diff --git a/.github/workflows/size-label.yml b/.github/workflows/size-label.yml
new file mode 100644
index 0000000..2ccbcc8
--- /dev/null
+++ b/.github/workflows/size-label.yml
@@ -0,0 +1,28 @@
+name: Label based on PR size
+
+on:
+  pull_request:
+  pull_request_target:
+  workflow_dispatch:
+
+jobs:
+  size-label:
+    permissions: write-all
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: size-label
+        if: >-
+          (
+            github.event_name == 'pull_request' &&
+            github.event.pull_request.head.repo.full_name == github.repository
+          ) || (
+            github.event_name == 'pull_request_target' &&
+            github.event.pull_request.head.repo.full_name != github.repository
+          ) || (
+            github.event_name == 'workflow_dispatch'
+          )
+        uses: "pascalgn/size-label-action@v0.5.5"
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"