diff --git a/Cargo.lock b/Cargo.lock
index e176a9c1d..3e4d2dc54 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -905,7 +905,6 @@ dependencies = [
  "fj-interop",
  "fj-math",
  "fj-viewer",
- "fj-window",
  "thiserror 2.0.12",
  "tracing",
  "tracing-subscriber",
@@ -966,6 +965,7 @@ dependencies = [
  "bytemuck",
  "fj-interop",
  "fj-math",
+ "futures",
  "getrandom 0.2.15",
  "image",
  "nalgebra",
@@ -974,6 +974,7 @@ dependencies = [
  "tobj",
  "tracing",
  "wgpu",
+ "winit",
 ]
 
 [[package]]
diff --git a/crates/fj-viewer/Cargo.toml b/crates/fj-viewer/Cargo.toml
index dcb66e9cc..8ff208714 100644
--- a/crates/fj-viewer/Cargo.toml
+++ b/crates/fj-viewer/Cargo.toml
@@ -17,11 +17,13 @@ workspace = true
 [dependencies]
 fj-interop.workspace = true
 fj-math.workspace = true
+futures = "0.3.31"
 nalgebra = "0.33.2"
 tobj = "4.0.3"
 raw-window-handle = "0.6.0"
 thiserror = "2.0.12"
 tracing = "0.1.41"
+winit = "0.30.9"
 
 [dependencies.bytemuck]
 version = "1.22.0"
diff --git a/crates/fj-window/src/display.rs b/crates/fj-viewer/src/display.rs
similarity index 96%
rename from crates/fj-window/src/display.rs
rename to crates/fj-viewer/src/display.rs
index fb6f81118..eee3626b8 100644
--- a/crates/fj-window/src/display.rs
+++ b/crates/fj-viewer/src/display.rs
@@ -1,8 +1,4 @@
 use fj_interop::Model;
-use fj_viewer::{
-    DEFAULT_CAMERA_TUNING_CONFIG, InputEvent, RendererInitError, Screen,
-    ScreenSize, Viewer,
-};
 use futures::executor::block_on;
 use winit::{
     application::ApplicationHandler,
@@ -16,7 +12,11 @@ use winit::{
     window::WindowId,
 };
 
-use crate::window::{self, Window};
+use crate::{
+    DEFAULT_CAMERA_TUNING_CONFIG, InputEvent, RendererInitError, Screen,
+    ScreenSize, Viewer,
+    window::{self, Window},
+};
 
 /// Display the provided mesh in a window that processes input
 pub fn display(model: Model, invert_zoom: bool) -> Result<(), Error> {
@@ -122,8 +122,8 @@ impl ApplicationHandler for DisplayState {
             }
             WindowEvent::MouseInput { state, button, .. } => {
                 let button = match button {
-                    MouseButton::Left => Some(fj_viewer::MouseButton::Left),
-                    MouseButton::Right => Some(fj_viewer::MouseButton::Right),
+                    MouseButton::Left => Some(crate::MouseButton::Left),
+                    MouseButton::Right => Some(crate::MouseButton::Right),
                     _ => None,
                 };
 
diff --git a/crates/fj-viewer/src/lib.rs b/crates/fj-viewer/src/lib.rs
index bcbbe93bd..7330ff324 100644
--- a/crates/fj-viewer/src/lib.rs
+++ b/crates/fj-viewer/src/lib.rs
@@ -10,15 +10,19 @@
 
 mod assets;
 mod camera;
+mod display;
 mod graphics;
 mod input;
 mod screen;
 mod viewer;
+mod window;
 
 pub use self::{
+    display::{Error, display},
     graphics::{DeviceError, RendererInitError},
     input::InputEvent,
     input::{CameraTuningConfig, DEFAULT_CAMERA_TUNING_CONFIG, MouseButton},
     screen::{NormalizedScreenPosition, Screen, ScreenSize},
     viewer::Viewer,
+    window::WindowError,
 };
diff --git a/crates/fj-window/src/window.rs b/crates/fj-viewer/src/window.rs
similarity index 98%
rename from crates/fj-window/src/window.rs
rename to crates/fj-viewer/src/window.rs
index ba7986b4b..e92b71ef4 100644
--- a/crates/fj-window/src/window.rs
+++ b/crates/fj-viewer/src/window.rs
@@ -1,8 +1,9 @@
 use std::sync::Arc;
 
-use fj_viewer::{Screen, ScreenSize};
 use winit::event_loop::ActiveEventLoop;
 
+use crate::{Screen, ScreenSize};
+
 /// A window that can be used with `fj-viewer`
 pub struct Window {
     inner: Arc<winit::window::Window>,
diff --git a/crates/fj-window/src/lib.rs b/crates/fj-window/src/lib.rs
index 6461b0320..255ec8e60 100644
--- a/crates/fj-window/src/lib.rs
+++ b/crates/fj-window/src/lib.rs
@@ -4,14 +4,8 @@
 //! split into multiple libraries that can be used semi-independently, and this
 //! is one of those.
 //!
-//! This library provides a window abstraction based on Winit.
+//! This library has been deprecated. Its contents have moved into
+//! [`fj-viewer`].
 //!
 //! [Fornjot]: https://www.fornjot.app/
-
-mod display;
-mod window;
-
-pub use self::{
-    display::{Error, display},
-    window::WindowError,
-};
+//! [`fj-viewer`]: https://crates.io/crates/fj-viewer
diff --git a/crates/fj/Cargo.toml b/crates/fj/Cargo.toml
index cd31db614..17bc74b14 100644
--- a/crates/fj/Cargo.toml
+++ b/crates/fj/Cargo.toml
@@ -20,7 +20,6 @@ fj-export.workspace = true
 fj-interop.workspace = true
 fj-math.workspace = true
 fj-viewer.workspace = true
-fj-window.workspace = true
 thiserror = "2.0.12"
 tracing = "0.1.41"
 
diff --git a/crates/fj/src/instance.rs b/crates/fj/src/instance.rs
index 3107995f6..62e8306d2 100644
--- a/crates/fj/src/instance.rs
+++ b/crates/fj/src/instance.rs
@@ -90,7 +90,7 @@ impl Instance {
 
         let model = Model { mesh, aabb };
 
-        crate::window::display(model, false)?;
+        crate::viewer::display(model, false)?;
 
         Ok(())
     }
@@ -108,7 +108,7 @@ pub enum Error {
 
     /// Error displaying model
     #[error("Error displaying model")]
-    Display(#[from] crate::window::Error),
+    Display(#[from] crate::viewer::Error),
 
     /// Error exporting model
     #[error("Error exporting model")]
diff --git a/crates/fj/src/lib.rs b/crates/fj/src/lib.rs
index dc25e3fe4..2d35a7282 100644
--- a/crates/fj/src/lib.rs
+++ b/crates/fj/src/lib.rs
@@ -22,4 +22,3 @@ pub use fj_export as export;
 pub use fj_interop as interop;
 pub use fj_math as math;
 pub use fj_viewer as viewer;
-pub use fj_window as window;