diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0663442..d08ce76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,11 @@ Activate / deactivate layer opacity according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+1.3.4
+
+- added: multi object merge
+- changed: little tweak on GP render startup
+
 1.3.3
 
 - fixed: problem evaluating broken modifier target
diff --git a/OP_merge_layers.py b/OP_merge_layers.py
index 52628e2..8f61b57 100644
--- a/OP_merge_layers.py
+++ b/OP_merge_layers.py
@@ -247,11 +247,17 @@ class GPEXP_OT_merge_viewlayers_to_active(bpy.types.Operator):
     def poll(cls, context):
         return context.object and context.object.type == 'GPENCIL'
 
+    multi_object_merge : bpy.props.BoolProperty(default=False, options={'SKIP_SAVE'})
+
     def execute(self, context):
-        ob = bpy.context.object
-        # layers = [l for l in ob.data.layers if l.select and not l.hide]
+        ob = context.object
         act = ob.data.layers.active
-        layers = [l for l in ob.data.layers if l.select and l != act]
+
+        if self.multi_object_merge:
+
+            layers = [l for ob in context.selected_objects if ob.type == 'GPENCIL' for l in ob.data.layers if l.select and l != act]
+        else:
+            layers = [l for l in ob.data.layers if l.select and l != act]
 
         ## Tested in func
         # rd_scn = bpy.data.scenes.get('Render')
diff --git a/__init__.py b/__init__.py
index 311f6ec..380f83e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,7 +2,7 @@ bl_info = {
     "name": "GP Render",
     "description": "Organise export of gp layers through compositor output",
     "author": "Samuel Bernou",
-    "version": (1, 3, 3),
+    "version": (1, 3, 4),
     "blender": (2, 93, 0),
     "location": "View3D",
     "warning": "",
diff --git a/app_templates/GP_Render/startup.blend b/app_templates/GP_Render/startup.blend
index ce86047..042b184 100644
Binary files a/app_templates/GP_Render/startup.blend and b/app_templates/GP_Render/startup.blend differ
diff --git a/fn.py b/fn.py
index e7a42c3..217ec14 100644
--- a/fn.py
+++ b/fn.py
@@ -413,7 +413,10 @@ def get_frames_bbox(node_tree):
 
 ## -- nodes helper functions
 
-def merge_gplayer_viewlayers(ob, act=None, layers=None):
+def merge_gplayer_viewlayers(ob=None, act=None, layers=None):
+    '''ob is not needed if active and layers are passed'''
+    if ob is None:
+        ob = bpy.context.object
     if act is None:
         act = ob.data.layers.active
     if layers is None:
diff --git a/ui.py b/ui.py
index 10ec309..b612fc0 100644
--- a/ui.py
+++ b/ui.py
@@ -206,7 +206,10 @@ class GPEXP_PT_gp_dopesheet_ui(Panel):
         ct = len([l for l in context.object.data.layers if l.select])
         txt = f'Merge {ct} layers'
         # merge layers from dopesheet
-        row.operator('gp.merge_viewlayers_to_active', text=txt, icon='SELECT_EXTEND')
+        row.operator('gp.merge_viewlayers_to_active', text=txt, icon='SELECT_EXTEND').multi_object_merge = True
+        ct = len([l for ob in context.selected_objects if ob.type == 'GPENCIL' for l in ob.data.layers if l.select])
+        txt = f'Multi: {ct} layers'
+        row.operator('gp.merge_viewlayers_to_active', text=txt, icon='SELECT_EXTEND').multi_object_merge = True
         row.enabled= ct > 1
 
         col.operator('gpexp.auto_merge_adjacent_prefix', icon='SELECT_EXTEND')