diff --git a/frontends/etiquette_flask/etiquette_flask/common.py b/frontends/etiquette_flask/etiquette_flask/common.py
index 57fa35f..772056e 100644
--- a/frontends/etiquette_flask/etiquette_flask/common.py
+++ b/frontends/etiquette_flask/etiquette_flask/common.py
@@ -9,6 +9,7 @@ from voussoirkit import bytestring
 from voussoirkit import pathclass
 
 from . import caching
+from . import jinja_filters
 from . import jsonify
 from . import sessions
 
@@ -31,6 +32,7 @@ site.config.update(
 site.jinja_env.add_extension('jinja2.ext.do')
 site.jinja_env.trim_blocks = True
 site.jinja_env.lstrip_blocks = True
+site.jinja_env.filters['bytestring'] = jinja_filters.bytestring
 site.debug = True
 
 P = etiquette.photodb.PhotoDB()
diff --git a/frontends/etiquette_flask/etiquette_flask/jinja_filters.py b/frontends/etiquette_flask/etiquette_flask/jinja_filters.py
new file mode 100644
index 0000000..1f93b64
--- /dev/null
+++ b/frontends/etiquette_flask/etiquette_flask/jinja_filters.py
@@ -0,0 +1,9 @@
+import etiquette
+
+import voussoirkit.bytestring
+
+def bytestring(x):
+    try:
+        return voussoirkit.bytestring.bytestring(x)
+    except Exception:
+        return '??? b'
diff --git a/frontends/etiquette_flask/templates/album.html b/frontends/etiquette_flask/templates/album.html
index 5f52607..5f9e112 100644
--- a/frontends/etiquette_flask/templates/album.html
+++ b/frontends/etiquette_flask/templates/album.html
@@ -108,13 +108,13 @@ p
             Download:
             {% if has_local_photos %}
                 <a href="/album/{{album.id}}.zip?recursive=no">
-                    These files ({{album.sum_bytes(recurse=False, string=True)}})
+                    These files ({{album.sum_bytes(recurse=False)|bytestring }})
                 </a>
             {% endif %}
             {% if has_local_photos and has_child_photos %}&mdash;{% endif %}
             {% if has_child_photos %}
                 <a href="/album/{{album.id}}.zip?recursive=yes">
-                    Include children ({{album.sum_bytes(recurse=True, string=True)}})
+                    Include children ({{album.sum_bytes(recurse=True)|bytestring }})
                 </a>
             {% endif %}
         {% endif %}