diff --git a/CHANGELOG b/CHANGELOG
index e09109d2b..c8c60ea6b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -263,6 +263,7 @@
 - rest api returns error msg and not just http status
 - comment of document, documentcontent and folder can be rendered as
   markdown
+- fix preview for file in drop folder
 
 --------------------------------------------------------------------------------
                      Changes in version 5.1.30
diff --git a/doc/README.Converters b/doc/README.Converters
index 034358ccf..71e701b6a 100644
--- a/doc/README.Converters
+++ b/doc/README.Converters
@@ -55,6 +55,9 @@ image/jpg
 image/jpeg
   convert -density 300 '%f' 'pdf:%o'
 
+image/svg+xml
+	cairosvg -f pdf -o '%o' '%f'
+
 application/vnd.ms-powerpoint
 application/vnd.openxmlformats-officedocument.presentationml.presentation
 application/vnd.oasis.opendocument.presentation
@@ -93,6 +96,9 @@ image/jpeg
 image/png
   convert -resize %wx '%f' 'png:%o'
 
+image/svg+xml
+	cairosvg -f png --output-width %w -o '%o' '%f'
+
 text/plain
   convert -density 100 -resize %wx 'text:%f[0]' 'png:%o'
 
diff --git a/op/op.DropFolderPreview.php b/op/op.DropFolderPreview.php
index b70d01e6a..d6f88a71d 100644
--- a/op/op.DropFolderPreview.php
+++ b/op/op.DropFolderPreview.php
@@ -34,27 +34,24 @@ if (!isset($_GET["filename"])) {
 }
 $filename = $_GET["filename"];
 
-if(substr($settings->_dropFolderDir, -1, 1) == DIRECTORY_SEPARATOR)
-	$dropfolderdir = substr($settings->_dropFolderDir, 0, -1);
-else
-	$dropfolderdir = $settings->_dropFolderDir;
-$dir = $dropfolderdir.'/'.$user->getLogin();
+$dir = rtrim($settings->_dropFolderDir, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR.$user->getLogin();
 
-if(!file_exists($dir.'/'.$filename))
+if(!file_exists($dir.DIRECTORY_SEPARATOR.$filename))
 	exit;
 
 $finfo = finfo_open(FILEINFO_MIME_TYPE);
 $mimetype = finfo_file($finfo, $dir.'/'.$filename);
 
 if(!empty($_GET["width"]))
-	$previewer = new SeedDMS_Preview_Previewer($settings->_cacheDir, $_GET["width"]);
+	$previewer = new SeedDMS_Preview_Previewer($settings->_cacheDir, $_GET["width"], $settings->_cmdTimeout, $settings->_enableXsendfile);
 else
-	$previewer = new SeedDMS_Preview_Previewer($settings->_cacheDir);
-$previewer->setConverters($settings->_converters['preview']);
-$previewer->setXsendfile($settings->_enableXsendfile);
+	$previewer = new SeedDMS_Preview_Previewer($settings->_cacheDir, $settings->_previewWidthList, $settings->_cmdTimeout, $settings->_enableXsendfile);
+if($conversionmgr)
+	$previewer->setConversionMgr($conversionmgr);
+else
+	$previewer->setConverters($previewconverters);
 if(!$previewer->hasRawPreview($dir.'/'.$filename, 'dropfolder/'))
 	$previewer->createRawPreview($dir.'/'.$filename, 'dropfolder/', $mimetype);
 header('Content-Type: image/png');
 $previewer->getRawPreview($dir.'/'.$filename, 'dropfolder/');
 
-?>
diff --git a/out/out.DropFolderChooser.php b/out/out.DropFolderChooser.php
index 112892928..f7bbef11f 100644
--- a/out/out.DropFolderChooser.php
+++ b/out/out.DropFolderChooser.php
@@ -57,9 +57,11 @@ if($view) {
 	$view->setParam('dropfolderdir', $dropfolderdir);
 	$view->setParam('dropfolderfile', isset($_GET["dropfolderfile"]) ? $_GET["dropfolderfile"] : '');
 	$view->setParam('form', $form);
+	$view->setParam('conversionmgr', $conversionmgr);
 	$view->setParam('cachedir', $settings->_cacheDir);
 	$view->setParam('previewWidthMenuList', $settings->_previewWidthMenuList);
 	$view->setParam('previewWidthList', $settings->_previewWidthDropFolderList);
+	$view->setParam('previewConverters', isset($settings->_converters['preview']) ? $settings->_converters['preview'] : array());
 	$view->setParam('timeout', $settings->_cmdTimeout);
 	$view->setParam('xsendfile', $settings->_enableXsendfile);
 	$view->setParam('showfolders', $showfolders);
diff --git a/views/bootstrap/class.DropFolderChooser.php b/views/bootstrap/class.DropFolderChooser.php
index 065430aea..44105f441 100644
--- a/views/bootstrap/class.DropFolderChooser.php
+++ b/views/bootstrap/class.DropFolderChooser.php
@@ -54,16 +54,22 @@ $('.folderselect').click(function(ev) {
 		$dropfolderdir = $this->params['dropfolderdir'];
 		$showfolders = $this->params['showfolders'];
 		$cachedir = $this->params['cachedir'];
+		$conversionmgr = $this->params['conversionmgr'];
 		$previewwidth = $this->params['previewWidthMenuList'];
+		$previewconverters = $this->params['previewConverters'];
 		$timeout = $this->params['timeout'];
 		$xsendfile = $this->params['xsendfile'];
 		$folder = $this->params['folder'];
 
