diff --git a/plinth/modules/sso/forms.py b/plinth/modules/sso/forms.py
index 3c9dd9968..e490bfbd1 100644
--- a/plinth/modules/sso/forms.py
+++ b/plinth/modules/sso/forms.py
@@ -24,9 +24,17 @@ from django.contrib.auth.forms import \
 
 
 class AuthenticationForm(DjangoAuthenticationForm):
-    """Authentication form with an additional Captcha field."""
-    captcha = CaptchaField()
+    """Authentication form with an additional username field attributes."""
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields['username'].widget.attrs.update({'autofocus': 'autofocus'})
+        self.fields['username'].widget.attrs.update({
+            'autofocus': 'autofocus',
+            'autocapitalize': 'none',
+            'autocomplete': 'username'
+        })
+
+
+class CaptchaAuthenticationForm(AuthenticationForm):
+    """Authentication form with an additional Captcha field."""
+    captcha = CaptchaField()
diff --git a/plinth/modules/sso/views.py b/plinth/modules/sso/views.py
index 7991a0581..dda518f9b 100644
--- a/plinth/modules/sso/views.py
+++ b/plinth/modules/sso/views.py
@@ -27,10 +27,9 @@ from axes.decorators import axes_form_invalid
 from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.contrib.auth.views import LoginView, LogoutView
 from django.http import HttpResponseRedirect
-
 from plinth import actions, utils, web_framework
 
-from .forms import AuthenticationForm
+from .forms import AuthenticationForm, CaptchaAuthenticationForm
 
 PRIVATE_KEY_FILE_NAME = 'privkey.pem'
 SSO_COOKIE_NAME = 'auth_pubtkt'
@@ -61,6 +60,7 @@ class SSOLoginView(LoginView):
     """
     redirect_authenticated_user = True
     template_name = 'login.html'
+    form_class = AuthenticationForm
 
     def dispatch(self, request, *args, **kwargs):
         response = super(SSOLoginView, self).dispatch(request, *args, **kwargs)
@@ -79,11 +79,11 @@ class SSOLoginView(LoginView):
 class CaptchaLoginView(LoginView):
     redirect_authenticated_user = True
     template_name = 'login.html'
-    form_class = AuthenticationForm
+    form_class = CaptchaAuthenticationForm
 
     def dispatch(self, request, *args, **kwargs):
-        response = super(CaptchaLoginView,
-                         self).dispatch(request, *args, **kwargs)
+        response = super(CaptchaLoginView, self).dispatch(
+            request, *args, **kwargs)
         if not request.POST:
             return response
 
diff --git a/plinth/modules/users/forms.py b/plinth/modules/users/forms.py
index 1c13f497f..874ccb526 100644
--- a/plinth/modules/users/forms.py
+++ b/plinth/modules/users/forms.py
@@ -125,7 +125,11 @@ class CreateUserForm(ValidNewUsernameCheckMixin,
         self.request = request
         super(CreateUserForm, self).__init__(*args, **kwargs)
         self.fields['groups'].choices = get_group_choices()
-        self.fields['username'].widget.attrs.update({'autofocus': 'autofocus'})
+        self.fields['username'].widget.attrs.update({
+            'autofocus': 'autofocus',
+            'autocapitalize': 'none',
+            'autocomplete': 'username'
+        })
 
     def save(self, commit=True):
         """Save the user model and create LDAP user if required."""
@@ -194,7 +198,11 @@ class UserUpdateForm(ValidNewUsernameCheckMixin,
         self.username = username
         super(UserUpdateForm, self).__init__(*args, **kwargs)
         self.is_last_admin_user = get_last_admin_user() == self.username
-        self.fields['username'].widget.attrs.update({'autofocus': 'autofocus'})
+        self.fields['username'].widget.attrs.update({
+            'autofocus': 'autofocus',
+            'autocapitalize': 'none',
+            'autocomplete': 'username'
+        })
 
         choices = []