diff --git a/history.txt b/history.txt
index 2b25cd8..65c6eb5 100644
--- a/history.txt
+++ b/history.txt
@@ -1,3 +1,5 @@
++ Allow to save result to file-like object.
+
 17.04.2025 ver.1.7
 ------------------
 
diff --git a/markdown_pdf/__init__.py b/markdown_pdf/__init__.py
index e234577..335bc60 100644
--- a/markdown_pdf/__init__.py
+++ b/markdown_pdf/__init__.py
@@ -116,8 +116,8 @@ def save(self, file_name: typing.Union[str, pathlib.Path]) -> None:
             doc.save(file_name)
         doc.close()
 
-    def save_bytes(self, bytesio: io.BytesIO) -> None:
-        """Save pdf to file-like object."""
+    def save_bytes(self, bytesio: io.BytesIO) -> int:
+        """Save pdf to file-like object and return byte size of the filled object."""
         doc = self._make_doc()
 
         pdf = _as_pdf_document(doc)
@@ -150,3 +150,5 @@ def save_bytes(self, bytesio: io.BytesIO) -> None:
         out = JM_new_output_fileptr(bytesio)
         mupdf.pdf_write_document(pdf, out, opts)
         out.fz_close_output()
+
+        return bytesio.getbuffer().nbytes