diff --git a/file.py b/file.py
index 40882e6..bc3854c 100644
--- a/file.py
+++ b/file.py
@@ -27,17 +27,33 @@ class FileActions:
         file.write(data)
         file.close()
 
+        self.app.open_files[path].not_saved = False
+
     def save_current_file(self):
         current_tab = self.app.main_window.openFileTabs.currentWidget()
         current_file_path = current_tab.objectName()
 
         self.save_file(current_file_path)
 
+    def close_file(self, path, tab_index):
+        self.app.main_window.openFileTabs.removeTab(tab_index)
+        del self.app.open_files[path]
+
     def close_current_file(self):
         tab_index = self.app.main_window.openFileTabs.currentIndex()
-        self.app.main_window.openFileTabs.removeTab(tab_index)
-        current_file_path = self.app.main_window.openFileTabs.currentWidget().objectName()
-        del self.app.open_files[current_file_path]
+        current_file_path = self.app.main_window.openFileTabs.currentWidget().objectName()#
+
+        if self.app.open_files[current_file_path].not_saved:
+            save_or_not = self.app.utils.unsaved_changes_popup()
+
+            match save_or_not:
+                case "save":
+                    self.save_file(current_file_path)
+
+                case "cancel":
+                    return
+
+        self.close_file(current_file_path, tab_index)
 
 
 class File:
@@ -46,6 +62,7 @@ class File:
 
         self.path = path
         self.name = name
+        self.not_saved = False
 
         file = open(path, "rb")
         file_content = file.read()
@@ -60,6 +77,7 @@ class File:
         self.content_binary_input = QPlainTextEdit(self.content_widget)
         self.content_widget_layout.addWidget(self.content_binary_input)
         self.content_binary_input.setPlainText(self.app.utils.bstring_to_oz(file_content))
+        self.content_binary_input.textChanged.connect(self.on_edit)
 
         self.content_widget.setLayout(self.content_widget_layout)
 
@@ -67,3 +85,6 @@ class File:
             self.content_widget,
             self.name
         )
+
+    def on_edit(self):
+        self.not_saved = True
diff --git a/main.py b/main.py
index 9ca6e73..76c7419 100644
--- a/main.py
+++ b/main.py
@@ -25,6 +25,8 @@ class BreadEditor:
         connect_gui(self)
 
     def run(self):
+        self.utils.popup_init()
+
         self.QTMainWindow.show()
         sys.exit(self.qt_app.exec())
 
diff --git a/utils.py b/utils.py
index 0a802f7..f89318d 100644
--- a/utils.py
+++ b/utils.py
@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 
 from pathlib import Path
+from PyQt6.QtWidgets import QMessageBox
 
 
 class Utils:
@@ -9,6 +10,27 @@ class Utils:
 
         self.home_path = str(Path.home())
 
+    def popup_init(self):
+        self.usc_popup = QMessageBox()  # create a popup window that notifies the user that we have unsaved changes
+        self.usc_popup.setWindowTitle("Unsaved Changes!")  # usc means unsaved changes
+        self.usc_popup.setText("The file you are trying to close has unsaved changes.")
+        self.usc_popup.setStandardButtons(
+            QMessageBox.StandardButton.Save |
+            QMessageBox.StandardButton.Discard |
+            QMessageBox.StandardButton.Cancel
+        )
+
+    def unsaved_changes_popup(self):
+        button = self.usc_popup.exec()
+
+        match button:
+            case QMessageBox.StandardButton.Save:
+                return "save"
+            case QMessageBox.StandardButton.Discard:
+                return "discard"
+            case QMessageBox.StandardButton.Cancel:
+                return "cancel"
+
     def bstring_to_oz(self, data):  # convert binary data to a string of ones and zeros (oz)
         oz_bytes = []