diff --git a/opds_catalog/feeds.py b/opds_catalog/feeds.py
index 72d03c129ad73b32a21dfdde848df9ef7df0abe8..d313afd08d08f165ad5481d5ff893665867fb222 100644
--- a/opds_catalog/feeds.py
+++ b/opds_catalog/feeds.py
@@ -293,12 +293,19 @@ class CatalogsFeed(AuthFeed):
         if item['is_catalog']:
             return (opdsEnclosure(reverse("opds_catalog:cat_tree", kwargs={"cat_id":item['id']}),"application/atom+xml;profile=opds-catalog;kind=navigation", "subsection"),)
         else:
-            return (
+            enclosure = [
                 opdsEnclosure(reverse("opds_catalog:download", kwargs={"book_id":item['id'],"zip_flag":0}),"application/%s"%item['format'] ,"http://opds-spec.org/acquisition/open-access"),
                 opdsEnclosure(reverse("opds_catalog:download", kwargs={"book_id":item['id'],"zip_flag":1}),"application/%s+zip"%item['format'], "http://opds-spec.org/acquisition/open-access"),
                 opdsEnclosure(reverse("opds_catalog:cover", kwargs={"book_id":item['id']}),"image/jpeg", "http://opds-spec.org/image"),
                 opdsEnclosure(reverse("opds_catalog:thumb", kwargs={"book_id": item['id']}), "image/jpeg","http://opds-spec.org/thumbnail"),
-            )
+
+            ]
+            if (config.SOPDS_FB2TOEPUB!="") and (item['format']=='fb2'):
+                enclosure += [opdsEnclosure(reverse("opds_catalog:convert", kwargs={"book_id":item['id'],"convert_type":"epub"}),"application/epub+zip","http://opds-spec.org/acquisition/open-access")]
+            if (config.SOPDS_FB2TOMOBI!="") and (item['format']=='fb2'):
+                enclosure += [opdsEnclosure(reverse("opds_catalog:convert", kwargs={"book_id":item['id'],"convert_type":"mobi"}),"application/mobi","http://opds-spec.org/acquisition/open-access")]
+
+            return enclosure
     
     def item_description(self, item):
         if item['is_catalog']:
diff --git a/opds_catalog/settings.py b/opds_catalog/settings.py
index d9660d8e632e5c685fac1d2ecfd729c1c9ad3e0a..758d4f01d997ab3df199f2fbaab8d1742799fb1f 100644
--- a/opds_catalog/settings.py
+++ b/opds_catalog/settings.py
@@ -5,6 +5,7 @@ from django.utils import translation
 from constance import config
 
 loglevels={'debug':logging.DEBUG,'info':logging.INFO,'warning':logging.WARNING,'error':logging.ERROR,'critical':logging.CRITICAL,'none':logging.NOTSET}
+NOZIP_FORMATS = ['epub', 'mobi']
 
 VERSION = "0.42-dev"
 TITLE = getattr(settings, "SOPDS_TITLE", "SimpleOPDS")
diff --git a/sopds_web_backend/templates/sopds_books.html b/sopds_web_backend/templates/sopds_books.html
index 35d75bc52b5217194316b64a0de48375bd108fce..1c7f01ba5c99890873255349a1abbde354dcb841 100644
--- a/sopds_web_backend/templates/sopds_books.html
+++ b/sopds_web_backend/templates/sopds_books.html
@@ -48,7 +48,9 @@
 			<b>{{ b.title }}</b>
 			<i style="font-size:80%;">{% trans "Download:" %} </i>
 			<i><a href="{% url 'opds_catalog:download' b.id 0 %}"><span class="label small">{{b.format}}</span></a></i>&nbsp;
-			<i><a href="{% url 'opds_catalog:download' b.id 1 %}"><span class="label small">{{b.format}}+zip</span></a></i>&nbsp;
+            {% if not b.format in nozip %}
+                <i><a href="{% url 'opds_catalog:download' b.id 1 %}"><span class="label small">{{b.format}}+zip</span></a></i>&nbsp;
+            {%  endif %}
 			{% if b.format == 'fb2' and fb2toepub %}
 			   <i><a href="{% url 'opds_catalog:convert' b.id 'epub' %}"><span class="label small">epub</span></a></i>&nbsp;
 			{% endif %}
diff --git a/sopds_web_backend/views.py b/sopds_web_backend/views.py
index 08743dc0e11d8d12a3ef9adfcfa6b1f928a123d2..d1d17f9643dda242bd5916a164933b31a3423b35 100644
--- a/sopds_web_backend/views.py
+++ b/sopds_web_backend/views.py
@@ -35,6 +35,8 @@ def sopds_processor(request):
     args['splititems'] = config.SOPDS_SPLITITEMS
     args['fb2tomobi'] = (config.SOPDS_FB2TOMOBI!="")
     args['fb2toepub'] = (config.SOPDS_FB2TOEPUB!="")
+    args['nozip'] = settings.NOZIP_FORMATS
+
     if config.SOPDS_ALPHABET_MENU:
         args['lang_menu'] = lang_menu