diff --git a/build.ts b/build.ts
index 240734b..02652c6 100644
--- a/build.ts
+++ b/build.ts
@@ -10,6 +10,7 @@ const entrypoints = [
 	"./src/lower-case.ts",
 	"./src/snake-case.ts",
 	"./src/start-case.ts",
+	"./src/to-upper.ts",
 ];
 
 async function build() {
diff --git a/package.json b/package.json
index 919e308..e4622ae 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,11 @@
         "name": "Convert clipboard text to Start Case",
         "main": "dist/start-case.js",
         "cmds": []
+      },
+      {
+        "name": "Convert clipboard text to UPPER CASE",
+        "main": "dist/to-upper.js",
+        "cmds": []
       }
     ]
   },
diff --git a/src/to-upper.ts b/src/to-upper.ts
new file mode 100644
index 0000000..44f81f8
--- /dev/null
+++ b/src/to-upper.ts
@@ -0,0 +1,11 @@
+import { expose } from "@kksh/api/headless";
+import toUpper from "lodash/toUpper";
+import { BaseExt } from "./base";
+
+class ToUpperExt extends BaseExt {
+    constructor() {
+        super(toUpper);
+    }
+}
+
+expose(new ToUpperExt()); 
\ No newline at end of file