diff --git a/options/custom/desktops/niri/default.nix b/options/custom/desktops/niri/default.nix
index 33bc5be..d608200 100644
--- a/options/custom/desktops/niri/default.nix
+++ b/options/custom/desktops/niri/default.nix
@@ -35,8 +35,13 @@ in {
         };
       };
 
-      # Enable rootless Xwayland
-      services.xwayland-satellite.enable = cfg.xwayland;
+      services = {
+        # Enable rootless Xwayland
+        xwayland-satellite.enable = cfg.xwayland;
+
+        # Enable X11/Wayland clipboard sync
+        clipsync.enable = true;
+      };
     };
 
     # https://github.com/YaLTeR/niri
diff --git a/options/custom/services/clipnotify.nix b/options/custom/services/clipnotify.nix
new file mode 100644
index 0000000..56b1aef
--- /dev/null
+++ b/options/custom/services/clipnotify.nix
@@ -0,0 +1,43 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.custom.services.clipsync;
+
+  clipnotify = getExe pkgs.clipnotify;
+  wl-copy = getExe' pkgs.wl-clipboard "wl-copy";
+  xclip = getExe pkgs.xclip;
+in {
+  options.custom.services.clipsync = {
+    enable = mkOption {default = false;};
+  };
+
+  config = mkIf cfg.enable {
+    # https://github.com/cdown/clipnotify
+    systemd.user.services.clipsync = {
+      enable = true;
+      wantedBy = ["graphical-session.target"];
+
+      unitConfig = {
+        Description = "Sync clipboard between Wayland and X11";
+
+        After =
+          ["graphical-session.target"]
+          ++ optionals config.custom.services.xwayland-satellite.enable ["xwayland-satellite.service"];
+      };
+
+      serviceConfig = {
+        Type = "simple";
+
+        ExecStart = pkgs.writeShellScript "clipsync" ''
+          while ${clipnotify}; do
+            ${xclip} -selection clipboard -out | ${wl-copy}
+          done
+        '';
+      };
+    };
+  };
+}