diff --git a/sdbs_pile/pile/migrations/0004_document_hidden.py b/sdbs_pile/pile/migrations/0004_document_hidden.py
new file mode 100644
index 0000000..67c9c16
--- /dev/null
+++ b/sdbs_pile/pile/migrations/0004_document_hidden.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.0.4 on 2020-03-19 19:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pile', '0003_auto_20200318_2201'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='document',
+            name='hidden',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/sdbs_pile/pile/migrations/0005_auto_20200320_1329.py b/sdbs_pile/pile/migrations/0005_auto_20200320_1329.py
new file mode 100644
index 0000000..12f79ff
--- /dev/null
+++ b/sdbs_pile/pile/migrations/0005_auto_20200320_1329.py
@@ -0,0 +1,17 @@
+# Generated by Django 3.0.4 on 2020-03-20 12:29
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pile', '0004_document_hidden'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='document',
+            options={'ordering': ['-id'], 'permissions': [('see_hidden', 'Can see hidden documents')]},
+        ),
+    ]
diff --git a/sdbs_pile/pile/models.py b/sdbs_pile/pile/models.py
index 8074efb..9694d06 100644
--- a/sdbs_pile/pile/models.py
+++ b/sdbs_pile/pile/models.py
@@ -1,6 +1,7 @@
 from django.core.exceptions import ValidationError
 from django.core.files.storage import FileSystemStorage
 from django.db import models
+from django.db.models import Count
 from model_utils.models import SoftDeletableModel
 
 
@@ -8,10 +9,29 @@ class Tag(SoftDeletableModel):
     name = models.CharField(max_length=128, null=False, blank=False)
     description = models.TextField(null=False, blank=True)
 
+    @property
+    def documents_exclude_hidden(self):
+        return Document.exclude_hidden.filter(tags__in=[self])
+
     def __str__(self):
         return self.name
 
 
+class DocumentManager(models.Manager):
+    def __init__(self, include_hidden=True):
+        super(DocumentManager, self).__init__()
+        self._include_hidden = include_hidden
+
+    def get_queryset(self):
+        if self._include_hidden:
+            return super().get_queryset()
+        else:
+            return super().get_queryset().filter(hidden=False)
+
+    def untagged(self):
+        return self.get_queryset().annotate(tag_count=Count('tags')).filter(tag_count=0)
+
+
 class Document(SoftDeletableModel):
     title = models.CharField(max_length=512, null=False, blank=False)
     description = models.TextField(null=False, blank=True)
@@ -19,9 +39,13 @@ class Document(SoftDeletableModel):
     published = models.CharField(max_length=128, null=False, blank=True)
     external_url = models.URLField(null=True, blank=True)
     file = models.FileField(null=True, blank=True, storage=FileSystemStorage(location='docs'))
-    tags = models.ManyToManyField(Tag, related_name="documents")
+    hidden = models.BooleanField(default=False, null=False, blank=False)
+    tags = models.ManyToManyField(Tag, related_name="documents", blank=True)
     uploaded = models.DateTimeField(auto_now_add=True, null=True)
 
+    objects = DocumentManager()
+    exclude_hidden = DocumentManager(include_hidden=False)
+
     @property
     def url(self):
         if self.file:
@@ -30,6 +54,9 @@ class Document(SoftDeletableModel):
 
     class Meta:
         ordering = ['-id']
+        permissions = [
+            ("see_hidden", "Can see hidden documents")
+        ]
 
     def get_absolute_url(self):
         from django.urls import reverse
diff --git a/sdbs_pile/pile/templates/front_base.html b/sdbs_pile/pile/templates/front_base.html
index e07a33e..f7f55ea 100644
--- a/sdbs_pile/pile/templates/front_base.html
+++ b/sdbs_pile/pile/templates/front_base.html
@@ -28,12 +28,12 @@
     <div id="sidebar-taglist">
         <ul>
             <li id="sidebar-taglist-top"><a href="{% url "pile:tag" "*" %}">ALL ({{ document_count }})</a></li>
-            {% if untagged.count %}
-                <li id="sidebar-taglist-top"><a href="?tag=_">UNTAGGED ({{ untagged_count }})</a></li>
+            {% if untagged_count %}
+                <li id="sidebar-taglist-top"><a href="/tag/_">UNTAGGED ({{ untagged_count }})</a></li>
             {% endif %}
-            {% for tag in tags %}
-                {% if tag.documents.count > 0 %}
-                    <li><a href="{% url 'pile:tag' tag.id %}">{{ tag.name }} ({{ tag.documents.count }})</a></li>
+            {% for tag, tag_count in tags %}
+                {% if tag_count > 0 %}
+                    <li><a href="{% url 'pile:tag' tag.id %}">{{ tag.name }} ({{ tag_count }})</a></li>
                 {% endif %}
             {% endfor %}
         </ul>
diff --git a/sdbs_pile/pile/templates/front_doc_listing.html b/sdbs_pile/pile/templates/front_doc_listing.html
index c0abda7..ec0c70a 100644
--- a/sdbs_pile/pile/templates/front_doc_listing.html
+++ b/sdbs_pile/pile/templates/front_doc_listing.html
@@ -1,6 +1,15 @@
 {% extends "front_base.html" %}
 
