diff --git a/.github/workflows/playground-preview.yml b/.github/workflows/playground-preview.yml
new file mode 100644
index 0000000..e4e63da
--- /dev/null
+++ b/.github/workflows/playground-preview.yml
@@ -0,0 +1,169 @@
+name: Playground preview
+
+# Builds the app — plus the prebuilt eXeLearning static editor, *downloaded*
+# from the editor's latest release rather than compiled here — into a ZIP the
+# Nextcloud Playground installs in the browser via the blueprint `installApp`
+# step.
+#
+#   - push to main  -> refresh the rolling `playground` prerelease asset
+#                      (exelearning.zip) that blueprint.json points at, so the
+#                      README badge always boots the latest main.
+#   - pull_request  -> publish a per-PR prerelease (playground-pr-<N>) and post
+#                      a one-click playground link as a sticky PR comment.
+#   - PR closed     -> delete that per-PR prerelease and its tag.
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    types: [opened, synchronize, reopened, closed]
+
+concurrency:
+  group: playground-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+  pull-requests: write
+
+env:
+  PLAYGROUND_URL: https://ateeducacion.github.io/nextcloud-playground/
+
+jobs:
+  build:
+    # Build on push to main, and on open/sync/reopen of PRs from this repo.
+    # Fork PRs run with a read-only token (no release write), so skip them.
+    if: >-
+      github.event_name == 'push' ||
+      (github.event.action != 'closed' &&
+       github.event.pull_request.head.repo.full_name == github.repository)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Resolve preview identity
+        id: id
+        run: |
+          set -euo pipefail
+          if [ "${{ github.event_name }}" = "push" ]; then
+            echo "tag=playground" >> "$GITHUB_OUTPUT"
+            echo "version=playground" >> "$GITHUB_OUTPUT"
+          else
+            echo "tag=playground-pr-${{ github.event.pull_request.number }}" >> "$GITHUB_OUTPUT"
+            echo "version=pr-${{ github.event.pull_request.number }}" >> "$GITHUB_OUTPUT"
+          fi
+
+      # Pulls the prebuilt static editor from the latest exelearning/exelearning
+      # release (e.g. exelearning-static-vX.Y.Z.zip) into js/editor/ — no bun
+      # build. `make package-zip` then bundles it. `clean` keeps js/editor/.
+      - name: Download the eXeLearning static editor (latest release)
+        run: make download-editor
+
+      - name: Build the playground ZIP
+        run: |
+          set -euo pipefail
+          make package-zip PACKAGE_VERSION=${{ steps.id.outputs.version }}
+          cp "build/artifacts/exelearning-${{ steps.id.outputs.version }}.zip" exelearning.zip
+          ls -lh exelearning.zip
+
+      - name: Publish exelearning.zip to the preview release
+        uses: softprops/action-gh-release@v3
+        with:
+          tag_name: ${{ steps.id.outputs.tag }}
+          name: ${{ steps.id.outputs.tag }}
+          prerelease: true
+          make_latest: false
+          files: exelearning.zip
+          fail_on_unmatched_files: true
+          body: >
+            Automated Nextcloud Playground preview build (not a real release).
+            Installed in the browser via the blueprint `installApp` step.
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      # Inline the blueprint (pointed at this PR's asset) as URL-safe base64 in
+      # ?blueprint= so we don't have to host a per-PR blueprint file. URLSearchParams
+      # turns '+' into a space, so '+/' must become '-_' and padding is dropped.
+      # The asset is fetched through the shared CORS proxy because GitHub release
+      # downloads are served from Azure Blob without Access-Control-Allow-Origin,
+      # which a cross-origin browser fetch from the playground would reject.
+      - name: Build PR playground link
+        if: github.event_name == 'pull_request'
+        id: link
+        run: |
+          set -euo pipefail
+          asset="https://zip-proxy.erseco.workers.dev/?repo=${{ github.repository }}&release=${{ steps.id.outputs.tag }}&asset=exelearning.zip"
+          jq --arg url "$asset" '(.steps[] | select(.step == "installApp")).url = $url' blueprint.json > blueprint.pr.json
+          # Sample fixtures are referenced from raw main; point them at this PR's
+          # commit so the preview reflects fixtures added/changed on the branch.
+          sed -i "s#/nextcloud-exelearning/main/tests/fixtures#/nextcloud-exelearning/${{ github.event.pull_request.head.sha }}/tests/fixtures#g" blueprint.pr.json
+          b64=$(base64 -w0 blueprint.pr.json | tr '+/' '-_' | tr -d '=')
+          echo "url=${PLAYGROUND_URL}?blueprint=${b64}" >> "$GITHUB_OUTPUT"
+
+      - name: Upsert PR comment
+        if: github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        env:
+          PREVIEW_URL: ${{ steps.link.outputs.url }}
+          PREVIEW_TAG: ${{ steps.id.outputs.tag }}
+        with:
+          script: |
+            const marker = '<!-- playground-preview -->';
+            const url = process.env.PREVIEW_URL;
+            const tag = process.env.PREVIEW_TAG;
+            const body = [
+              marker,
+              '### ▶️ Preview this PR in the Nextcloud Playground',
+              '',
+              `[**Open this PR in the Nextcloud Playground**](${url})`,
+              '',
+              "A fresh Nextcloud boots in your browser with this branch's " +
+                '`exelearning` app installed and enabled (log in as `admin` / `admin`, ' +
+                'then upload an `.elpx` in Files).',
+              '',
+              `Built artifact: \`exelearning.zip\` on the \`${tag}\` prerelease.`,
+              '',
+              '> The viewer relies on a scoped Service Worker; some viewer features ' +
+                "may be limited inside the playground's own Service Worker. Core " +
+                'install, Files and the app UI work.',
+            ].join('\n');
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.pull_request.number;
+            const comments = await github.paginate(github.rest.issues.listComments, {
+              owner, repo, issue_number,
+            });
+            const existing = comments.find((c) => c.body && c.body.includes(marker));
+            if (existing) {
+              await github.rest.issues.updateComment({ owner, repo, comment_id: existing.id, body });
+            } else {
+              await github.rest.issues.createComment({ owner, repo, issue_number, body });
+            }
+
+  cleanup:
+    if: >-
+      github.event_name == 'pull_request' &&
+      github.event.action == 'closed' &&
+      github.event.pull_request.head.repo.full_name == github.repository
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Delete the per-PR preview release and tag
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          tag="playground-pr-${{ github.event.pull_request.number }}"
+          gh release delete "$tag" --cleanup-tag --yes || echo "No release $tag to delete."
diff --git a/Makefile b/Makefile
index 2e85c8b..b4556b5 100644
--- a/Makefile
+++ b/Makefile
@@ -50,6 +50,9 @@ RELEASE_DIR := $(BUILD_DIR)/$(APP_NAME)
 # from appinfo/info.xml, e.g. `make package PACKAGE_VERSION=0.2.0-rc1`.
 PACKAGE_VERSION ?= $(APP_VERSION)
 PACKAGE_NAME := $(APP_NAME)-$(PACKAGE_VERSION).tar.gz
+# Same staged tree as PACKAGE_NAME but as a ZIP — the format the Nextcloud
+# Playground `installApp` blueprint step extracts in the browser.
+PACKAGE_ZIP := $(APP_NAME)-$(PACKAGE_VERSION).zip
 
