diff --git a/file.py b/file.py
new file mode 100644
index 0000000..f6077ac
--- /dev/null
+++ b/file.py
@@ -0,0 +1,55 @@
+import os
+
+def check_file(input_dir, output_dir, Release_version = True):
+    file_list = []
+    output_file_list = []
+    files_removed = []
+
+    input_dir = os.listdir(input_dir)
+    output_dir = os.listdir(output_dir)
+    
+    for file_in in input_dir:
+        if not file_in.startswith('.'):
+            file_list.append(file_in)
+
+    if(Release_version is True):
+        print("\nChecking valid files...")
+        for file_out in output_dir:
+            if file_out.lower().endswith('.png'):
+                output_file_list.append(file_out)
+
+        # solving https://github.com/deeppomf/DeepCreamPy/issues/25
+        # appending in list with reason as tuple (file name, reason)
+        for lhs in file_list:
+            lhs.lowwer()
+            if not lhs.lower().endswith('.png') :
+                files_removed.append((lhs, 0))
+            for rhs in output_file_list:
+                if(lhs == rhs):
+                    files_removed.append((lhs, 1))
+
+        # seperated detecteing same file names and deleting file name list
+        # just in case of index_error and show list of files which will not go though
+        # decensor process
+        print("\n＃＃＃ These files will not be decensored for following reason  ＃＃＃\n")
+
+        error_messages(files_removed)
+        input("\nPress anything to continue...")
+
+        print("\n＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃\n")
+
+    return file_list, files_removed
+
+def error_messages(file_lists):
+
+    if len(file_lists) ==0:
+        return
+
+    for remove_this,reason in file_lists:
+        file_list.remove(remove_this)
+        if reason == 0:
+            print(" REMOVED : (" + str(remove_this) +") is not PNG file format")
+        elif reason == 1:
+            print(" REMOVED : (" + str(remove_this) +") already exists")
+        elif reason == 2:
+            print(" REMOVED : (" + str(remove_this) +") file unreadable")