[](http://www.uploadify.com) # fileExt Input Type:**string** Input Format:**'*.ext;*.ext;*.ext;...'** Default:**null (all files allowed)** Required:**optional** The **fileExt** options allows you to limit uploads to the specified file types. This feature can be easily bypassed so it is *highly recommended* that you validate uploaded file types in the back-end script. This option only limits what files are listed in the file selection system window. The **fileDesc** option is required when using the **fileExt** option. ### Demo Javascript Code 1. $('#file_upload').uploadify({ 1.   'uploader'    : '/uploadify/uploadify.swf', 1.   'script'      : '/uploadify/uploadify.php', 1.   'cancelImg'   : '/uploadify/cancel.png', 1.   'folder'      : '/uploads', 1.   'fileExt'     : '*.jpg;*.gif;*.png', 1.   'fileDesc'    : 'Image Files' 1. }); HTML Code 1. <inputtype="file"id="file_upload"name="file_upload"/> 1. <ahref="javascript:$('#file_upload').uploadifyUpload();">Upload Files</a> [Upload Files](#) [](#) Help keep Uploadify free and support the development of other excellent apps!  [home](#)  |  [about](#)  |  [download](#)  |  [demos](#)  |  [documentation](#)  |  [faqs](#)  |  [forums](#) ©2011 by [Reactive Apps](http://www.reactiveapps.com)