-{% block title %}{% if tag %}: Filed under "{{ tag.name }}"{% else %}: All documents{% endif %}{% endblock %}
+{% block title %}{% spaceless %}
+
+    {% if tag %}
+        : Filed under "{{ tag.name }}"
+    {% elif untagged %}
+        : Untagged
+    {% else %}
+        : All documents
+    {% endif %}
+{% endspaceless %}{% endblock %}
 
 {% block content %}
     {% if tag %}
diff --git a/sdbs_pile/pile/views.py b/sdbs_pile/pile/views.py
index 33fcbaf..c639f9d 100644
--- a/sdbs_pile/pile/views.py
+++ b/sdbs_pile/pile/views.py
@@ -1,7 +1,8 @@
 # Create your views here.
+from operator import itemgetter
+
 from django.contrib.syndication.views import Feed
 from django.core.exceptions import ObjectDoesNotExist
-from django.db.models import Count
 from django.http import Http404
 from django.views.generic import TemplateView
 
@@ -9,12 +10,25 @@ from sdbs_pile.pile.models import Tag, Document
 
 
 class BasePileView(TemplateView):
+
+    @property
+    def include_hidden(self):
+        return self.request.user.has_perm('document.see_hidden')
+
+    @property
+    def documents(self):
+        return Document.objects if self.include_hidden else Document.exclude_hidden
+
     def get_context_data(self, **kwargs):
+        tags = list(Tag.objects.all())
+        tags.sort(key=lambda tag: tag.name)
+        tags = [(tag, (tag.documents if self.include_hidden else tag.documents_exclude_hidden).count()) for tag in tags]
+        tags.sort(key=itemgetter(1), reverse=True)
+
         return {
-            'tags': sorted(sorted(Tag.objects.all(), key=lambda tag: tag.name),
-                           key=lambda tag: tag.documents.count(), reverse=True),
-            'document_count': Document.objects.count(),
-            'untagged_count': Document.objects.annotate(tag_count=Count('tags')).filter(tag_count__gt=0).count()
+            'tags': tags,
+            'document_count': self.documents.count(),
+            'untagged_count': self.documents.untagged().count()
         }
 
 
@@ -25,7 +39,7 @@ class IndexView(BasePileView):
         base_context_data = super(IndexView, self).get_context_data(**kwargs)
 
         return {
-            'recent_documents': Document.objects.order_by('-uploaded')[:5],
+            'recent_documents': self.documents.order_by('-uploaded')[:5],
             **base_context_data
         }
 
@@ -38,19 +52,23 @@ class TagView(BasePileView):
 
         if name_or_id == "*":
             tag = None
-            documents = Document.objects.all()
+            documents = self.documents.all()
+        elif name_or_id == "_":
+            tag = "UNTAGGED"
+            documents = self.documents.untagged()
         else:
             try:
                 try:
                     tag = Tag.objects.get(id=int(name_or_id))
                 except ValueError:
                     tag = Tag.objects.get(name=name_or_id)
-                documents = tag.documents.all()
+                documents = tag.documents.all() if self.include_hidden else tag.documents_exclude_hidden
             except ObjectDoesNotExist:
                 raise Http404
 
         return {
-            'tag': tag,
+            'tag': tag if tag != "UNTAGGED" else None,
+            'untagged': tag == "UNTAGGED",
             'documents': documents,
             **base_context_data
         }
@@ -63,7 +81,7 @@ class DocumentView(BasePileView):
         base_context_data = super(DocumentView, self).get_context_data()
 
         try:
-            document = Document.objects.get(pk=document_id)
+            document = self.documents.get(pk=document_id)
         except ObjectDoesNotExist:
             raise Http404