diff --git a/.pipelines/v2/templates/stages-js.yml b/.pipelines/v2/templates/stages-js.yml
index 5fa3d1b2..7837e5cc 100644
--- a/.pipelines/v2/templates/stages-js.yml
+++ b/.pipelines/v2/templates/stages-js.yml
@@ -1,313 +1,475 @@
-# Build + test + pack stages for the sdk_v2 JS SDK.
+# Build + test + pack stages for the sdk_v2 JS SDK, parameterized by variant.
 #
-# Unlike Python and C#, the JS SDK ships a single multi-platform npm tarball.
-# Each per-platform build stage produces a `js-prebuild-<rid>` artifact
-# containing prebuilds/<plat>-<arch>/ (two .node addons + the matching
-# foundry_local shared library). The final `js_pack` stage downloads all
-# four prebuild artifacts, merges them under sdk_v2/js/prebuilds/, stamps
-# the version, and runs `npm pack` to produce a single .tgz.
+#   variant: base   -> foundry-local-sdk         (build win-x64 + win-arm64 + linux-x64 + osx-arm64;
+#                                                 test win-x64 + linux-x64 + osx-arm64)
+#   variant: winml  -> foundry-local-sdk-winml   (build + test win-x64; build-only win-arm64)
+#
+# Unlike Python and C#, the JS SDK ships a single multi-platform npm tarball
+# per variant. Each per-platform build stage produces a `js-prebuild-<rid>`
+# (base) or `js-prebuild-winml-<rid>` (winml) artifact containing
+# prebuilds/<plat>-<arch>/ (two .node addons + the matching foundry_local
+# shared library, and for the WinML variant the additional
+# Microsoft.Windows.AI.MachineLearning.dll). The final pack stage downloads
+# all prebuild artifacts for the variant, merges them under
+# sdk_v2/js/prebuilds/, stamps the version (and for WinML rewrites the
+# package name), and runs `npm pack` to produce a single .tgz.
 #
 # Build stages depend on:
 #   * compute_version          (sdkVersion.txt for the eventual pack stamp)
-#   * cpp_build_<rid>          (matching native foundry_local lib + import lib)
+#   * cpp_build_<rid>[_winml]  (matching native foundry_local lib + import lib;
+#                               WinML variant also brings the WinML EP DLL)
 #   * cpp_build_win_x64        (the cpp-native-include artifact, which is
-#                               stage-headers-only on the win-x64 build)
+#                               stage-headers-only on the base win-x64 build)
 #
 # Tests run on the same platform as the build, except win-arm64 (no
 # Windows-ARM64 pool; build-only, matching the C# + Python matrices).
 
+parameters:
+- name: variant
+  type: string
+  default: 'base'
+  values: ['base', 'winml']
+
 stages:
 
 # =====================================================================
-# Build stages
+# Base variant: build win-x64 + win-arm64 + linux-x64 + osx-arm64
 # =====================================================================
+- ${{ if eq(parameters.variant, 'base') }}:
 
-- stage: js_build_win_x64
-  displayName: 'JS SDK: Build Windows x64'
-  dependsOn:
-  - compute_version
-  - cpp_build_win_x64
-  jobs:
-  - job: build
-    pool:
-      name: onnxruntime-Win-CPU-2022
-      os: windows
-    variables:
-    - group: FoundryLocal-ESRP-Signing
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'version-info'
-        targetPath: '$(Pipeline.Workspace)/version-info'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-win-x64'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-win-x64'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-include'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-include'
-      outputs:
-      - output: pipelineArtifact
-        artifactName: 'js-prebuild-win-x64'
-        targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-    steps:
-    - checkout: self
-      clean: true
-    - template: steps-build-js.yml
-      parameters:
-        rid: 'win-x64'
-        nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-x64'
-        includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
-        outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-        signWindows: true
+  - stage: js_build_win_x64
+    displayName: 'JS SDK: Build Windows x64'
+    dependsOn:
+    - compute_version
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      variables:
+      - group: FoundryLocal-ESRP-Signing
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-win-x64'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-win-x64'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-win-x64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'win-x64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-x64'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+          signWindows: true
 
