diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9ee4e0..1e32151 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,11 @@ Activate / deactivate layer opaticty according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+0.5.6
+
+- feat: `check layers` new `clear frame out of range` option (Disabled by default)
+- ui: `check layers` show the number of targeted GP objects
+
 0.5.5
 
 - ui: add a _total count_ output file to display when output is muted
diff --git a/OP_setup_layers.py b/OP_setup_layers.py
index 196732e..a57ea6d 100644
--- a/OP_setup_layers.py
+++ b/OP_setup_layers.py
@@ -31,9 +31,13 @@ class GPEXP_OT_layers_state(bpy.types.Operator):
     set_blend_mode : BoolProperty(name='Set Regular Blend Mode',
         default=True, description='Check/Set blend mode to regular') # , options={'SKIP_SAVE'}
     
+    clear_frame_out_of_range : BoolProperty(name='Clear Frames Out Of Scene Range',
+        default=False, description='Delete frames that before scene start and after scene end range\nWith a tolerance of one frame to avoid problem\nAffect all layers)') # , options={'SKIP_SAVE'}
+    
     opacity_exclude_list : StringProperty(name='Skip',
         default='MA', description='Skip prefixes from this list when changing opacity\nSeparate multiple value with a comma (ex: MA,IN)') # , options={'SKIP_SAVE'}
 
+
     @classmethod
     def poll(cls, context):
         return context.object and context.object.type == 'GPENCIL'
@@ -49,6 +53,13 @@ class GPEXP_OT_layers_state(bpy.types.Operator):
     def draw(self, context):
         layout = self.layout
         layout.prop(self, 'all_objects')
+        total = len([o for o in context.scene.objects if o.type == 'GPENCIL'])
+        
+        target_num = total if self.all_objects else len([o for o in context.selected_objects if o.type == 'GPENCIL'])
+        layout.label(text=f'{target_num}/{total} targeted GP')
+
+        layout.separator()
+        layout.prop(self, 'clear_frame_out_of_range')
         layout.separator()
         layout.label(text='Set (or only perform a check):')
         row = layout.row()
@@ -70,6 +81,12 @@ class GPEXP_OT_layers_state(bpy.types.Operator):
         for ob in pool:
             changes.append(f'>> {ob.name}')
             layers = ob.data.layers
+            
+            if self.clear_frame_out_of_range:
+                ct = fn.clear_frame_out_of_range(ob, verbose=False)
+                if ct:
+                    changes.append(f'{ct} out of range frame deleted')
+
             for l in layers:
                 used = False
                 
@@ -117,6 +134,7 @@ class GPEXP_OT_layers_state(bpy.types.Operator):
                         l.blend_mode = 'REGULAR'
                     used = True
 
+
                 if used:
                     print()
             if changes:
diff --git a/__init__.py b/__init__.py
index 2ab0547..c1c9bc0 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": (0, 5, 5),
+    "version": (0, 5, 6),
     "blender": (2, 93, 0),
     "location": "View3D",
     "warning": "",
diff --git a/fn.py b/fn.py
index 661cbf4..e599000 100644
--- a/fn.py
+++ b/fn.py
@@ -1037,6 +1037,55 @@ def split_object_to_scene():
     export_crop_to_json()
 
 
+def clear_frame_out_of_range(o, verbose=False):
+    '''get a GP object
+    delete frame out of active scene range in all layers
+    return number of deleted frame
+    '''
+
+    scn = bpy.context.scene
+    ct = 0
+    if o.type != 'GPENCIL':
+        print(f'{o.name} not a Gpencil')
+        return 0
+    for l in o.data.layers:
+        first = True
+        for f in reversed(l.frames):
+
+            # after
+            if f.frame_number > scn.frame_end + 1:
+                if verbose:
+                    print(f'del: obj {o.name} > layer {l.info} > frame {f.frame_number}')
+                l.frames.remove(f)
+                ct += 1
+            
+            # before
+            elif f.frame_number < scn.frame_start - 1:
+                if first:
+                    first = False
+                    continue
+                if verbose:
+                    print(f'del: obj {o.name} > layer {l.info} > frame {f.frame_number}')
+                l.frames.remove(f)
+                ct += 1
+
+    # print('INFO', f'{ct} frames deleted')
+    return ct
+
+
+## not used
+def clear_frame_out_of_range_all_object():
+    scene = bpy.context.scene
+    ct = 0
+    for o in scene.objects:
+        if o.type == 'GPENCIL':
+            nct = clear_frame_out_of_range(o, verbose=False)
+            print(f'{o.name}: {nct} frames deleted')
+            ct += nct
+    print(f'{ct} gp frames deleted')
+    return ct
+
+
 """
 def split_object_to_scene():
     '''Create a new scene from selection'''