diff --git a/.github/workflows/size.yml b/.github/workflows/size.yml
new file mode 100644
index 0000000..7266718
--- /dev/null
+++ b/.github/workflows/size.yml
@@ -0,0 +1,17 @@
+  
+name: Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2-beta
+      with:
+        fetch-depth: 1
+    - uses: preactjs/compressed-size-action@v1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"