diff --git a/app.py b/app.py
index 8c8c5cc..aaf50d6 100755
--- a/app.py
+++ b/app.py
@@ -11,7 +11,7 @@ from flask import render_template, request
 app = Flask(__name__)
 
 gancio_instance = 'balotta.org'
-templates = [x.stem for x in pathlib.Path('./templates/flyers/').glob("*.html")]
+templates = json.load(open('./templates.json'))
 default_template = 'simple'
 events_ep = f'https://{gancio_instance}/api/events'
 
@@ -60,10 +60,14 @@ def main():
 def flyer():
     relevant_events = request.args.getlist('events', type=int)
     template = request.args.get("template", default=default_template, type=str)
-    if template not in templates:
+    if template not in [ t['name'] for t in templates ]:
         return "template not found", 404
+    template = [t for t in templates if t['name'] == template][0]
     events = fetch_events(events_ep)
-    events = [ e for e in events if e['id'] in relevant_events ]    
-    return render_template(f'flyers/{template}.html', events=events)
+    events = [ e for e in events if e['id'] in relevant_events ]
+    params = {}
+    if 'params' in template:
+        params = template['params']
+    return render_template(f'flyers/{template["baseTemplate"]}.html', events=events, params=params)
     
     
diff --git a/templates.json b/templates.json
new file mode 100644
index 0000000..e2bcb89
--- /dev/null
+++ b/templates.json
@@ -0,0 +1,29 @@
+[
+  {
+    "name": "simple",
+    "baseTemplate": "simple",
+    "paperSize": "A3",
+    "maxEvents": 24,
+    "pages": 1,
+    "params": {
+      "colorMode": "black"
+    }
+  },
+  {
+    "name": "simple-white",
+    "baseTemplate": "simple",
+    "paperSize": "A3",
+    "maxEvents": 24,
+    "pages": 1,
+    "params": {
+      "colorMode": "white"
+    }
+  },
+  {
+    "name": "asymmetric",
+    "baseTemplate": "asymmetric",
+    "paperSize": "A3",
+    "maxEvents": 24,
+    "pages": 1
+  }
+]
diff --git a/templates/index.html b/templates/index.html
index a8ed37a..2255083 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -10,15 +10,28 @@ L'attuale layout può contenere fino a 24 eventi.
 <br>
 <form action="/flyer" target="_blank">
   <label for="template">Scegli un template</label>
-  <select id="template" name="template">
+  <select onchange="templateSelected(this)" id="template" name="template">
     {% for template in templates %}
-    <option value="{{template}}">{{template}}</option>
+    <option value="{{template.name}}">{{template.name}}</option>
     {% endfor %} 
   </select> 
   <br>
   {% for event in events %}
-<input type="checkbox" {% if loop.index <= 24 %} checked {% endif %} id="{{event.id}}" name="events" value="{{event.id}}">
+<input type="checkbox"  id="{{event.id}}" name="events" value="{{event.id}}">
 <label for="{{event.id}}"> {{loop.index}} [ {{event.when}} ] {{ event.title }}</label><br>
 {% endfor %}
 <input type="submit" value="Genera volantino">
 </form>
+<script>
+  const templates={{templates|tojson}}
+  function templateSelected(el) {
+    const template = templates.find((t) => t.name == el.value)
+    const events = document.querySelectorAll("[name=events]")
+    var maxEvents = template.maxEvents
+    events.forEach((e) => {
+      e.checked = maxEvents > 0
+      maxEvents--
+    })
+  }
+</script>
+