diff --git a/file_entity.module b/file_entity.module
index 36f8283..881a2cf 100644
--- a/file_entity.module
+++ b/file_entity.module
@@ -2455,6 +2455,21 @@ function file_entity_match_mimetypes($needle, $haystack) {
 }
 
 /**
+ * Convert an array of extensions to MIME types.
+ */
+function file_entity_get_mimetypes_from_extensions(array $extensions) {
+  include_once DRUPAL_ROOT . '/includes/file.mimetypes.inc';
+  $mapping = file_mimetype_mapping();
+  $mimetypes = array();
+  foreach ($extensions as $extension) {
+    if (isset($mapping['extensions'][$extension])) {
+      $mimetypes[] = $mapping['mimetypes'][$mapping['extensions'][$extension]];
+    }
+  }
+  return array_unique($mimetypes);
+}
+
+/**
  * A wrapper function for the PHP function fnmatch().
  *
  * We include this, because Windows servers do not implement fnmatch() until
@@ -2600,3 +2615,24 @@ function file_entity_features_pipe_file_type_alter(&$pipe, $data, $export) {
     $pipe['variable'][] = "pathauto_file_{$file_type}_pattern";
   }
 }
+
+/**
+ * Implements hook_element_info_alter().
+ */
+function file_entity_element_info_alter(&$info) {
+  $info['managed_file']['#process'][] = 'file_entity_managed_file_process_accept_attribute';
+}
+
+/**
+ * Element process for managed_file to add 'accept' attributes for allowed extensions.
+ *
+ * Add the allowed extensions as an 'accept' attribute to the file_managed element.
+ */
+function file_entity_managed_file_process_accept_attribute($element, &$form_state, $form) {
+  if (!empty($element['#upload_validators']['file_validate_extensions']) && !isset($element['upload']['#attributes']['accept'])) {
+    $extensions = explode(' ', $element['#upload_validators']['file_validate_extensions'][0]);
+    $element['upload']['#attributes']['accept'] = '.' . implode(',.', $extensions);
+  }
+
+  return $element;
+}
diff --git a/file_entity.test b/file_entity.test
index 085ced5..37fa2b8 100644
--- a/file_entity.test
+++ b/file_entity.test
@@ -298,6 +298,21 @@ class FileEntityUnitTestCase extends FileEntityTestHelper {
     file_delete($file, TRUE);
     $this->assertFalse(db_query('SELECT COUNT(*) FROM {file_metadata} WHERE fid = :fid', array(':fid' => 'fid'))->fetchField(), 'Row deleted in {file_metadata} on file_delete().');
   }
+
+  /**
+   * Test file_entity_get_mimetypes_from_extensions().
+   */
+  function testGetMimetypesFromExtensions() {
+    $tests = array();
+    $tests[] = array(
+      'extensions' => array('png', 'jpg', 'jpeg', 'gif'),
+      'mimetypes' => array('image/png', 'image/jpeg', 'image/gif'),
+    );
+    foreach ($tests as $test) {
+      $result = file_entity_get_mimetypes_from_extensions($test['extensions']);
+      $this->assertEqual($test['mimetypes'], $result);
+    }
+  }
 }
 
 /**