diff --git a/src/django_resumable_async_upload/templates/admin_resumable/admin_file_input.html b/src/django_resumable_async_upload/templates/admin_resumable/admin_file_input.html
index c01806b..aa8fd4e 100644
--- a/src/django_resumable_async_upload/templates/admin_resumable/admin_file_input.html
+++ b/src/django_resumable_async_upload/templates/admin_resumable/admin_file_input.html
@@ -209,7 +209,7 @@
                 var fileType = file.file.type;
                 if (fileType && fileType.startsWith('image/') && {{ show_thumb|yesno:"true,false" }} && {% if MEDIA_URL %}true{% else %}false{% endif %} ) {
                     var imageUrl = '{{ MEDIA_URL|escapejs }}' + message;
-                    var imgHtml = '<img src="' + imageUrl + '" class="thumbnail " />';
+                    var imgHtml = '<img src="' + imageUrl + '" class="thumbnail" style="max-width: 300px; max-height: 300px;" />';
                     $('#' + fileId + '_preview').html(imgHtml);
                 }
             }