diff --git a/swh/web/templates/includes/directory-display.html b/swh/web/templates/includes/directory-display.html
--- a/swh/web/templates/includes/directory-display.html
+++ b/swh/web/templates/includes/directory-display.html
@@ -46,7 +46,7 @@
               {{ f.perms }}
             </td>
             <td class="d-none d-sm-table-cell">
-              {{ f.length }}
+              {{ f.length|filesizeformat }}
             </td>
           </tr>
         {% endfor %}