 # --- PHP runtime selection ----------------------------------------------
 # appinfo/info.xml declares PHP 8.2–8.5 as the supported range. Pick the
@@ -104,7 +107,7 @@ NC_ADMIN_PASS ?= admin
 .PHONY: help install build dev watch-js lint typecheck test clean \
 	composer-install composer-test cs-check cs-fix php-version \
 	download-editor fetch-editor-source build-editor clean-editor \
-	package appstore \
+	package package-zip appstore \
 	check-docker \
 	up down restart logs shell occ-status status sync ci-matrix \
 	seed-fixtures
@@ -299,6 +302,37 @@ package: clean build
 	@echo "   - version: $(PACKAGE_VERSION)"
 	@echo "================================================================"
 
+# Produce build/artifacts/$(APP_NAME)-$(PACKAGE_VERSION).zip with
+# `$(APP_NAME)/` as the single top-level directory. Same staged tree as
+# `package` (filtered through .distignore, version stamped) but zipped —
+# this is what the Nextcloud Playground downloads and extracts in the
+# browser via the blueprint `installApp` step. Run `make download-editor`
+# first if you want the embedded eXeLearning editor bundled in.
+package-zip: clean build
+	@if [ ! -f .distignore ]; then \
+		echo "Error: .distignore is missing — cannot build a distribution package."; \
+		exit 1; \
+	fi
+	@command -v zip >/dev/null 2>&1 || { echo "Error: 'zip' is required for package-zip."; exit 1; }
+	@mkdir -p $(ARTIFACT_DIR)
+	@rm -rf $(RELEASE_DIR)
+	@mkdir -p $(RELEASE_DIR)
+	@echo ">> staging $(APP_NAME) $(PACKAGE_VERSION) into $(RELEASE_DIR)"
+	@rsync -a --delete --exclude-from=.distignore ./ $(RELEASE_DIR)/
+	@echo ">> stamping version $(PACKAGE_VERSION) into staged appinfo/info.xml"
+	@sed -i.bak -E 's|<version>[^<]*</version>|<version>$(PACKAGE_VERSION)</version>|' $(RELEASE_DIR)/appinfo/info.xml
+	@rm -f $(RELEASE_DIR)/appinfo/info.xml.bak
+	@echo ">> creating $(ARTIFACT_DIR)/$(PACKAGE_ZIP)"
+	@rm -f $(ARTIFACT_DIR)/$(PACKAGE_ZIP)
+	@cd $(BUILD_DIR) && zip -qr -X $(ARTIFACT_DIR)/$(PACKAGE_ZIP) $(APP_NAME)
+	@rm -rf $(RELEASE_DIR)
+	@echo
+	@echo "================================================================"
+	@echo " Built $(ARTIFACT_DIR)/$(PACKAGE_ZIP)"
+	@echo "   - app id : $(APP_NAME)"
+	@echo "   - version: $(PACKAGE_VERSION)"
+	@echo "================================================================"
+
 # Backwards-compatible alias for the historical target name.
 appstore: package
 
diff --git a/README.md b/README.md
index d1eede6..126764e 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,30 @@
 # nextcloud-exelearning
 