-- stage: js_build_win_arm64
-  displayName: 'JS SDK: Build Windows ARM64'
-  dependsOn:
-  - compute_version
-  - cpp_build_win_arm64
-  - cpp_build_win_x64
-  jobs:
-  - job: build
-    pool:
-      name: onnxruntime-Win-CPU-2022
-      os: windows
-    variables:
-    - group: FoundryLocal-ESRP-Signing
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'version-info'
-        targetPath: '$(Pipeline.Workspace)/version-info'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-win-arm64'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-win-arm64'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-include'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-include'
-      outputs:
-      - output: pipelineArtifact
-        artifactName: 'js-prebuild-win-arm64'
-        targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-    steps:
-    - checkout: self
-      clean: true
-    - template: steps-build-js.yml
-      parameters:
-        rid: 'win-arm64'
-        nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-arm64'
-        includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
-        outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-        targetArch: 'arm64'
-        signWindows: true
+  - stage: js_build_win_arm64
+    displayName: 'JS SDK: Build Windows ARM64'
+    dependsOn:
+    - compute_version
+    - cpp_build_win_arm64
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      variables:
+      - group: FoundryLocal-ESRP-Signing
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-win-arm64'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-win-arm64'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-win-arm64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'win-arm64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-arm64'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+          targetArch: 'arm64'
+          signWindows: true
 
-- stage: js_build_linux_x64
-  displayName: 'JS SDK: Build Linux x64'
-  dependsOn:
-  - compute_version
-  - cpp_build_linux_x64
-  - cpp_build_win_x64
-  jobs:
-  - job: build
-    pool:
-      name: onnxruntime-Ubuntu2404-AMD-CPU
-      os: linux
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'version-info'
-        targetPath: '$(Pipeline.Workspace)/version-info'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-linux-x64'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-linux-x64'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-include'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-include'
-      outputs:
-      - output: pipelineArtifact
-        artifactName: 'js-prebuild-linux-x64'
-        targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-    steps:
-    - checkout: self
-      clean: true
-    - template: steps-build-js.yml
-      parameters:
-        rid: 'linux-x64'
-        nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-linux-x64'
-        includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
-        outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+  - stage: js_build_linux_x64
+    displayName: 'JS SDK: Build Linux x64'
+    dependsOn:
+    - compute_version
+    - cpp_build_linux_x64
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: onnxruntime-Ubuntu2404-AMD-CPU
+        os: linux
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-linux-x64'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-linux-x64'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-linux-x64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'linux-x64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-linux-x64'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
 
-- stage: js_build_osx_arm64
-  displayName: 'JS SDK: Build macOS ARM64'
-  dependsOn:
-  - compute_version
-  - cpp_build_osx_arm64
-  - cpp_build_win_x64
-  jobs:
-  - job: build
-    pool:
-      name: AcesShared
-      os: macOS
-      demands:
-      - ImageOverride -equals ACES_VM_SharedPool_Sequoia
-    variables:
-    - group: FoundryLocal-ESRP-Signing
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'version-info'
-        targetPath: '$(Pipeline.Workspace)/version-info'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-osx-arm64'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-osx-arm64'
-      - input: pipelineArtifact
-        artifactName: 'cpp-native-include'
-        targetPath: '$(Pipeline.Workspace)/cpp-native-include'
-      outputs:
-      - output: pipelineArtifact
-        artifactName: 'js-prebuild-osx-arm64'
-        targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-    steps:
-    - checkout: self
-      clean: true
-    - template: steps-build-js.yml
-      parameters:
-        rid: 'osx-arm64'
-        nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-osx-arm64'
-        includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
-        outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
-        signMac: true
+  - stage: js_build_osx_arm64
+    displayName: 'JS SDK: Build macOS ARM64'
+    dependsOn:
+    - compute_version
+    - cpp_build_osx_arm64
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: AcesShared
+        os: macOS
+        demands:
+        - ImageOverride -equals ACES_VM_SharedPool_Sequoia
+      variables:
+      - group: FoundryLocal-ESRP-Signing
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-osx-arm64'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-osx-arm64'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-osx-arm64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'osx-arm64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-osx-arm64'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+          signMac: true
 
-# =====================================================================
-# Test stages — same-platform only. win-arm64 is build-only.
-# =====================================================================
+  # =====================================================================
+  # Tests — base variant. Same-platform only; win-arm64 is build-only.
+  # =====================================================================
+
+  - stage: js_test_win_x64
+    displayName: 'JS SDK: Test Windows x64'
+    dependsOn:
+    - js_build_win_x64
+    jobs:
+    - job: test
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-win-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-win-x64'
+      steps:
+      - checkout: self
+        clean: true
+      - template: ../../templates/checkout-steps.yml@self
+        parameters:
+          repoName: test-data-shared
+      - template: steps-test-js.yml
+        parameters:
+          rid: 'win-x64'
+          prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-win-x64'
+          testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
 
