diff --git a/.github/workflows/ci-manual.yml b/.github/workflows/ci-manual.yml
new file mode 100644
index 000000000..f9aea0e7d
--- /dev/null
+++ b/.github/workflows/ci-manual.yml
@@ -0,0 +1,38 @@
+name: On-demand multi-platform build
+
+on:
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: "Branch, tag, or commit SHA to build"
+        required: true
+        default: "master"
+      platform:
+        description: "Target platform"
+        required: true
+        type: choice
+        options:
+          - linux
+          - windows
+          - macos
+
+jobs:
+  build:
+    runs-on: ${{ inputs.platform == 'linux' && 'ubuntu-latest' || inputs.platform == 'windows' && 'windows-latest' || 'macos-latest' }}
+
+    steps:
+      - name: Checkout requested ref
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref }}
+
+      - name: Build libwaku
+        run: |
+          echo "Building ref=${{ inputs.ref }} for platform=${{ inputs.platform }}"
+          make libwaku
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: libwaku-${{ inputs.platform }}
+          path: build/libwaku.*