diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
new file mode 100644
index 0000000..f4f5dc8
--- /dev/null
+++ b/.github/workflows/validate.yml
@@ -0,0 +1,26 @@
+name: Validate
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Check index.html exists and is non-empty
+        run: test -s index.html
+
+      - name: HTML syntax validation
+        uses: Cyb3r-Jak3/html5validator-action@v7.2.0
+        with:
+          root: .
+          format: text