diff --git a/CHANGELOG b/CHANGELOG
index e8d676e75..12848d04a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -15,6 +15,7 @@
   is done
 - fix sorting in search result
 - import of users can handle hidden and disabled flag
+- image conversion falls back to gd library if imagick extension is not loaded
 
 --------------------------------------------------------------------------------
                      Changes in version 5.1.26
diff --git a/inc/inc.ClassConversionServiceImageToImage.php b/inc/inc.ClassConversionServiceImageToImage.php
index 952efc4f0..b5c9e7951 100644
--- a/inc/inc.ClassConversionServiceImageToImage.php
+++ b/inc/inc.ClassConversionServiceImageToImage.php
@@ -28,15 +28,15 @@ class SeedDMS_ConversionServiceImageToImage extends SeedDMS_ConversionServiceBas
 	 */
 	public $timeout;
 
-	public function __construct($from, $to) {
+	public function __construct($from, $to) { /* {{{ */
 		$this->from = $from;
 		$this->to = $to;
 		$this->timeout = 5;
-	}
+	} /* }}} */
 
-	public function getInfo() {
-		return "Convert with imagick php functions";
-	}
+	public function getInfo() { /* {{{ */
+		return "Convert with imagick or gd php functions";
+	} /* }}} */
 
 	public function getAdditionalParams() { /* {{{ */
 		return [
@@ -44,28 +44,68 @@ class SeedDMS_ConversionServiceImageToImage extends SeedDMS_ConversionServiceBas
 		];
 	} /* }}} */
 
-	public function convert($infile, $target = null, $params = array()) {
+	/**
+	 * Convert a pixel image into png and scale it
+	 *
+	 * This method uses imagick and if not available falls back to the gd library.
+	 */
+	public function convert($infile, $target = null, $params = array()) { /* {{{ */
 		$start = microtime(true);
-		$imagick = new Imagick();
-		try {
-			if($imagick->readImage($infile)) {
+		if(extension_loaded('imagick')) {
+			$imagick = new Imagick();
+			try {
+				if($imagick->readImage($infile)) {
+					if(!empty($params['width']))
+						$imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0);
+					$end = microtime(true);
+					if($this->logger) {
+						$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with imagick service took '.($end-$start).' sec.', PEAR_LOG_INFO);
+					}
+					if($target) {
+						return $imagick->writeImage($target);
+					} else {
+						return $imagick->getImageBlob();
+					}
+				}
+			} catch (ImagickException $e) {
+				return false;
+			}
+		} elseif(extension_loaded('gd')) {
+			$im = null;
+			switch($this->from) {
+			case 'image/jpeg':
+			case 'image/jpg':
+				$im = @imagecreatefromjpeg($infile);
+				break;
+			case 'image/png':
+				$im = @imagecreatefrompng($infile);
+				break;
+			case 'image/gif':
+				$im = @imagecreatefromgif($infile);
+				break;
+			}
+			if($im) {
+				$size = getimagesize($infile);
 				if(!empty($params['width']))
-					$imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0);
+					$im = imagescale($im, min((int) $params['width'], $size[0]));
 				$end = microtime(true);
 				if($this->logger) {
-					$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with image service took '.($end-$start).' sec.', PEAR_LOG_INFO);
+					$this->logger->log('Conversion from '.$this->from.' to '.$this->to.' with gd image service took '.($end-$start).' sec.', PEAR_LOG_INFO);
 				}
 				if($target) {
-					return $imagick->writeImage($target);
+					return imagepng($im, $target);
 				} else {
-					return $imagick->getImageBlob();
+					ob_start();
+					var_dump(imagepng($im));
+					$image = ob_get_clean();
+					return $image;
 				}
+			} else {
+				return false;
 			}
-		} catch (ImagickException $e) {
-			return false;
 		}
 		return false;
-	}
+	} /* }}} */
 }
 
 
diff --git a/inc/inc.ConversionInit.php b/inc/inc.ConversionInit.php
index 23795180c..bfda6f0c9 100644
--- a/inc/inc.ConversionInit.php
+++ b/inc/inc.ConversionInit.php
@@ -23,13 +23,15 @@ if(!empty($settings->_converters['fulltext'])) {
 
 if(extension_loaded('imagick')) {
 	$conversionmgr->addService(new SeedDMS_ConversionServicePdfToImage('application/pdf', 'image/png'))->setLogger($logger);
+	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/tiff', 'image/png'))->setLogger($logger);
+	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/svg+xml', 'image/png'))->setLogger($logger);
+}
 
+if(extension_loaded('gd') || extension_loaded('imagick')) {
 	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/jpeg', 'image/png'))->setLogger($logger);
 	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/png', 'image/png'))->setLogger($logger);
 	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/jpg', 'image/png'))->setLogger($logger);
 	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/gif', 'image/png'))->setLogger($logger);
-	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/tiff', 'image/png'))->setLogger($logger);
-	$conversionmgr->addService(new SeedDMS_ConversionServiceImageToImage('image/svg+xml', 'image/png'))->setLogger($logger);
 }
 
 $conversionmgr->addService(new SeedDMS_ConversionServiceTextToText('text/plain', 'text/plain'))->setLogger($logger);