diff --git a/jssg/jinja2.py b/jssg/jinja2.py
index 12bb07c..40f9bc7 100644
--- a/jssg/jinja2.py
+++ b/jssg/jinja2.py
@@ -5,91 +5,12 @@
 from django.core.management.base import BaseCommand
 
 from jssg.templatetags.filter_opengraph_metadata import filter_opengraph_metadata
-
-from jssg.models import Page
+from jssg.templatetags.functions_url import url_for_slug, url_for_slug_path
 
 from django.conf import settings
 
 import importlib
 
-import re
-
-def url_for_slug(slug) :
-    """
-    @param slug: the slug of the page to search
-    @return: the string of the url corresponding to the page
-    @error: raise an exception if the slug does not exist or it is not unique (eg same slug found in several folders)
-
-    >>> url_for_slug('index') # the slug exists and is unique
-    /en/index.html
-
-    >>> url_for_slug('index-duplicated') # the slug exists in several pages
-    Traceback (most recent call last):
-      ...
-    Exception: slug 'index-duplicated' is not unique, found in : [pages/fr-index.md, pages/en-index.md] ; use url_for_slug_path()
-
-    >>> url_for_slug('index-removed') # the slug does not exists
-    Traceback (most recent call last):
-      ...
-    Exception: slug 'index-removed' not found
-
-    """
-
-    url = ""
-    pages_with_slug = []
-
-    for page in Page.load_glob(all=True) :
-        if page.slug == slug : # the page exists
-            if pages_with_slug == [] : # the slug has not been found yet
-                if page.rel_folder_path != '' :
-                    url = "/" + page.rel_folder_path + "/" + page.slug + ".html"
-                else :
-                    url = "/" + page.slug + ".html"
-            else : # the slug already exists
-                url = ""
-            pages_with_slug.append(str(page.path.relative_to(page.content_page_dir.parent)))
-
-    if url == "" and pages_with_slug != [] :
-        raise Exception("slug '%s' is not unique, found in : [%s] ; use url_for_slug_path()" % (slug, ", ".join(pages_with_slug)))
-    elif url == "" :
-        raise Exception("slug '%s' not found" % slug)
-    return url
-
-def url_for_slug_path(url_path) :
-    """
-    @param url_path: the url of the page to search (absolute path)
-    @return: the string of the slug url corresponding to the page
-    @error: raise an exception if the url is a dead link
-
-    >>> url_for_slug_path('/en/index') # the page exists
-    /en/index.html
-
-    >>> url_for_slug_path('/en/index-removed') # the page does not exist
-    Traceback (most recent call last):
-    ...
-    Exception: page for '/en/index-removed' url not found (dead link)
-
-    >>> url_for_slug_path('folder/index')
-    Traceback (most recent call last):
-      ...
-    Exception: url 'folder/index' is not valid ; correct urls are /<dir>/<slug> or /<slug>
-
-    """
-    # Valid url are /<dir>/<slug>.html or /<slug>.html
-    # Example: if url_path is "/tmp/folder/subfolder/thefile.html", then slug will be "thefile" and the dir will be "tmp/folder/subfolder"
-    # Note : the dir does not start with '/' since the url parsed in url.py do not either
-    try :
-        _, dir, slug = re.findall(r"(^|^/([a-zA-Z0-9/-]+))/([a-zA-Z0-9-]+)$", url_path)[0]
-    except :
-        raise Exception("url '%s' is not valid ; correct urls are /<dir>/<slug> or /<slug>" % url_path)
-
-    # Verify that the page exists
-    for page in Page.load_glob(all=True) :
-        if page.slug == slug and page.rel_folder_path == dir :
-            return url_path + ".html"
-
-    raise Exception("page for '%s' url not found (dead link)" % url_path)
-
 def environment(**options):
     env = Environment(**options)
     env.globals.update(
diff --git a/jssg/templatetags/functions_url.py b/jssg/templatetags/functions_url.py
new file mode 100644
index 0000000..9ab5d1f
--- /dev/null
+++ b/jssg/templatetags/functions_url.py
@@ -0,0 +1,78 @@
+import re
+from jssg.models import Page
+
+def url_for_slug(slug) :
+    """
+    @param slug: the slug of the page to search
+    @return: the string of the url corresponding to the page
+    @error: raise an exception if the slug does not exist or it is not unique (eg same slug found in several folders)
+
+    >>> url_for_slug('index') # the slug exists and is unique
+    /en/index.html
+
+    >>> url_for_slug('index-duplicated') # the slug exists in several pages
+    Traceback (most recent call last):
+      ...
+    Exception: slug 'index-duplicated' is not unique, found in : [pages/fr-index.md, pages/en-index.md] ; use url_for_slug_path()
+
+    >>> url_for_slug('index-removed') # the slug does not exists
+    Traceback (most recent call last):
+      ...
+    Exception: slug 'index-removed' not found
+
+    """
+
+    url = ""
+    pages_with_slug = []
+
+    for page in Page.load_glob(all=True) :
+        if page.slug == slug : # the page exists
+            if pages_with_slug == [] : # the slug has not been found yet
+                if page.rel_folder_path != '' :
+                    url = "/" + page.rel_folder_path + "/" + page.slug + ".html"
+                else :
+                    url = "/" + page.slug + ".html"
+            else : # the slug already exists
+                url = ""
+            pages_with_slug.append(str(page.path.relative_to(page.content_page_dir.parent)))
+
+    if url == "" and pages_with_slug != [] :
+        raise Exception("slug '%s' is not unique, found in : [%s] ; use url_for_slug_path()" % (slug, ", ".join(pages_with_slug)))
+    elif url == "" :
+        raise Exception("slug '%s' not found" % slug)
+    return url
+
+def url_for_slug_path(url_path) :
+    """
+    @param url_path: the url of the page to search (absolute path)
+    @return: the string of the slug url corresponding to the page
+    @error: raise an exception if the url is a dead link
+
+    >>> url_for_slug_path('/en/index') # the page exists
+    /en/index.html
+
+    >>> url_for_slug_path('/en/index-removed') # the page does not exist
+    Traceback (most recent call last):
+    ...
+    Exception: page for '/en/index-removed' url not found (dead link)
+
+    >>> url_for_slug_path('folder/index')
+    Traceback (most recent call last):
+      ...
+    Exception: url 'folder/index' is not valid ; correct urls are /<dir>/<slug> or /<slug>
+
+    """
+    # Valid url are /<dir>/<slug>.html or /<slug>.html
+    # Example: if url_path is "/tmp/folder/subfolder/thefile.html", then slug will be "thefile" and the dir will be "tmp/folder/subfolder"
+    # Note : the dir does not start with '/' since the url parsed in url.py do not either
+    try :
+        _, dir, slug = re.findall(r"(^|^/([a-zA-Z0-9/-]+))/([a-zA-Z0-9-]+)$", url_path)[0]
+    except :
+        raise Exception("url '%s' is not valid ; correct urls are /<dir>/<slug> or /<slug>" % url_path)
+
+    # Verify that the page exists
+    for page in Page.load_glob(all=True) :
+        if page.slug == slug and page.rel_folder_path == dir :
+            return url_path + ".html"
+
+    raise Exception("page for '%s' url not found (dead link)" % url_path)
\ No newline at end of file