diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 982bc2e..74ce8ce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,23 +14,28 @@ jobs:
         include:
           - name: Dockerfile
             expected: '["linux/amd64","linux/arm64"]'
+            expected_csv: 'linux/amd64,linux/arm64'
             with:
               dockerfile: tests/Dockerfile
           - name: Supplied Image
             expected: '["linux/amd64","linux/arm64"]'
+            expected_csv: 'linux/amd64,linux/arm64'
             with:
               image: ghcr.io/wyrihaximusnet/php:8.3-zts-alpine-dev
           - name: Both
             expected: '["linux/arm64","linux/amd64","linux/arm","linux/arm","linux/386"]'
+            expected_csv: 'linux/arm64,linux/amd64,linux/arm,linux/arm,linux/386'
             with:
               dockerfile: tests/Dockerfile
               image: ghcr.io/home-assistant/home-assistant:2024.12.2
           - name: Multiple images
             expected: '["linux/arm64","linux/amd64"]'
+            expected_csv: 'linux/arm64,linux/amd64'
             with:
               image: ghcr.io/home-assistant/home-assistant:2024.12.2,ghcr.io/wyrihaximusnet/php:8.3-zts-alpine-dev
           - name: Multiple Dockerfiles
             expected: '["linux/amd64","linux/arm64"]'
+            expected_csv: 'linux/amd64,linux/arm64'
             with:
               dockerfile: tests/Dockerfile*
     steps:
@@ -39,9 +44,15 @@ jobs:
         id: platforms
         uses: ./
         with: ${{ matrix.with }}
-      - name: Assert Dockerfile Platforms
+      - name: Assert ${{ matrix.name }} Platforms (JSON)
         uses: nick-fields/assert-action@v2
         with:
           expected: ${{ matrix.expected }}
           actual: ${{ steps.platforms.outputs.platform }}
           comparison: exact
+      - name: Assert ${{ matrix.name }} Platforms (CSV)
+        uses: nick-fields/assert-action@v2
+        with:
+          expected: ${{ matrix.expected_csv }}
+          actual: ${{ steps.platforms.outputs.platform_csv }}
+          comparison: exact
diff --git a/README.md b/README.md
index b842eae..9959d82 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,11 @@ it will get the platforms for all of them but only return the platforms that are
 
 ## Output
 
-This action only outputs a list of platforms as JSON through `platform`.
+This action only outputs a list of platforms as JSON through `platform`, and as CSV `platform_csv`.
+
+For example when the found platforms are `linux/arm64` and `linux/amd64` the outputs are the following:
+* `plarform`: `["linux/arm64","linux/amd64"]`
+* `platform_csv`: `linux/arm64,linux/amd64`
 
 ## Example
 
diff --git a/action.yaml b/action.yaml
index 173cfd3..b04bd32 100644
--- a/action.yaml
+++ b/action.yaml
@@ -14,8 +14,11 @@ inputs:
     default: ''
 outputs:
   platform:
-    description: The upstream supported platforms
+    description: The upstream supported platforms as JSON array
     value: ${{ steps.platform.outputs.platform }}
+  platform_csv:
+    description: The upstream supported platforms as CSV
+    value: ${{ steps.platform_csv.outputs.platform_csv }}
 runs:
   using: "composite"
   steps:
@@ -58,3 +61,9 @@ runs:
         else
           printf "platform=%s" $(getPlatformsForImage ${{ steps.image.outputs.image }}) >> $GITHUB_OUTPUT
         fi
+
+    - name: Create CSV from JSON
+      id: platform_csv
+      shell: bash
+      run: |
+        printf "platform_csv=%s" $(echo "${{ steps.platform.outputs.platform }}"  | docker run -q -i --rm ghcr.io/wyrihaximusnet/php:8.3-nts-alpine-slim php -r 'echo str_replace(["[", "\"", "]"], "", trim(fgets(STDIN)));') >> $GITHUB_OUTPUT