diff --git a/src/_h5ai/backend/php/core/class-setup.php b/src/_h5ai/backend/php/core/class-setup.php
index 9ef1dc7d..59618842 100644
--- a/src/_h5ai/backend/php/core/class-setup.php
+++ b/src/_h5ai/backend/php/core/class-setup.php
@@ -135,7 +135,7 @@ class Setup {
                 $cmd = 'which';
             }
 
-            foreach (['avconv', 'convert', 'du', 'ffmpeg', 'tar', 'zip'] as $c) {
+            foreach (['avconv', 'convert', 'du', 'ffmpeg', 'gm', 'tar', 'zip'] as $c) {
                 $cmds[$c] = ($cmd !== false) && Util::exec_0($cmd . ' ' . $c);
             }
 
@@ -175,6 +175,7 @@ class Setup {
                 'HAS_CMD_CONVERT',
                 'HAS_CMD_DU',
                 'HAS_CMD_FFMPEG',
+                'HAS_CMD_GM',
                 'HAS_CMD_TAR',
                 'HAS_CMD_ZIP'
             ]);
diff --git a/src/_h5ai/backend/php/ext/class-thumb.php b/src/_h5ai/backend/php/ext/class-thumb.php
index 65ee9504..71c3bbf7 100644
--- a/src/_h5ai/backend/php/ext/class-thumb.php
+++ b/src/_h5ai/backend/php/ext/class-thumb.php
@@ -5,6 +5,7 @@ class Thumb {
     private static $FFMPEG_CMDV = ['ffmpeg', '-ss', '0:00:10', '-i', '[SRC]', '-an', '-vframes', '1', '[DEST]'];
     private static $AVCONV_CMDV = ['avconv', '-ss', '0:00:10', '-i', '[SRC]', '-an', '-vframes', '1', '[DEST]'];
     private static $CONVERT_CMDV = ['convert', '-density', '200', '-quality', '100', '-sharpen', '0x1.0', '-strip', '[SRC][0]', '[DEST]'];
+    private static $GM_CONVERT_CMDV = ['gm', 'convert', '-density', '200', '-quality', '100', '-sharpen', '0x1.0', '[SRC][0]', '[DEST]'];
     private static $THUMB_CACHE = 'thumbs';
 
     private $context;
@@ -40,8 +41,12 @@ class Thumb {
             } else if ($this->setup->get('HAS_CMD_FFMPEG')) {
                 $capture_path = $this->capture(Thumb::$FFMPEG_CMDV, $source_path);
             }
-        } else if ($type === 'doc' && $this->setup->get('HAS_CMD_CONVERT')) {
-            $capture_path = $this->capture(Thumb::$CONVERT_CMDV, $source_path);
+        } else if ($type === 'doc') {
+            if ($this->setup->get('HAS_CMD_CONVERT')) {
+                $capture_path = $this->capture(Thumb::$CONVERT_CMDV, $source_path);
+            } else if ($this->setup->get('HAS_CMD_GM')) {
+                $capture_path = $this->capture(Thumb::$GM_CONVERT_CMDV, $source_path);
+            }
         }
 
         return $this->thumb_href($capture_path, $width, $height);
diff --git a/src/_h5ai/public/js/inc/main/info.js b/src/_h5ai/public/js/inc/main/info.js
index c4532845..cacac055 100644
--- a/src/_h5ai/public/js/inc/main/info.js
+++ b/src/_h5ai/public/js/inc/main/info.js
@@ -106,8 +106,8 @@ modulejs.define('main/info', ['$', 'config', 'core/resource', 'core/server'], fu
         );
 
         addTest(
-            'PDF thumbs', 'Command line program <code>convert</code> available',
-            setup.HAS_CMD_CONVERT
+            'PDF thumbs', 'Command line program <code>convert</code> or <code>gm</code> available',
+            setup.HAS_CMD_CONVERT || setup.HAS_CMD_GM
         );
 
         addTest(