 		$previewer = new SeedDMS_Preview_Previewer($cachedir, $previewwidth, $timeout, $xsendfile);
+		if($conversionmgr)
+			$previewer->setConversionMgr($conversionmgr);
+		else
+			$previewer->setConverters($previewconverters);
 
 		$c = 0; // count files
 		$menuitems['dropfolder'] = array('label'=>'', 'children'=>array());
-		$dir = rtrim($dropfolderdir, '/').'/'.$user->getLogin();
+		$dir = rtrim($dropfolderdir, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR.$user->getLogin();
 		/* Check if we are still looking in the configured directory and
 		 * not somewhere else, e.g. if the login was '../test'
 		 */
@@ -74,21 +80,21 @@ $('.folderselect').click(function(ev) {
 				$finfo = finfo_open(FILEINFO_MIME_TYPE);
 				while (false !== ($entry = $d->read())) {
 					if($entry != '..' && $entry != '.') {
-						if($showfolders == 0 && !is_dir($dir.'/'.$entry) && is_readable($dir.'/'.$entry)) {
+						if($showfolders == 0 && !is_dir($dir.DIRECTORY_SEPARATOR.$entry) && is_readable($dir.DIRECTORY_SEPARATOR.$entry)) {
 							$c++;
 							$subitem = array('label'=>'', 'attributes'=>array(array('title', getMLText('menu_upload_from_dropfolder'))));
 							if($folder)
 								$subitem['link'] = $settings->_httpRoot.'out/out.AddDocument.php?folderid='.$folder->getId()."&dropfolderfileform1=".urldecode($entry);
-							$mimetype = finfo_file($finfo, $dir.'/'.$entry);
-							if(file_exists($dir.'/'.$entry)) {
+							$mimetype = finfo_file($finfo, $dir.DIRECTORY_SEPARATOR.$entry);
+							if(file_exists($dir.DIRECTORY_SEPARATOR.$entry)) {
 								if($previewwidth) {
-									$previewer->createRawPreview($dir.'/'.$entry, 'dropfolder/', $mimetype);
-									if($previewer->hasRawPreview($dir.'/'.$entry, 'dropfolder/')) {
+									$previewer->createRawPreview($dir.DIRECTORY_SEPARATOR.$entry, 'dropfolder'.DIRECTORY_SEPARATOR, $mimetype);
+									if($previewer->hasRawPreview($dir.DIRECTORY_SEPARATOR.$entry, 'dropfolder'.DIRECTORY_SEPARATOR)) {
 										$subitem['label'] .= "<div class=\"dropfolder-menu-img\" style=\"display: none; overflow:hidden; position: absolute; left:-".($previewwidth+10)."px; border: 1px solid #888;background: white;\"><img filename=\"".$entry."\" width=\"".$previewwidth."\" src=\"".$settings->_httpRoot."op/op.DropFolderPreview.php?filename=".$entry."&width=".$previewwidth."\" title=\"".htmlspecialchars($mimetype)."\"></div>";
 									}
+									$subitem['label'] .= "<div class=\"dropfolder-menu-text\" style=\"margin-left:10px; margin-right: 10px; display:inline-block;\">".$entry."<br /><span style=\"font-size: 85%;\">".SeedDMS_Core_File::format_filesize(filesize($dir.'/'.$entry)).", ".date('Y-m-d H:i:s', filectime($dir.'/'.$entry))."</span></div>";
+									$menuitems['dropfolder']['children'][] = $subitem;
 								}
-								$subitem['label'] .= "<div class=\"dropfolder-menu-text\" style=\"margin-left:10px; margin-right: 10px; display:inline-block;\">".$entry."<br /><span style=\"font-size: 85%;\">".SeedDMS_Core_File::format_filesize(filesize($dir.'/'.$entry)).", ".date('Y-m-d H:i:s', filectime($dir.'/'.$entry))."</span></div>";
-								$menuitems['dropfolder']['children'][] = $subitem;
 							}
 						} elseif($showfolders && is_dir($dir.'/'.$entry)) {
 							$subitem = array('label'=>$entry);