diff --git a/etiquette/objects.py b/etiquette/objects.py
index cfaacfa..43d766e 100644
--- a/etiquette/objects.py
+++ b/etiquette/objects.py
@@ -1207,6 +1207,26 @@ class Tag(ObjectBase, GroupableMixin):
 
         return description
 
+    @staticmethod
+    def normalize_name(name, valid_chars=None, min_length=None, max_length=None):
+        original_name = name
+        if valid_chars is None:
+            valid_chars = constants.DEFAULT_CONFIG['tag']['valid_chars']
+
+        name = name.lower()
+        name = name.replace('-', '_')
+        name = name.replace(' ', '_')
+        name = (c for c in name if c in valid_chars)
+        name = ''.join(name)
+
+        if min_length is not None and len(name) < min_length:
+            raise exceptions.TagTooShort(original_name)
+
+        if max_length is not None and len(name) > max_length:
+            raise exceptions.TagTooLong(name)
+
+        return name
+
     def _uncache(self):
         self.photodb.caches['tag'].remove(self.id)
         self._cached_qualified_name = None
diff --git a/etiquette/photodb.py b/etiquette/photodb.py
index 1306168..a738ffa 100644
--- a/etiquette/photodb.py
+++ b/etiquette/photodb.py
@@ -892,27 +892,13 @@ class PDBTagMixin:
         return tag
 
     def normalize_tagname(self, tagname):
-        '''
-        Tag names can only consist of characters defined in the config.
-        The given tagname is lowercased, gets its spaces and hyphens
-        replaced by underscores, and is stripped of any not-whitelisted
-        characters.
-        '''
-        original_tagname = tagname
-        tagname = tagname.lower()
-        tagname = tagname.replace('-', '_')
-        tagname = tagname.replace(' ', '_')
-        tagname = (c for c in tagname if c in self.config['tag']['valid_chars'])
-        tagname = ''.join(tagname)
-
-        if len(tagname) < self.config['tag']['min_length']:
-            raise exceptions.TagTooShort(original_tagname)
-
-        elif len(tagname) > self.config['tag']['max_length']:
-            raise exceptions.TagTooLong(tagname)
-
-        else:
-            return tagname
+        tagname = objects.Tag.normalize_name(
+            tagname,
+            valid_chars=self.config['tag']['valid_chars'],
+            min_length=self.config['tag']['min_length'],
+            max_length=self.config['tag']['max_length'],
+        )
+        return tagname
 
 
 class PDBUserMixin: