diff --git a/page_splitter.py b/page_splitter.py
index 9dbd1aa..34d5536 100644
--- a/page_splitter.py
+++ b/page_splitter.py
@@ -4,6 +4,7 @@ from tkinter import messagebox
 from PIL import Image, ImageTk, ImageDraw
 import sys
 import os
+import re
 import glob
 import shutil
 from pypdf import PdfReader, PdfWriter
@@ -288,7 +289,10 @@ class PDFPreviewer:
     def finish_and_process(self):
         """Starts the PDF splitting process and moves files."""
         self.split_pdf()
+        # print("Debug : ", self.page_settings)
+        # input("Splitting done. Continue ?")
         self.reorder_pdfs()
+        # input("Reorder done. Continue ?")
         self.concate_files()
 
         # Logic to move original to backup and replace with new file
@@ -421,7 +425,13 @@ class PDFPreviewer:
     def concate_files(self):
         writer = PdfWriter()
 
-        pdf_files = sorted(glob.glob(os.path.join(self.reorder_dir, "*.pdf")))
+        def natural_key(text):
+            return [int(c) if c.isdigit() else c.lower() for c in re.split(r'(\d+)', text)]
+
+        pdf_files = sorted(
+            glob.glob(os.path.join(self.reorder_dir, "*.pdf")),
+            key=natural_key
+        )
 
         for pdf in pdf_files:
             reader = PdfReader(pdf)