diff --git a/to_wif.py b/to_wif.py
index 7597a30..4bfbed7 100644
--- a/to_wif.py
+++ b/to_wif.py
@@ -2,9 +2,20 @@
 Module for converting batch bitcoin private keys to WIF (Compressed & Uncompressed).
 """
 
+import binascii
 from src.conversion_utils import convert_hex_to_wif
 from src.common import process_file
 
+def is_valid_hex_key(hex_key):
+    """
+    Validate if the given string is a valid hexadecimal.
+    """
+    try:
+        int(hex_key, 16)
+        return True
+    except ValueError:
+        return False
+
 def convert_compressed(hex_private_key):
     """
     Convert a hexadecimal private key to Wallet Import Format (WIF) for compressed addresses.
@@ -28,14 +39,16 @@ def process_both_conversions(hex_private_key):
     Args:
         hex_private_key (str): The hexadecimal private key to be converted.
     """
-    convert_compressed(hex_private_key)
-    convert_uncompressed(hex_private_key)
+    if is_valid_hex_key(hex_private_key):
+        convert_compressed(hex_private_key)
+        convert_uncompressed(hex_private_key)
+    else:
+        print(f"Invalid hexadecimal key: {hex_private_key}")
 
 # Call common.py to process the file with both conversion functions
 process_file("hex_input.txt", process_both_conversions)
 
-print("Conversion successful. Check your 'compressed_output.txt' and "
-      "'uncompressed_output.txt' files for the converted keys.")
+print("Conversion process completed. Check 'compressed_output.txt' and 'uncompressed_output.txt' files for the converted keys.")
 print("__________________________________________________")
 print("Developed by: Fahd El Haraka")
 print("If this saved you time or helped, donations please for BTC Address:")