-- stage: js_test_win_x64
-  displayName: 'JS SDK: Test Windows x64'
-  dependsOn:
-  - js_build_win_x64
-  jobs:
-  - job: test
-    pool:
-      name: onnxruntime-Win-CPU-2022
-      os: windows
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-win-x64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-win-x64'
-    steps:
-    - checkout: self
-      clean: true
-    - template: ../../templates/checkout-steps.yml@self
-      parameters:
-        repoName: test-data-shared
-    - template: steps-test-js.yml
-      parameters:
-        rid: 'win-x64'
-        prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-win-x64'
-        testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
+  - stage: js_test_linux_x64
+    displayName: 'JS SDK: Test Linux x64'
+    dependsOn:
+    - js_build_linux_x64
+    jobs:
+    - job: test
+      pool:
+        name: onnxruntime-Ubuntu2404-AMD-CPU
+        os: linux
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-linux-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
+      steps:
+      - checkout: self
+        clean: true
+      - template: ../../templates/checkout-steps.yml@self
+        parameters:
+          repoName: test-data-shared
+      - template: steps-test-js.yml
+        parameters:
+          rid: 'linux-x64'
+          prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
+          testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
 
-- stage: js_test_linux_x64
-  displayName: 'JS SDK: Test Linux x64'
-  dependsOn:
-  - js_build_linux_x64
-  jobs:
-  - job: test
-    pool:
-      name: onnxruntime-Ubuntu2404-AMD-CPU
-      os: linux
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-linux-x64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
-    steps:
-    - checkout: self
-      clean: true
-    - template: ../../templates/checkout-steps.yml@self
-      parameters:
-        repoName: test-data-shared
-    - template: steps-test-js.yml
-      parameters:
-        rid: 'linux-x64'
-        prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
-        testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
+  - stage: js_test_osx_arm64
+    displayName: 'JS SDK: Test macOS ARM64'
+    dependsOn:
+    - js_build_osx_arm64
+    jobs:
+    - job: test
+      pool:
+        name: AcesShared
+        os: macOS
+        demands:
+        - ImageOverride -equals ACES_VM_SharedPool_Sequoia
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-osx-arm64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
+      steps:
+      - checkout: self
+        clean: true
+      - bash: |
+            set -euo pipefail
+            if ! command -v git-lfs >/dev/null 2>&1; then
+                brew install git-lfs
+            fi
+            git lfs install
+        displayName: 'Install git-lfs (macOS)'
+      - template: ../../templates/checkout-steps.yml@self
+        parameters:
+          repoName: test-data-shared
+      - template: steps-test-js.yml
+        parameters:
+          rid: 'osx-arm64'
+          prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
+          testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
 
-- stage: js_test_osx_arm64
-  displayName: 'JS SDK: Test macOS ARM64'
-  dependsOn:
-  - js_build_osx_arm64
-  jobs:
-  - job: test
-    pool:
-      name: AcesShared
-      os: macOS
-      demands:
-      - ImageOverride -equals ACES_VM_SharedPool_Sequoia
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-osx-arm64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
-    steps:
-    - checkout: self
-      clean: true
-    - bash: |
-          set -euo pipefail
-          if ! command -v git-lfs >/dev/null 2>&1; then
-              brew install git-lfs
-          fi
-          git lfs install
-      displayName: 'Install git-lfs (macOS)'
-    - template: ../../templates/checkout-steps.yml@self
-      parameters:
-        repoName: test-data-shared
-    - template: steps-test-js.yml
-      parameters:
-        rid: 'osx-arm64'
-        prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
-        testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
+  # =====================================================================
+  # Pack — base variant. Runs after all four builds. Pure packaging on
+  # Windows.
+  # =====================================================================
+
+  - stage: js_pack
+    displayName: 'JS SDK: Pack multi-platform npm tarball'
+    dependsOn:
+    - js_build_win_x64
+    - js_build_win_arm64
+    - js_build_linux_x64
+    - js_build_osx_arm64
+    jobs:
+    - job: pack
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-win-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-win-x64'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-win-arm64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-win-arm64'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-linux-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-osx-arm64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-sdk'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-sdk'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-pack-js.yml
+        parameters:
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-sdk'
 
