diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 291b3ef525cb4c6860f94b6779202fe0da07461e..8f487b357465c01614287a9aca0cfb9c1e83935c 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -20,9 +20,28 @@ class Configuration implements ConfigurationInterface
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('irstea_file_upload');
 
-        // Here you should define the parameters that are allowed to
-        // configure your bundle. See the documentation linked above for
-        // more information on that topic.
+         $rootNode
+            ->children()
+                 ->integerNode('max_chunk_size')
+                    ->beforeNormalization()
+                        ->ifString()
+                        ->then(function($v) {
+                            $int = intval($v);
+                            if(strpos($v, "K")) {
+                                return 1000*$int;
+                            }
+                            if(strpos($v, "M")) {
+                                return 1000000*$int;
+                            }
+                            return $int;
+                        })
+                    ->end()
+                    ->defaultValue(0)
+                    ->treatNullLike(0)
+                    ->treatFalseLike(0)
+                    ->min(0)
+                 ->end()
+            ->end();
 
         return $treeBuilder;
     }
diff --git a/DependencyInjection/IrsteaFileUploadExtension.php b/DependencyInjection/IrsteaFileUploadExtension.php
index d3f8b862c7b3905800706e3898cefdca46c853eb..248bdc2d6731a29aa3e77d1904062a529a75f8d6 100644
--- a/DependencyInjection/IrsteaFileUploadExtension.php
+++ b/DependencyInjection/IrsteaFileUploadExtension.php
@@ -20,6 +20,8 @@ class IrsteaFileUploadExtension extends Extension implements PrependExtensionInt
 
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
+
+        $container->setParameter('irstea_file_upload.max_chunk_size', $config['max_chunk_size']);
     }
 
     /**
diff --git a/Form/Type/FileUploadType.php b/Form/Type/FileUploadType.php
index b4e0799cd8c492b13e139fd3b19aaf0b1f2870b2..d8a52259a07bbb1fe7a16074ba1c96b8c50ccf59 100644
--- a/Form/Type/FileUploadType.php
+++ b/Form/Type/FileUploadType.php
@@ -23,13 +23,11 @@ class FileUploadType extends AbstractType
     use \Irstea\ThemeBundle\Form\AbstractJQueryWidgetTrait;
 
     /**
-     *
      * @var Router
      */
     private $router;
 
     /**
-     *
      * @var FileManagerInterface
      */
     private $fileManager;
@@ -37,18 +35,24 @@ class FileUploadType extends AbstractType
     /**
      * @var CsrfProviderInterface
      */
-    protected $csrfProvider;
+    private $csrfProvider;
+
+    /**
+     * @var int
+     */
+    private $maxChunkSize;
 
     /**
      *
      * @param Router $router
      * @param FileManagerInterface $fileManager
      */
-    public function __construct(Router $router, FileManagerInterface $fileManager, CsrfProviderInterface $csrfProvider)
+    public function __construct(Router $router, FileManagerInterface $fileManager, CsrfProviderInterface $csrfProvider, $maxChunkSize)
     {
         $this->router = $router;
         $this->fileManager = $fileManager;
         $this->csrfProvider = $csrfProvider;
+        $this->maxChunkSize = $maxChunkSize;
     }
 
     public function buildForm(FormBuilderInterface $builder, array $options)
@@ -64,6 +68,16 @@ class FileUploadType extends AbstractType
         $view->vars['widget_attr']['data-create-url'] = $this->router->generate('file_upload_create');
         $view->vars['csrfToken'] = $this->csrfProvider->generateCsrfToken(UploadController::CSRF_INTENTION);
         $view->vars['multiple'] = $options['multiple'];
+        if($options['max_chunk_size'] > 0) {
+            $view->vars['widget_attr']['data-max-chunk-size'] = $options['max_chunk_size'];
+        }
+    }
+
+    public function setDefaultOptions(OptionsResolverInterface $resolver)
+    {
+        $this->setWidgetDefaultOptions($resolver);
+        $resolver->setDefaults(['max_chunk_size' => $this->maxChunkSize ?: 0]);
+        $resolver->setAllowedTypes(['max_chunk_size' => 'int']);
     }
 
     protected function getWidgetDefaults()
@@ -77,7 +91,6 @@ class FileUploadType extends AbstractType
             'bitrate_interval'     => 512,
             'progress_interval'    => 100,
             'recalculate_progress' => true,
-            'max_chunk_size'       => 1000000,
             'sequential_uploads'   => false,
         ];
     }
diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index ba76ea515941f40b4ea6a1e93b512b257c99694e..14b63a7084162e1b112188dc80d4041319c50d0d 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -7,6 +7,8 @@ parameters:
 
     irstea_file_upload.filesystem.name: irstea_file_upload
 
+    irstea_file_upload.max_chunk_size: 0
+
 services:
 
     # Le gestionnaire de fichiers
@@ -37,6 +39,7 @@ services:
             - @router
             - @irstea_file_upload.file_manager
             - @form.csrf_provider
+            - %irstea_file_upload.max_chunk_size%
         tags:
             - { name: form.type, alias: file_upload }
 
diff --git a/Resources/js/widget/file_upload.js b/Resources/js/widget/file_upload.js
index ba1795a3ab8f2e7d8b3cb7abfccd6a9a63a02fcd..19d428eafb697ddd9971a918fc9608e1f2c34bd0 100644
--- a/Resources/js/widget/file_upload.js
+++ b/Resources/js/widget/file_upload.js
@@ -23,7 +23,6 @@
 
         if(options.acceptFileTypes) {
             options.acceptFileTypes = new RegExp('^' + options.acceptFileTypes + '$');
-            console.debug(options.acceptFileTypes);
         }
 
         var formatSize = function(size) {
@@ -64,7 +63,6 @@
                 uploadTemplateId: null,
                 downloadTemplateId: null,
                 filesContainer: $this.find('.fileinput-entries'),
-                maxChunkSize: options.maxChunkSize || 1000000,
                 uploadTemplate: function(data) {
                     var rows = $();
                     $.each(data.files, function (index, file) {