diff --git a/epdb/templatetags/templatetags.py b/epdb/templatetags/templatetags.py
new file mode 100644
index 00000000..6c250e63
--- /dev/null
+++ b/epdb/templatetags/templatetags.py
@@ -0,0 +1,21 @@
+from django import template
+from pydantic import AnyHttpUrl, ValidationError
+from pydantic.type_adapter import TypeAdapter
+
+register = template.Library()
+
+url_adapter = TypeAdapter(AnyHttpUrl)
+
+
+@register.filter
+def classname(obj):
+    return obj.__class__.__name__
+
+
+@register.filter
+def is_url(value):
+    try:
+        url_adapter.validate_python(value)
+        return True
+    except ValidationError:
+        return False