diff --git a/ebook_converter/polyglot/binary.py b/ebook_converter/polyglot/binary.py
index 1bca5cd..312d45d 100644
--- a/ebook_converter/polyglot/binary.py
+++ b/ebook_converter/polyglot/binary.py
@@ -2,24 +2,12 @@ from base64 import standard_b64decode, standard_b64encode
 from binascii import hexlify, unhexlify
 
 
-def as_base64_bytes(x, enc='utf-8'):
-    if isinstance(x, str):
-        x = x.encode(enc)
-    return standard_b64encode(x)
-
-
 def as_base64_unicode(x, enc='utf-8'):
     if isinstance(x, str):
         x = x.encode(enc)
     return standard_b64encode(x).decode('ascii')
 
 
-def from_base64_unicode(x, enc='utf-8'):
-    if isinstance(x, str):
-        x = x.encode('ascii')
-    return standard_b64decode(x).decode(enc)
-
-
 def from_base64_bytes(x):
     if isinstance(x, str):
         x = x.encode('ascii')
@@ -32,18 +20,6 @@ def as_hex_bytes(x, enc='utf-8'):
     return hexlify(x)
 
 
-def as_hex_unicode(x, enc='utf-8'):
-    if isinstance(x, str):
-        x = x.encode(enc)
-    return hexlify(x).decode('ascii')
-
-
-def from_hex_unicode(x, enc='utf-8'):
-    if isinstance(x, str):
-        x = x.encode('ascii')
-    return unhexlify(x).decode(enc)
-
-
 def from_hex_bytes(x):
     if isinstance(x, str):
         x = x.encode('ascii')