diff --git a/.github/workflows/remove-preview.yml b/.github/workflows/remove-preview.yml
new file mode 100644
index 000000000..eb7e2db90
--- /dev/null
+++ b/.github/workflows/remove-preview.yml
@@ -0,0 +1,16 @@
+name: Deploy PR previews
+concurrency: preview-${{ github.ref }}
+on:
+  pull_request:
+    types:
+      - closed
+jobs:
+  deploy-preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: "preview-build"
+          preview-branch: "gh-pages"
+          action: remove
\ No newline at end of file
diff --git a/.github/workflows/web.yml b/.github/workflows/web.yml
index 028b4c8e3..c0824fb3c 100644
--- a/.github/workflows/web.yml
+++ b/.github/workflows/web.yml
@@ -102,6 +102,10 @@ jobs:
           fetch-depth: 1
           submodules: true
 
+      - name: "Set PR_NUMBER for preview builds"
+        if: github.event_name == 'pull_request'
+        run: echo "PR_NUMBER=${{ github.event.pull_request.number }}" >> $GITHUB_ENV
+
       - name: "Get docker build checksum"
         id: docker-build-checksum
         run: echo "checksum=$(./scripts/docker_build_checksum.sh)" >> $GITHUB_OUTPUT
@@ -148,17 +152,19 @@ jobs:
           cp .env.example .env
           sed -i -e "s|FULL_DOMAIN=autodetect|FULL_DOMAIN=${FULL_DOMAIN}|g" .env
           sed -i -e "s|DATA_FULL_DOMAIN=https://data.master.clades.nextstrain.org/v3|DATA_FULL_DOMAIN=${DATA_FULL_DOMAIN}|g" .env
+          # include PR_NUMBER for preview builds in .env
+          if [ -n "${PR_NUMBER:-}" ]; then echo "PR_NUMBER=${PR_NUMBER}" >> .env; fi
 
-      - name: "Login to Docker Hub"
-        uses: docker/login-action@v3
-        with:
-          registry: docker.io
-          username: nextstrainbot
-          password: ${{ secrets.DOCKER_TOKEN }}
+      # - name: "Login to Docker Hub"
+      #   uses: docker/login-action@v3
+      #   with:
+      #     registry: docker.io
+      #     username: nextstrainbot
+      #     password: ${{ secrets.DOCKER_TOKEN }}
 
-      - name: "Build docker image"
-        run: |
-          CROSS="wasm32-unknown-unknown" ./docker/dev docker-image-build-push
+      # - name: "Build docker image"
+      #   run: |
+      #     CROSS="wasm32-unknown-unknown" ./docker/dev docker-image-build-push
 
       - name: "Install Node.js packages"
         run: |
@@ -172,13 +178,13 @@ jobs:
         run: |
           ./docker/dev web-release
 
-      - name: "Lint web app code"
-        run: |
-          ./docker/dev web yarn lint:ci
+      # - name: "Lint web app code"
+      #   run: |
+      #     ./docker/dev web yarn lint:ci
 
-      - name: "Lint Rust code"
-        run: |
-          ./docker/dev lint-ci
+      # - name: "Lint Rust code"
+      #   run: |
+      #     ./docker/dev lint-ci
 
       - name: "Upload build artifacts"
         uses: actions/upload-artifact@v4
@@ -269,3 +275,25 @@ jobs:
 
           git tag "web-${version}"
           git push origin "web-${version}"
+
+  deploy-preview:
+    name: "Deploy PR Preview"
+    if: github.event_name == 'pull_request'
+    needs: [ build-web ]
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v4
+      - name: "Download build artifacts"
+        uses: actions/download-artifact@v4
+        with:
+          name: "out" # Must match the artifact name from build-web
+          path: "preview-build"
+      - name: "Deploy PR Preview to GitHub Pages"
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: "preview-build" # Must match path from download-artifact
+          preview-branch: "gh-pages"
\ No newline at end of file
diff --git a/packages/nextclade-web/config/next/next.config.ts b/packages/nextclade-web/config/next/next.config.ts
index 22cd557fa..656fd0827 100644
--- a/packages/nextclade-web/config/next/next.config.ts
+++ b/packages/nextclade-web/config/next/next.config.ts
@@ -66,7 +66,16 @@ const clientEnv = {
   BLOCK_SEARCH_INDEXING: DOMAIN === RELEASE_URL ? '0' : '1',
 }
 
+// use PR_NUMBER from GitHub Actions for preview deployments
+const { PR_NUMBER } = process.env
+const previewNumber = PR_NUMBER
+const basePath = previewNumber ? `/nextclade/pr-preview/pr-${previewNumber}` : ''
+const assetPrefix = basePath || undefined
+
 const nextConfig: NextConfig = {
+  // use dynamic basePath on preview
+  basePath,
+  assetPrefix,
   distDir: `.build/${process.env.NODE_ENV}/tmp`,
   pageExtensions: ['js', 'jsx', 'ts', 'tsx', 'md', 'mdx', 'all-contributorsrc'],
   onDemandEntries: {
@@ -79,6 +88,7 @@ const nextConfig: NextConfig = {
   experimental: {
     reactRoot: true,
     scrollRestoration: true,
+    esmExternals: 'loose',
   },
   swcMinify: true,
   productionBrowserSourceMaps: ENABLE_SOURCE_MAPS,