 # =====================================================================
-# Pack stage — runs after all four builds. Pure packaging on Windows.
+# WinML variant: Windows only (x64 + arm64); only x64 is tested.
+# Produces the `foundry-local-sdk-winml` npm tarball.
 # =====================================================================
+- ${{ if eq(parameters.variant, 'winml') }}:
+
+  - stage: js_build_winml_win_x64
+    displayName: 'JS SDK: Build Windows x64 (WinML)'
+    dependsOn:
+    - compute_version
+    - cpp_build_win_x64_winml
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      variables:
+      - group: FoundryLocal-ESRP-Signing
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-win-x64-winml'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-win-x64-winml'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-winml-win-x64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'win-x64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-x64-winml'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+          isWinML: true
+          signWindows: true
+
+  - stage: js_build_winml_win_arm64
+    displayName: 'JS SDK: Build Windows ARM64 (WinML)'
+    dependsOn:
+    - compute_version
+    - cpp_build_win_arm64_winml
+    - cpp_build_win_x64
+    jobs:
+    - job: build
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      variables:
+      - group: FoundryLocal-ESRP-Signing
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-win-arm64-winml'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-win-arm64-winml'
+        - input: pipelineArtifact
+          artifactName: 'cpp-native-include'
+          targetPath: '$(Pipeline.Workspace)/cpp-native-include'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-prebuild-winml-win-arm64'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-build-js.yml
+        parameters:
+          rid: 'win-arm64'
+          nativeArtifactDir: '$(Pipeline.Workspace)/cpp-native-win-arm64-winml'
+          includeArtifactDir: '$(Pipeline.Workspace)/cpp-native-include'
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-prebuild'
+          targetArch: 'arm64'
+          isWinML: true
+          signWindows: true
+
+  - stage: js_test_winml_win_x64
+    displayName: 'JS SDK: Test Windows x64 (WinML)'
+    dependsOn:
+    - js_build_winml_win_x64
+    jobs:
+    - job: test
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-winml-win-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-winml-win-x64'
+      steps:
+      - checkout: self
+        clean: true
+      - template: ../../templates/checkout-steps.yml@self
+        parameters:
+          repoName: test-data-shared
+      - template: steps-test-js.yml
+        parameters:
+          rid: 'win-x64'
+          prebuildArtifactDir: '$(Pipeline.Workspace)/js-prebuild-winml-win-x64'
+          testDataSharedDir: '$(Build.SourcesDirectory)/test-data-shared'
 
-- stage: js_pack
-  displayName: 'JS SDK: Pack multi-platform npm tarball'
-  dependsOn:
-  - js_build_win_x64
-  - js_build_win_arm64
-  - js_build_linux_x64
-  - js_build_osx_arm64
-  jobs:
-  - job: pack
-    pool:
-      name: onnxruntime-Win-CPU-2022
-      os: windows
-    templateContext:
-      inputs:
-      - input: pipelineArtifact
-        artifactName: 'version-info'
-        targetPath: '$(Pipeline.Workspace)/version-info'
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-win-x64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-win-x64'
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-win-arm64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-win-arm64'
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-linux-x64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-linux-x64'
-      - input: pipelineArtifact
-        artifactName: 'js-prebuild-osx-arm64'
-        targetPath: '$(Pipeline.Workspace)/js-prebuild-osx-arm64'
-      outputs:
-      - output: pipelineArtifact
-        artifactName: 'js-sdk'
-        targetPath: '$(Build.ArtifactStagingDirectory)/js-sdk'
-    steps:
-    - checkout: self
-      clean: true
-    - template: steps-pack-js.yml
-      parameters:
-        outputDir: '$(Build.ArtifactStagingDirectory)/js-sdk'
+  - stage: js_pack_winml
+    displayName: 'JS SDK: Pack foundry-local-sdk-winml npm tarball'
+    dependsOn:
+    - js_build_winml_win_x64
+    - js_build_winml_win_arm64
+    jobs:
+    - job: pack
+      pool:
+        name: onnxruntime-Win-CPU-2022
+        os: windows
+      templateContext:
+        inputs:
+        - input: pipelineArtifact
+          artifactName: 'version-info'
+          targetPath: '$(Pipeline.Workspace)/version-info'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-winml-win-x64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-winml-win-x64'
+        - input: pipelineArtifact
+          artifactName: 'js-prebuild-winml-win-arm64'
+          targetPath: '$(Pipeline.Workspace)/js-prebuild-winml-win-arm64'
+        outputs:
+        - output: pipelineArtifact
+          artifactName: 'js-sdk-winml'
+          targetPath: '$(Build.ArtifactStagingDirectory)/js-sdk'
+      steps:
+      - checkout: self
+        clean: true
+      - template: steps-pack-js.yml
+        parameters:
+          outputDir: '$(Build.ArtifactStagingDirectory)/js-sdk'
+          isWinML: true
diff --git a/.pipelines/v2/templates/stages-sdk-v2.yml b/.pipelines/v2/templates/stages-sdk-v2.yml
index 5a1c59ba..224cb56a 100644
--- a/.pipelines/v2/templates/stages-sdk-v2.yml
+++ b/.pipelines/v2/templates/stages-sdk-v2.yml
@@ -4,6 +4,7 @@
 #   1. Native C++ build + pack    (templates/stages-build-native.yml)
 #   2. C# SDK base + WinML        (templates/stages-cs.yml × 2)
 #   3. Python SDK base + WinML    (templates/stages-python.yml × 2)
+#   4. JS SDK base + WinML        (templates/stages-js.yml × 2)
 #
 # Assumes the caller has already emitted a `compute_version` stage that
 # publishes the `version-info` pipeline artifact (containing sdkVersion.txt
@@ -51,5 +52,12 @@ stages:
   parameters:
     variant: winml
 
