diff --git a/jdav_web/locale/de/LC_MESSAGES/django.po b/jdav_web/locale/de/LC_MESSAGES/django.po
index a8bf069..3720f59 100644
--- a/jdav_web/locale/de/LC_MESSAGES/django.po
+++ b/jdav_web/locale/de/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-07-05 10:06+0000\n"
+"POT-Creation-Date: 2017-11-11 16:16+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -45,3 +45,11 @@ msgstr "Start"
 #: templates/admin/base_site.html:5 templates/admin/base_site.html:9
 msgid "JDAV LB Administration"
 msgstr "JDAV LB Verwaltung"
+
+#: utils.py:26
+msgid "Filetype not supported."
+msgstr "Dateityp nicht unterstützt."
+
+#: utils.py:28
+msgid "Please keep filesize under {}. Current filesize: {}"
+msgstr "Maximale Dateigröße {}. Aktuelle Dateigröße: {}."
diff --git a/jdav_web/mailer/models.py b/jdav_web/mailer/models.py
index f82a276..427c084 100644
--- a/jdav_web/mailer/models.py
+++ b/jdav_web/mailer/models.py
@@ -4,6 +4,7 @@ from django import forms
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext
 from .mailutils import send, get_content, SENT, PARTLY_SENT, mail_root
+from utils import RestrictedFileField
 
 import os
 
@@ -11,28 +12,6 @@ import os
 SENDING_ADDRESS = mail_root
 
 
-class RestrictedFileField(models.FileField):
-
-    def __init__(self, *args, **kwargs):
-        if "max_upload_size" in kwargs:
-            self.max_upload_size = kwargs.pop("max_upload_size")
-
-        super(RestrictedFileField, self).__init__(*args, **kwargs)
-
-    def clean(self, *args, **kwargs):
-        data = super(RestrictedFileField, self).clean(*args, **kwargs)
-        f = data.file
-        try:
-            if f._size > self.max_upload_size:
-                raise forms.ValidationError('Please keep filesize under {}. '
-                                            'Current filesize: '
-                                            '{}'.format(self.max_upload_size,
-                                                        f._size))
-        except AttributeError as e:
-            print(e)
-        return data
-
-
 # Create your models here.
 class Message(models.Model):
     """Represents a message that can be sent to some members"""
diff --git a/jdav_web/members/models.py b/jdav_web/members/models.py
index 98da325..80ec5a8 100644
--- a/jdav_web/members/models.py
+++ b/jdav_web/members/models.py
@@ -3,6 +3,7 @@ import uuid
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
+from utils import RestrictedFileField
 
 GEMEINSCHAFTS_TOUR = 0
 FUEHRUNGS_TOUR = 1
@@ -67,7 +68,14 @@ class Member(models.Model):
     comments = models.TextField(_('comments'), default='', blank=True)
     created = models.DateField(auto_now=True, verbose_name=_('created'))
     registered = models.BooleanField(default=False, verbose_name=_('Registration complete'))
-    registration_form = models.ImageField(verbose_name=_('registration form'), blank=True)
+    registration_form = RestrictedFileField(verbose_name=_('registration form'),
+                                            upload_to='registration_forms',
+                                            blank=True,
+                                            max_upload_size=5242880,
+                                            content_types=['application/pdf',
+                                                           'image/jpeg',
+                                                           'image/png',
+                                                           'image/gif'])
 
     def __str__(self):
         """String representation"""
diff --git a/jdav_web/startpage/locale/de/LC_MESSAGES/django.po b/jdav_web/startpage/locale/de/LC_MESSAGES/django.po
index 2fb98ed..d002a7d 100644
--- a/jdav_web/startpage/locale/de/LC_MESSAGES/django.po
+++ b/jdav_web/startpage/locale/de/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-01-14 17:13+0100\n"
+"POT-Creation-Date: 2017-11-11 16:16+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
diff --git a/jdav_web/utils.py b/jdav_web/utils.py
new file mode 100644
index 0000000..9408155
--- /dev/null
+++ b/jdav_web/utils.py
@@ -0,0 +1,34 @@
+from django.db import models
+from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext_lazy as _
+
+
+class RestrictedFileField(models.FileField):
+
+    def __init__(self, *args, **kwargs):
+        if "max_upload_size" in kwargs:
+            self.max_upload_size = kwargs.pop("max_upload_size")
+        else:
+            self.max_upload_size = None
+        if "content_types" in kwargs:
+            self.content_types = kwargs.pop("content_types")
+        else:
+            self.content_types = None
+
+        super(RestrictedFileField, self).__init__(*args, **kwargs)
+
+    def clean(self, *args, **kwargs):
+        data = super(RestrictedFileField, self).clean(*args, **kwargs)
+        f = data.file
+        try:
+            content_type = f.content_type
+            if self.content_types is not None and content_type not in self.content_types:
+                raise ValidationError(_('Filetype not supported.'))
+            if self.max_upload_size is not None and f._size > self.max_upload_size:
+                raise ValidationError(_('Please keep filesize under {}. '
+                                        'Current filesize: '
+                                        '{}').format(self.max_upload_size,
+                                                     f._size))
+        except AttributeError as e:
+            print(e)
+        return data