive-indices"),
+            )
+            .into_switch(),
             show_appearance_panel: Action::new_keyless(tr.text("tr-menu-view-show-layer-manager"))
                 .into_switch(),
         }
@@ -242,6 +247,8 @@ impl ViewActions {
             self.show_bboxes.checkbox(ui, &mut menu_bar.show_bboxes);
             self.show_origin_destination
                 .checkbox(ui, &mut menu_bar.show_origin_destination);
+            self.show_primitive_indices
+                .checkbox(ui, &mut menu_bar.show_primitive_indices);
         });
 
         ui.separator();
diff --git a/crates/topola-egui/src/displayer.rs b/crates/topola-egui/src/displayer.rs
index d104df9..87cd9cc 100644
--- a/crates/topola-egui/src/displayer.rs
+++ b/crates/topola-egui/src/displayer.rs
@@ -19,7 +19,7 @@ use topola::{
         primitive::MakePrimitiveShape,
     },
     geometry::{shape::AccessShape, GenericNode},
-    graph::MakeRef,
+    graph::{GetIndex, MakeRef},
     interactor::{activity::ActivityStepper, interaction::InteractionStepper},
     layout::poly::MakePolygon,
     math::{self, Circle, RotationSense},
@@ -76,6 +76,10 @@ impl<'a> Displayer<'a> {
         }
 
         self.display_activity(menu_bar);
+
+        if menu_bar.show_primitive_indices {
+            self.display_primitive_indices();
+        }
     }
 
     fn display_layout(&mut self, ctx: &egui::Context) {
@@ -555,4 +559,24 @@ impl<'a> Displayer<'a> {
             }
         }
     }
+
+    fn display_primitive_indices(&mut self) {
+        let board = self.workspace.interactor.invoker().autorouter().board();
+
+        if let Some(active_layer) = self.workspace.appearance_panel.active_layer {
+            for primitive in board.layout().drawing().layer_primitive_nodes(active_layer) {
+                let pos = primitive
+                    .primitive_ref(board.layout().drawing())
+                    .shape()
+                    .center();
+
+                self.painter.paint_text(
+                    pos,
+                    egui::Align2::CENTER_CENTER,
+                    &format!("{}", primitive.index()),
+                    egui::Color32::from_rgb(200, 200, 200),
+                );
+            }
+        }
+    }
 }
diff --git a/crates/topola-egui/src/menu_bar.rs b/crates/topola-egui/src/menu_bar.rs
index b0727b0..f19d99e 100644
--- a/crates/topola-egui/src/menu_bar.rs
+++ b/crates/topola-egui/src/menu_bar.rs
@@ -37,6 +37,7 @@ pub struct MenuBar {
     pub show_topo_navmesh: bool,
     pub show_bboxes: bool,
     pub show_origin_destination: bool,
+    pub show_primitive_indices: bool,
     pub show_appearance_panel: bool,
     pub frame_timestep: f32,
 }
@@ -64,6 +65,7 @@ impl MenuBar {
             show_topo_navmesh: false,
             show_bboxes: false,
             show_origin_destination: false,
+            show_primitive_indices: false,
             show_appearance_panel: true,
             frame_timestep: 0.1,
         }
diff --git a/locales/en-US/main.ftl b/locales/en-US/main.ftl
index 321de37..2dc2c62 100644
--- a/locales/en-US/main.ftl
+++ b/locales/en-US/main.ftl
@@ -30,6 +30,7 @@ tr-menu-view-show-pathfinding-scores = Show Pathfinding Scores
 tr-menu-view-show-topo-navmesh = Show Topological Navmesh
 tr-menu-view-show-bboxes = Show BBoxes
 tr-menu-view-show-origin-destination = Show Origin–Destination
+tr-menu-view-show-primitive-indices = Show Primitive Indices
 tr-menu-view-show-layer-manager = Show Layer Manager
 tr-menu-view-kdb-scroll-delta-factor = Keyboard scroll delta factor
 tr-menu-view-frame-timestep = Frame Timestep