diff --git a/utils.py b/utils.py
index 87e4e51..7a2d8ee 100644
--- a/utils.py
+++ b/utils.py
@@ -19,7 +19,7 @@ parser.add_argument(
 )
 parser.add_argument("-i","--ignore-temp", action="store_true", help="[requires -a] do not delete alt tmp")
 parser.add_argument(
-    "-f", "--format", type=str, default="png", help="use output custom img format"
+    "-f", "--img-format", type=str, default="png", help="use output custom img format"
 )
 
 args = parser.parse_args()
@@ -28,7 +28,7 @@ dest = args.destination
 verbose = args.verbose
 alt_temp = args.alt_temp
 ignore_temp = args.ignore_temp
-format = args.format
+img_format = args.img_format
 
 if verbose:
     logging.basicConfig(level=logging.DEBUG, format="[%(levelname)s] - %(message)s")
diff --git a/vid2sheet.py b/vid2sheet.py
index d0799f9..b8245be 100644
--- a/vid2sheet.py
+++ b/vid2sheet.py
@@ -1,7 +1,7 @@
 from utils import Download
 from utils import Misc
 from utils import log
-from utils import src, dest, alt_temp, format, ignore_temp, verbose
+from utils import src, dest, alt_temp, img_format, ignore_temp, verbose
 
 from tqdm import tqdm
 import tempfile
@@ -238,5 +238,5 @@ class Vid2Sheet:
 
 
 if __name__ == "__main__":
-    vid2sheet = Vid2Sheet(src, dest, format, alt_temp, ignore_temp)
+    vid2sheet = Vid2Sheet(src, dest, img_format, alt_temp, ignore_temp)
     vid2sheet.run()