Snippet: Restrict Mime Types on WordPress Media Upload

Add following snippet to “functions.php”


add_filter( 'upload_mimes', 'restrict_mime_types_func' );
add_action( 'post-upload-ui', 'restrict_mime_types_hint_func' );
function fb_restrict_mime_types( $mime_types ) {
    $mime_types = array(
        'pdf' => 'application/pdf',
        'doc|docx' => 'application/msword',

    return $mime_types;
function fb_restrict_mime_types_hint() {
    echo '<br />';
    _e( 'Accepted MIME types: PDF, DOC/DOCX' );

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