diff --git a/main/inc/lib/api.lib.php b/main/inc/lib/api.lib.php
index d2b15cd8cb..53557412d6 100644
--- a/main/inc/lib/api.lib.php
+++ b/main/inc/lib/api.lib.php
@@ -8085,3 +8085,23 @@ function api_protect_limit_for_session_admin()
 function api_is_student_view_active() {
     return (isset($_SESSION['studentview']) && $_SESSION['studentview'] == "studentview");
 }
+
+/**
+ * Returns an array of resolutions that can be used for the conversion of documents to images
+ * @return array
+ */
+function apiGetDocumentConversionSizes()
+{
+    return array(
+        '540x405'=>'540x405 (3/4)',
+        '640x480'=>'640x480 (3/4)',
+        '720x540'=>'720x540 (3/4)',
+        '800x600'=>'800x600 (3/4)',
+        '1024x576'=>'1024x576 (16/9)',
+        '1024x768'=>'1000x750 (3/4)',
+        '1280x720'=>'1280x720 (16/9)',
+        '1280x860'=>'1280x960 (3/4)',
+        '1400x1050'=>'1400x1050 (3/4)',
+        '1600x900'=>'1600x900 (16/9)'
+    );
+}
\ No newline at end of file