diff --git a/lib/Alchemy/Phrasea/Controller/Prod/Tools.php b/lib/Alchemy/Phrasea/Controller/Prod/Tools.php
index 8ce0e327bf..d8a4430715 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/Tools.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/Tools.php
@@ -200,7 +200,6 @@ class Tools implements ControllerProviderInterface
                         $success = true;
                         $message = _('Thumbnail has been successfully substitued');
                     } catch (\Exception $e) {
-                        var_dump($e->getMessage());
                         $message = _('file is not valid');
                     }
                 } else {
diff --git a/templates/web/prod/actions/Tools/index.html.twig b/templates/web/prod/actions/Tools/index.html.twig
index 320c3df3d3..cd5ad0eb41 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/tests/Alchemy/Phrasea/Controller/Prod/ToolsTest.php b/tests/Alchemy/Phrasea/Controller/Prod/ToolsTest.php
new file mode 100644
index 0000000000..5227d0fa2a
--- /dev/null
+++ b/tests/Alchemy/Phrasea/Controller/Prod/ToolsTest.php
@@ -0,0 +1,75 @@
+<?php
+
+require_once __DIR__ . '/../../../../PhraseanetWebTestCaseAuthenticatedAbstract.class.inc';
+
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+
+class ControllerToolsTest extends \PhraseanetWebTestCaseAuthenticatedAbstract
+{
+    protected $client;
+    protected $tmpFile;
+
+    public function setUp()
+    {
+        parent::setUp();
+        $this->client = $this->createClient();
+        $this->tmpFile = sys_get_temp_dir() . '/' . time() . mt_rand(1000, 9999) . '.jpg';
+        copy(__DIR__ . '/../../../../testfiles/cestlafete.jpg', $this->tmpFile);
+    }
+
+    public function tearDown()
+    {
+        if (file_exists($this->tmpFile)) {
+            unlink($this->tmpFile);
+        }
+        parent::tearDown();
+    }
+
+    public function createApplication()
+    {
+        $app = require __DIR__ . '/../../../../../lib/Alchemy/Phrasea/Application/Prod.php';
+
+        $app['debug'] = true;
+        unset($app['exception_handler']);
+
+        return $app;
+    }
+
+    public function testRouteChangeDoc()
+    {
+        $record = static::$records['record_1'];
+
+        $crawler = $this->client->request('POST', '/tools/hddoc/', array(
+            'sbas_id' => $record->get_sbas_id(),
+            'record_id' => $record->get_record_id(),
+        ), array(
+            'newHD' => new UploadedFile(
+               $this->tmpFile, 'KIKOO.JPG', 'image/jpg', 2000
+            )
+        ));
+
+        $response = $this->client->getResponse();
+        $message = trim($crawler->filterXPath('//div')->text());
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertEquals(_('Document has been successfully substitued'), $message);
+    }
+
+    public function testRouteChangeThumb()
+    {
+        $record = static::$records['record_1'];
+
+        $crawler = $this->client->request('POST', '/tools/chgthumb/', array(
+            'sbas_id' => $record->get_sbas_id(),
+            'record_id' => $record->get_record_id(),
+        ), array(
+            'newThumb' => new UploadedFile(
+               $this->tmpFile, 'KIKOO.JPG', 'image/jpg', 2000
+            )
+        ));
+
+        $response = $this->client->getResponse();
+        $message = trim($crawler->filterXPath('//div')->text());
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertEquals(_('Thumbnail has been successfully substitued'), $message);
+    }
+}
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;