diff --git a/google_photo_to_vcard/add_photo.py b/google_photo_to_vcard/add_photo.py
index bafcbd5..f9eb8bb 100644
--- a/google_photo_to_vcard/add_photo.py
+++ b/google_photo_to_vcard/add_photo.py
@@ -1,3 +1,4 @@
+import logging
 from pathlib import Path
 
 import vobject
@@ -7,6 +8,9 @@ from google_photo_to_vcard.util import download_url_to_path
 from google_photo_to_vcard.util import read_email_photo_json
 
 
+logging.basicConfig(level=logging.DEBUG)
+
+
 def open_card(card_path):
     with open(card_path, mode='r') as f:
         return vobject.readOne(f.read())
@@ -14,7 +18,7 @@ def open_card(card_path):
 
 def maybe_add_photo(card, photo_path):
     if hasattr(card, 'photo'):
-        print('{} has photo'.format(card.fn.value))
+        logging.info('%s has photo', card.fn.value)
         return False
     photo = card.add('photo')
     photo.params = {
@@ -56,7 +60,7 @@ def main():
             if photo_path.exists():
                 if maybe_add_photo(card, photo_path):
                     write_card_to_path(card, card_path)
-                    print('Added photo to', card.fn.value)
+                    logging.info('Added photo to %s', card.fn.value)
 
 
 if __name__ == '__main__':
diff --git a/google_photo_to_vcard/build_photo_json.py b/google_photo_to_vcard/build_photo_json.py
index f42f3b8..1b02d68 100644
--- a/google_photo_to_vcard/build_photo_json.py
+++ b/google_photo_to_vcard/build_photo_json.py
@@ -1,10 +1,8 @@
-from __future__ import print_function
 import httplib2
 import json
 import logging
 import os
 import time
-from pprint import pprint
 
 from apiclient import discovery
 from googleapiclient.errors import HttpError
@@ -99,7 +97,7 @@ def get_credentials():
             credentials = tools.run_flow(flow, store, flags)
         else:  # Needed only for compatibility with Python 2.6
             credentials = tools.run(flow, store)
-        print('Storing credentials to ' + credential_path)
+        logging.info('Storing credentials to ' + credential_path)
     return credentials
 
 
@@ -160,9 +158,12 @@ def main():
                 len(email_to_photo),
             ))
 
-    # pprint(email_to_photo)
     write_email_photo_json(email_to_photo)
-    print('All done!')
+    logging.info('All done!')
+    logging.info('Found {} photos for {} emails'.format(
+        len(all_photos),
+        len(email_to_photo),
+    ))
 
 
 if __name__ == '__main__':
diff --git a/google_photo_to_vcard/download_photos.py b/google_photo_to_vcard/download_photos.py
index 6fe5530..daf0cdb 100644
--- a/google_photo_to_vcard/download_photos.py
+++ b/google_photo_to_vcard/download_photos.py
@@ -1,3 +1,4 @@
+import logging
 import urllib.request as request
 from pathlib import Path
 from urllib.error import HTTPError
@@ -7,13 +8,16 @@ from google_photo_to_vcard.util import download_url_to_path
 from google_photo_to_vcard.util import read_email_photo_json
 
 
+logging.basicConfig(level=logging.DEBUG)
+
+
 def main():
     email_to_photo = read_email_photo_json()
     for email, photo_url in email_to_photo.items():
-        print(email, photo_url)
+        loging.info('Downloading (%s, %s)', email, photo_url)
         photo_path = Path(build_photo_path(email))
         if photo_path.exists():
-            print('Photo already downloaded')
+            loging.debug('Photo already downloaded')
             continue
         else:
             download_url_to_path(photo_url, photo_path)
diff --git a/google_photo_to_vcard/util.py b/google_photo_to_vcard/util.py
index 877bce8..cf983a6 100644
--- a/google_photo_to_vcard/util.py
+++ b/google_photo_to_vcard/util.py
@@ -1,4 +1,5 @@
 import json
+import logging
 import urllib.request as request
 from urllib.error import HTTPError
 
@@ -26,5 +27,5 @@ def download_url_to_path(url, path):
             f.write(r.read())
             return path
     except HTTPError as e:
-        print(e)
+        logging.error(e)
         return None