diff --git a/src/img2pdf.py b/src/img2pdf.py
index f89670b..6fc044d 100755
--- a/src/img2pdf.py
+++ b/src/img2pdf.py
@@ -1075,7 +1075,7 @@ class pdfdoc(object):
         self.tostream(stream)
         return stream.getvalue()
 
-    def tostream(self, outputstream):
+    def tostream(self, outputstream, return_engine_doc=False):
         if self.engine == Engine.pikepdf:
             PdfArray = pikepdf.Array
             PdfDict = pikepdf.Dictionary
@@ -1267,6 +1267,9 @@ class pdfdoc(object):
                 self.writer.addobj(metadata)
                 self.writer.addobj(iccstream)
 
+        if return_engine_doc:
+            return self.writer, self.output_version
+
         # now write out the PDF
         if self.engine == Engine.pikepdf:
             kwargs = {}
@@ -2634,6 +2637,7 @@ def convert(*images, **kwargs):
         viewer_center_window=False,
         viewer_fullscreen=False,
         outputstream=None,
+        return_engine_doc=False,
         first_frame_only=False,
         allow_oversized=True,
         cropborder=None,
@@ -2800,6 +2804,9 @@ def convert(*images, **kwargs):
         pdf.tostream(kwargs["outputstream"])
         return
 
+    if kwargs["return_engine_doc"]:
+        return pdf.tostream(None, return_engine_doc=True)
+
     return pdf.tostring()