diff --git a/CHANGES.rst b/CHANGES.rst
index 9a44bf55..03074e63 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,9 @@ Changelog
 1.1.19 (unreleased)
 -------------------
 
+- WEB-3934 : Hide image_size field
+  [boulch]
+
 - WEB-3953 : Remove cropping from background_image field
   [boulch]
 
diff --git a/src/imio/smartweb/core/contents/sections/text/forms.py b/src/imio/smartweb/core/contents/sections/text/forms.py
index 605111fc..6bfc5283 100644
--- a/src/imio/smartweb/core/contents/sections/text/forms.py
+++ b/src/imio/smartweb/core/contents/sections/text/forms.py
@@ -23,6 +23,7 @@ def update(self):
     def updateFields(self):
         super(TextCustomAddForm, self).updateFields()
         self.fields["ILeadImageBehavior.image_caption"].mode = INPUT_MODE
+        self.fields["image_size"].mode = HIDDEN_MODE
 
 
 class TextCustomAddView(DefaultAddView):
@@ -42,6 +43,7 @@ def update(self):
     def updateFields(self):
         super(TextCustomEditForm, self).updateFields()
         self.fields["ILeadImageBehavior.image_caption"].mode = INPUT_MODE
+        self.fields["image_size"].mode = HIDDEN_MODE
 
 
 TextCustomEditView = layout.wrap_form(TextCustomEditForm)