diff --git a/templates/web/prod/actions/Tools/index.html.twig b/templates/web/prod/actions/Tools/index.html.twig
index 596b970eda..4778e3430e 100644
--- a/templates/web/prod/actions/Tools/index.html.twig
+++ b/templates/web/prod/actions/Tools/index.html.twig
@@ -131,7 +131,7 @@
               {% set height = record.get_technical_infos(dataH) %}
 
               {% if width and height %}
-                {% set ratio = width / height %}
+                {% set ratio = (width / height)|number_format(2, '.') %}
               {% else %}
                  {% set ratio = '' %}
               {% endif %}
diff --git a/www/prod/ThumbExtractor.js b/www/prod/ThumbExtractor.js
index c4bbd77c3b..b235aa51cd 100644
--- a/www/prod/ThumbExtractor.js
+++ b/www/prod/ThumbExtractor.js
@@ -14,11 +14,13 @@
       var maxH = elementDomNode.getHeight();
 
       if ('' !== elementDomNode.getAspectRatio()) {
-        var h = Math.round(w * (1 / elementDomNode.getAspectRatio()));
+        var ratio = parseFloat(elementDomNode.getAspectRatio());
+
+        var h = Math.round(w * (1 / ratio));
 
         if (h > maxH) {
             var h = maxH;
-            var w =  Math.round(h * elementDomNode.getAspectRatio());
+            var w =  Math.round(h * ratio);
         }
       } else {
           var h = maxH;