diff --git a/src/mcedit2/editortools/__init__.py b/src/mcedit2/editortools/__init__.py
index e82fed2..419be91 100644
--- a/src/mcedit2/editortools/__init__.py
+++ b/src/mcedit2/editortools/__init__.py
@@ -57,6 +57,8 @@ class EditorTool(QtCore.QObject):
     overlayNode = None
     editorSession = weakrefprop()
 
+    modifiesWorld = False
+
     def __init__(self, editorSession, *args, **kwargs):
         """
         Initialize toolWidget here.
@@ -120,6 +122,8 @@ class EditorTool(QtCore.QObject):
     toolPicked = QtCore.Signal(object)
 
     def pick(self):
+        if self.editorSession.readonly and self.modifiesWorld:
+            return
         self.toolPicked.emit(self.name)
 
     def pickToolAction(self):
@@ -142,6 +146,7 @@ class EditorTool(QtCore.QObject):
             triggered=self.pick,
             checkable=True,
             icon=icon,
+            enabled=not(self.editorSession.readonly and self.modifiesWorld)
             )
         action.toolName = name
 
diff --git a/src/mcedit2/editortools/brush/__init__.py b/src/mcedit2/editortools/brush/__init__.py
index 7428ef1..69adb07 100644
--- a/src/mcedit2/editortools/brush/__init__.py
+++ b/src/mcedit2/editortools/brush/__init__.py
@@ -112,6 +112,8 @@ class BrushTool(EditorTool):
     iconName = "brush"
     maxBrushSize = 512
 
+    modifiesWorld = True
+
     def __init__(self, editorSession, *args, **kwargs):
         super(BrushTool, self).__init__(editorSession, *args, **kwargs)
         self.toolWidget = BrushToolWidget()
diff --git a/src/mcedit2/editortools/clone.py b/src/mcedit2/editortools/clone.py
index 5111d5f..a094441 100644
--- a/src/mcedit2/editortools/clone.py
+++ b/src/mcedit2/editortools/clone.py
@@ -110,6 +110,7 @@ class CloneTool(EditorTool):
     """
     iconName = "clone"
     name = "Clone"
+    modifiesWorld = True
 
     def __init__(self, editorSession, *args, **kwargs):
         super(CloneTool, self).__init__(editorSession, *args, **kwargs)
diff --git a/src/mcedit2/editortools/flood_fill.py b/src/mcedit2/editortools/flood_fill.py
index 9a461a3..d580780 100644
--- a/src/mcedit2/editortools/flood_fill.py
+++ b/src/mcedit2/editortools/flood_fill.py
@@ -19,6 +19,7 @@ log = logging.getLogger(__name__)
 class FloodFillTool(EditorTool):
     name = "Flood Fill"
     iconName = "flood_fill"
+    modifiesWorld = True
 
     def mousePress(self, event):
         pos = event.blockPosition
diff --git a/src/mcedit2/editortools/generate.py b/src/mcedit2/editortools/generate.py
index db0fd5a..d6867e4 100644
--- a/src/mcedit2/editortools/generate.py
+++ b/src/mcedit2/editortools/generate.py
@@ -147,6 +147,7 @@ class GenerateTool(EditorTool):
     iconName = "generate"
 
     instantDisplayChunks = 32
+    modifiesWorld = True
 
     def __init__(self, *args, **kwargs):
         EditorTool.__init__(self, *args, **kwargs)
diff --git a/src/mcedit2/editortools/move.py b/src/mcedit2/editortools/move.py
index 4f5a85f..dd7df4b 100644
--- a/src/mcedit2/editortools/move.py
+++ b/src/mcedit2/editortools/move.py
@@ -98,6 +98,7 @@ class MoveFinishCommand(SimpleRevisionCommand):
 class MoveTool(EditorTool):
     iconName = "move"
     name = "Move"
+    modifiesWorld = True
 
     def __init__(self, editorSession, *args, **kwargs):
         super(MoveTool, self).__init__(editorSession, *args, **kwargs)