-# ── JS SDK (single multi-platform tarball) ──
+# ── JS SDK (base) ──
 - template: stages-js.yml
+  parameters:
+    variant: base
+
+# ── JS SDK (WinML) ──
+- template: stages-js.yml
+  parameters:
+    variant: winml
diff --git a/.pipelines/v2/templates/steps-build-js.yml b/.pipelines/v2/templates/steps-build-js.yml
index 5e6ab1e7..faa6b58f 100644
--- a/.pipelines/v2/templates/steps-build-js.yml
+++ b/.pipelines/v2/templates/steps-build-js.yml
@@ -35,6 +35,10 @@ parameters:
   default: 'native'
   values: ['native', 'arm64']
   displayName: 'Cross-compile target arch for node-gyp on Windows x64 host. "native" = no cross.'
+- name: isWinML
+  type: boolean
+  default: false
+  displayName: 'When true, also stage Microsoft.Windows.AI.MachineLearning.dll for the WinML SKU'
 - name: signWindows
   type: boolean
   default: false
@@ -145,6 +149,20 @@ steps:
       Copy-Item $nativeLibPath -Destination $dst -Force
       Write-Host "  staged $(nativeLib)"
 
+      # WinML SKU: bundle Microsoft.Windows.AI.MachineLearning.dll next to
+      # foundry_local.dll. winml_ep_bootstrapper.cc::LoadWinMLDllFromOwnDirectory
+      # resolves it relative to foundry_local.dll's own directory at load time,
+      # so packagers must keep these two files co-located in prebuilds/<plat>-<arch>/.
+      # The DLL is signed by Microsoft via NuGet, so it is intentionally
+      # excluded from the ESRP signing pattern below (no re-sign needed).
+      $isWinML = $${{ parameters.isWinML }}
+      if ($isWinML) {
+        $winmlDllPath = Join-Path "${{ parameters.nativeArtifactDir }}" "Microsoft.Windows.AI.MachineLearning.dll"
+        if (-not (Test-Path $winmlDllPath)) { throw "WinML DLL not found: $winmlDllPath" }
+        Copy-Item $winmlDllPath -Destination $dst -Force
+        Write-Host "  staged Microsoft.Windows.AI.MachineLearning.dll"
+      }
+
       Get-ChildItem $dst | ForEach-Object { Write-Host "    $($_.Name)  $($_.Length) bytes" }
     displayName: 'Stage prebuild directory'
 
diff --git a/.pipelines/v2/templates/steps-pack-js.yml b/.pipelines/v2/templates/steps-pack-js.yml
index 439ab41f..daa76e96 100644
--- a/.pipelines/v2/templates/steps-pack-js.yml
+++ b/.pipelines/v2/templates/steps-pack-js.yml
@@ -19,6 +19,10 @@ parameters:
   type: string
   default: '$(Build.ArtifactStagingDirectory)/js-sdk'
   displayName: 'Directory where the packed .tgz is staged for upload'
+- name: isWinML
+  type: boolean
+  default: false
+  displayName: 'When true, pack as foundry-local-sdk-winml (Windows-only prebuilds).'
 
