diff --git a/mglib/tiff.py b/mglib/tiff.py
index 3756235..c539180 100644
--- a/mglib/tiff.py
+++ b/mglib/tiff.py
@@ -7,16 +7,33 @@ from .conf import settings
 logger = logging.getLogger(__name__)
 
 
-def convert_tiff2pdf(doc_url):
+def pdfname_from_tiffname(doc_url):
+    """
+    Given tiff document url, will return
+    respective pdf file name. Returned
+    file name can be use used as destination
+    for tiff2pdf tool.
 
-    logger.debug(f"convert_tiff2pdf for {doc_url}")
+    Returns a tuple (new_doc_url, new_filename).
+    new_doc_url - is new absolute path to the pdf file
+    new_filename - is new pdf filename
+    """
     # basename is filename + ext (no path)
-
     basename = os.path.basename(doc_url)
     base_root, base_ext = os.path.splitext(basename)
     root, ext = os.path.splitext(doc_url)
     new_doc_url = f"{root}.pdf"
 
+    return new_doc_url, f"{base_root}.pdf"
+
+def convert_tiff2pdf(doc_url):
+
+    logger.debug(f"convert_tiff2pdf for {doc_url}")
+
+    new_doc_url, new_filename = pdfname_from_tiffname(
+        doc_url
+    )
+
     logger.debug(
         f"tiff2pdf source={doc_url} dest={new_doc_url}"
     )
@@ -30,4 +47,4 @@ def convert_tiff2pdf(doc_url):
     run(cmd)
 
     # returns new filename
-    return f"{base_root}.pdf"
+    return new_filename