 [![CI](https://github.com/exelearning/nextcloud-exelearning/actions/workflows/ci.yml/badge.svg)](https://github.com/exelearning/nextcloud-exelearning/actions/workflows/ci.yml)
+[![Open in Nextcloud Playground](https://img.shields.io/badge/Nextcloud%20Playground-Open-0082c9?logo=nextcloud&logoColor=white)](https://ateeducacion.github.io/nextcloud-playground/?blueprint-url=https://raw.githubusercontent.com/exelearning/nextcloud-exelearning/main/blueprint.json)
 
 Preview and edit [eXeLearning](https://exelearning.net/) `.elpx` packages
 directly inside Nextcloud Files.
 
+## Quick test (no install)
+
+The fastest way to try this app is the **Nextcloud Playground** — a full
+Nextcloud running in your browser via WebAssembly, no server required. Click
+the badge at the top of this README and you'll get a fresh Nextcloud with:
+
+* The `exelearning` app installed and enabled.
+* The Files app open, logged in as `admin` / `admin`.
+
+Upload an `.elpx` package in Files and click it to open the viewer. Nothing is
+installed locally; everything runs in the browser and is discarded when you
+close the tab.
+
+The instance is provisioned from [`blueprint.json`](blueprint.json), which
+installs the app with the playground's `installApp` step from a built
+`exelearning.zip` artifact. Every pull request gets its own one-click
+playground link (posted as a PR comment) built from that branch — see
+[`.github/workflows/playground-preview.yml`](.github/workflows/playground-preview.yml).
+
 ## What this app does
 
 When a user clicks a `.elpx` file in Nextcloud Files:
diff --git a/blueprint.json b/blueprint.json
new file mode 100644
index 0000000..a1fa879
--- /dev/null
+++ b/blueprint.json
@@ -0,0 +1,49 @@
+{
+  "$schema": "https://raw.githubusercontent.com/ateeducacion/nextcloud-playground/main/assets/blueprints/blueprint-schema.json",
+  "meta": {
+    "title": "nextcloud-exelearning Playground",
+    "author": "eXeLearning",
+    "description": "A fresh Nextcloud in the browser with the eXeLearning app installed, ready to preview and edit .elpx packages in Files."
+  },
+  "landingPage": "/index.php/apps/files/",
+  "siteOptions": {
+    "title": "eXeLearning on Nextcloud",
+    "locale": "en",
+    "timezone": "UTC"
+  },
+  "admin": {
+    "username": "admin",
+    "password": "admin",
+    "email": "admin@example.com"
+  },
+  "steps": [
+    {
+      "step": "installApp",
+      "appId": "exelearning",
+      "url": "https://zip-proxy.erseco.workers.dev/?repo=exelearning/nextcloud-exelearning&release=playground&asset=exelearning.zip"
+    },
+    {
+      "step": "writeFile",
+      "path": "config/mimetypemapping.json",
+      "content": "{\"elpx\":[\"application/vnd.exelearning.elpx\",\"application/zip\"],\"elp\":[\"application/vnd.exelearning.elpx\",\"application/zip\"]}"
+    },
+    {
+      "step": "writeFile",
+      "path": "config/mimetypealiases.json",
+      "content": "{\"application/vnd.exelearning.elpx\":\"exelearning\",\"application/x-exelearning\":\"exelearning\"}"
+    },
+    { "step": "runOcc", "args": ["maintenance:mimetype:update-js"] },
+    { "step": "runOcc", "args": ["maintenance:mimetype:update-db", "--repair-filecache"] },
+    {
+      "step": "writeFile",
+      "path": "data/admin/files/exelearning-samples/un-contenido-de-ejemplo-para-probar-estilos-y-catalogacion.elpx",
+      "url": "https://raw.githubusercontent.com/exelearning/nextcloud-exelearning/main/tests/fixtures/un-contenido-de-ejemplo-para-probar-estilos-y-catalogacion.elpx"
+    },
+    {
+      "step": "writeFile",
+      "path": "data/admin/files/exelearning-samples/propiedades.elpx",
+      "url": "https://raw.githubusercontent.com/exelearning/nextcloud-exelearning/main/tests/fixtures/propiedades.elpx"
+    },
+    { "step": "runOcc", "args": ["files:scan", "admin"] }
+  ]
+}
diff --git a/tests/fixtures/propiedades.elpx b/tests/fixtures/propiedades.elpx
new file mode 100644
index 0000000..02d2525
Binary files /dev/null and b/tests/fixtures/propiedades.elpx differ