diff --git a/py/converter.py b/py/converter.py
index a325fb9..8589a8e 100644
--- a/py/converter.py
+++ b/py/converter.py
@@ -43,10 +43,10 @@ def p2h(data, keymode):
 
 def h2p(data, keymode):
     if(keymode=="sk"):
-        sk = SigningKey.from_string(b16decode(data.encode()), curve=SECP256k1)
+        sk = SigningKey.from_string(b16decode(data.upper().encode()), curve=SECP256k1)
         print(sk.to_pem().decode())
     elif(keymode=="vk"):
-        vk = VerifyingKey.from_string(b16decode(data.encode()), curve=SECP256k1)
+        vk = VerifyingKey.from_string(b16decode(data.upper().encode()), curve=SECP256k1)
         print(vk.to_pem().decode())
 
 def seed2hkey(data, keymode):