diff --git a/connect_gui.py b/connect_gui.py
index 9714118..998da25 100644
--- a/connect_gui.py
+++ b/connect_gui.py
@@ -6,3 +6,4 @@ def connect_gui(app):
     app.gui.main_window.openFileTabs.tabCloseRequested.connect(app.file_actions.close_current_file)
     app.gui.QTMainWindow.closeEvent = app.utils.on_close
     app.gui.main_window.menuSettings.triggered.connect(app.gui.main_window.settingsDock.show)
+    app.gui.main_window.bitsAreSquaresSetting.stateChanged.connect(app.utils.update_font_in_all_bit_editors)
diff --git a/utils.py b/utils.py
index 8f51c1a..40cf792 100644
--- a/utils.py
+++ b/utils.py
@@ -2,6 +2,7 @@
 
 from pathlib import Path
 from PyQt6.QtWidgets import QMessageBox
+from PyQt6.QtGui import QFont
 
 
 class Utils:
@@ -74,3 +75,14 @@ class Utils:
                     event.ignore()
 
         print("Bye!")
+
+    def update_font_in_all_bit_editors(self):
+        for file_path in self.app.open_files:
+            editor = self.app.open_files[file_path].bit_editor
+
+            square = self.app.gui.main_window.bitsAreSquaresSetting.isChecked()
+
+            spacing = 200 if square else 100  # add spacing when setting is checked
+
+            editor.font.setLetterSpacing(QFont.SpacingType.PercentageSpacing, spacing)
+            editor.input.setFont(editor.font)