 steps:
 
@@ -32,12 +36,22 @@ steps:
       if (Test-Path $dst) { Remove-Item -Recurse -Force $dst }
       New-Item -ItemType Directory -Force -Path $dst | Out-Null
 
-      $sources = @(
-        @{ rid = 'win-x64'; plat = 'win32-x64' },
-        @{ rid = 'win-arm64'; plat = 'win32-arm64' },
-        @{ rid = 'linux-x64'; plat = 'linux-x64' },
-        @{ rid = 'osx-arm64'; plat = 'darwin-arm64' }
-      )
+      $isWinML = $${{ parameters.isWinML }}
+      if ($isWinML) {
+        # WinML SKU is Windows-only — mirrors the foundry-local-sdk-winml
+        # Python wheel matrix. WinML 2.x is a Windows-only runtime.
+        $sources = @(
+          @{ rid = 'winml-win-x64'; plat = 'win32-x64' },
+          @{ rid = 'winml-win-arm64'; plat = 'win32-arm64' }
+        )
+      } else {
+        $sources = @(
+          @{ rid = 'win-x64'; plat = 'win32-x64' },
+          @{ rid = 'win-arm64'; plat = 'win32-arm64' },
+          @{ rid = 'linux-x64'; plat = 'linux-x64' },
+          @{ rid = 'osx-arm64'; plat = 'darwin-arm64' }
+        )
+      }
 
       foreach ($entry in $sources) {
         $src = "$(Pipeline.Workspace)/js-prebuild-$($entry.rid)/prebuilds/$($entry.plat)"
@@ -64,6 +78,19 @@ steps:
       if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
   displayName: 'Stamp package version'
 
+# Rewrite the package name for the WinML SKU. Mirrors the Python build backend's
+# FL_PYTHON_PACKAGE_NAME env-var mechanism; npm exposes a first-class JSON
+# editor (`npm pkg set`) so no PEP-517-style shim is needed. The same source
+# tree produces either `foundry-local-sdk` or `foundry-local-sdk-winml`.
+- ${{ if eq(parameters.isWinML, true) }}:
+  - pwsh: |
+        Set-Location "$(Build.SourcesDirectory)/sdk_v2/js"
+        npm pkg set name=foundry-local-sdk-winml
+        if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+        $name = (npm pkg get name) -replace '"', ''
+        Write-Host "Package name is now: $name"
+    displayName: 'Rename package to foundry-local-sdk-winml'
+
 - pwsh: |
       Set-Location "$(Build.SourcesDirectory)/sdk_v2/js"
       npm run build:ts
diff --git a/sdk_v2/js/README.md b/sdk_v2/js/README.md
index 05528f70..41a140ef 100644
--- a/sdk_v2/js/README.md
+++ b/sdk_v2/js/README.md
@@ -1,8 +1,28 @@
 # Foundry Local SDK — JavaScript / TypeScript (v2)
 
-Native bindings around the Foundry Local **C++ SDK**, surfaced as an ESM npm package
-(`foundry-local-sdk`). This README is the orientation guide for a developer who has just
-cloned the repo and wants to build, test, and debug the JS SDK.
+Native bindings around the Foundry Local **C++ SDK**, surfaced as an ESM npm package.
+This README is the orientation guide for a developer who has just cloned the repo and
+wants to build, test, and debug the JS SDK.
+
+Two package variants are published — choose the one that matches your target hardware:
+
+| Variant | Package | Native backends |
+|---------|---------|-----------------|
+| Standard (cross-platform) | `foundry-local-sdk` | CPU + CUDA + WebGPU (DirectML) |
+| WinML (Windows only) | `foundry-local-sdk-winml` | Windows ML execution providers + standard backends |
+
+```pwsh
+# Standard
+npm install foundry-local-sdk
+
+# WinML (Windows only)
+npm install foundry-local-sdk-winml
+```
+
+The WinML tarball additionally ships `Microsoft.Windows.AI.MachineLearning.dll` next
+to `foundry_local.dll` so EP discovery returns the WinML 2.x execution providers
+(OpenVINO, NvTensorRTRTX, etc.) out of the box. The two variants are mutually
+exclusive — install only one per project.
 
 > The architectural plan lives in [docs/PortJsToSdkV2.md](docs/PortJsToSdkV2.md). The
 > implementation conventions live in