diff --git a/tests/test_widgets.py b/tests/test_widgets.py
index c85b67921..b254b1065 100644
--- a/tests/test_widgets.py
+++ b/tests/test_widgets.py
@@ -906,6 +906,19 @@ def test_wcsextrastringwidget_builtin_validation():
     assert widget.error == 'You should enter a 5-digits zip code, for example 75014.'
 
 
+def test_wcsextrastringwidget_maxlength():
+    widget = WcsExtraStringWidget('test', value='foo', required=False, maxlength=10)
+    mock_form_submission(req, widget, {'test': '123'})
+    assert not widget.has_error()
+
+    widget = WcsExtraStringWidget('test', value='foo', required=False, maxlength=10)
+    mock_form_submission(req, widget, {'test': '1234567890abcdef'})
+    assert widget.has_error()
+
+    form = MockHtmlForm(widget)
+    assert 'maxlength="10"' in form.as_html
+
+
 def test_wcsextrastringwidget_phone():
     class FakeField:
         pass
diff --git a/wcs/fields/string.py b/wcs/fields/string.py
index 5e702ec16..95d53f5f2 100644
--- a/wcs/fields/string.py
+++ b/wcs/fields/string.py
@@ -45,7 +45,8 @@ class StringField(WidgetField):
 
     widget_class = WcsExtraStringWidget
     size = None
-    extra_attributes = ['size']
+    maxlength = None
+    extra_attributes = ['size', 'maxlength']
     validation = {}
     data_source = {}
     keep_raw_value = False
@@ -85,6 +86,13 @@ class StringField(WidgetField):
             value=self.validation,
             advanced=True,
         )
+        form.add(
+            StringWidget,
+            'maxlength',
+            title=_('Maximum number of characters'),
+            value=self.maxlength,
+            advanced=True,
+        )
         form.add(
             data_sources.DataSourceSelectionWidget,
             'data_source',
@@ -97,7 +105,13 @@ class StringField(WidgetField):
         )
 
     def get_admin_attributes(self):
-        return WidgetField.get_admin_attributes(self) + ['size', 'validation', 'data_source', 'anonymise']
+        return WidgetField.get_admin_attributes(self) + [
+            'size',
+            'validation',
+            'data_source',
+            'anonymise',
+            'maxlength',
+        ]
 
     def get_view_value(self, value, **kwargs):
         value = value or ''
diff --git a/wcs/qommon/form.py b/wcs/qommon/form.py
index a9fb37ba9..e5a72f9be 100644
--- a/wcs/qommon/form.py
+++ b/wcs/qommon/form.py
@@ -646,7 +646,7 @@ class StringWidget(QuixoteStringWidget):
         QuixoteStringWidget._parse(self, request)
         if self.value:
             self.value = self.value.strip()
-            if self.maxlength and len(self.value) > self.maxlength:
+            if self.maxlength and len(self.value) > int(self.maxlength):
                 self.set_error_code('too_long')
             elif self.validation_function:
                 try:
@@ -655,7 +655,7 @@ class StringWidget(QuixoteStringWidget):
                     self.set_error(str(e))
 
     def get_too_long_message(self):
-        return _('Too long, value must be at most %d characters.') % self.maxlength
+        return _('Too long, value must be at most %d characters.') % int(self.maxlength)
 
     def get_error_message_codes(self):
         yield from super().get_error_message_codes()