diff --git a/.github/workflows/size.yml b/.github/workflows/size.yml
new file mode 100644
index 0000000..c71853b
--- /dev/null
+++ b/.github/workflows/size.yml
@@ -0,0 +1,39 @@
+name: Size
+
+on:
+  pull_request:
+    branches:
+      - master
+permissions:
+  pull-requests: write
+jobs:
+  size-plaintext:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v1
+      - uses: andresz1/size-limit-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          directory: demos/playground
+  size-richtext:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v1
+      - uses: andresz1/size-limit-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          directory: demos/richtext-editor
+  size-playground:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v1
+      - uses: andresz1/size-limit-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          directory: demos/playground