diff --git a/.github/workflows/compressed-size.yml b/.github/workflows/compressed-size.yml
new file mode 100644
index 0000000..23e4d5c
--- /dev/null
+++ b/.github/workflows/compressed-size.yml
@@ -0,0 +1,16 @@
+name: Compressed Size
+
+on: [pull_request_target]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: refs/pull/${{ github.event.pull_request.number }}/merge
+    - uses: preactjs/compressed-size-action@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        pattern: "./dist/*.{js}"
+        build-script: "package"