diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
new file mode 100644
index 000000000..25d12a976
--- /dev/null
+++ b/.github/workflows/clang-format.yml
@@ -0,0 +1,49 @@
+name: Check formatting
+
+on:
+  pull_request:
+    paths:
+      - '**'
+      - '!.gitignore'
+      - '!*.md'
+      - '!.github/**'
+      - '.github/workflows/clang-format.yml'
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+ 
+      - name: Fetch base commit
+        run: git fetch origin ${{ github.event.pull_request.base.sha }}
+ 
+      - name: Install clang-format-20
+        run: |
+          wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo tee /etc/apt/trusted.gpg.d/llvm.asc
+          echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-20 main" | sudo tee /etc/apt/sources.list.d/llvm-20.list
+          sudo apt-get update -qq
+          sudo apt-get install -y -qq clang-format-20
+ 
+      - uses: reviewdog/action-setup@v1
+ 
+      - name: Check formatting on changed lines
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git clang-format-20 --binary clang-format-20 \
+            --diff ${{ github.event.pull_request.base.sha }} -- \
+            '*.c' '*.cpp' '*.cc' '*.h' '*.hpp' \
+            | reviewdog \
+                -name="clang-format" \
+                -f=diff \
+                -reporter=github-pr-check \
+                -fail-level=error \
+                -filter-mode=added