diff --git a/mdrsclient/commands/upload.py b/mdrsclient/commands/upload.py
index cc683b2..fbc7c82 100644
--- a/mdrsclient/commands/upload.py
+++ b/mdrsclient/commands/upload.py
@@ -26,6 +26,12 @@ class UploadCommand(BaseCommand):
         upload_parser.add_argument(
             "-r", "--recursive", help="upload directories and their contents recursive", action="store_true"
         )
+        upload_parser.add_argument(
+            "-s",
+            "--skip-if-exists",
+            help="skip the upload if file is already uploaded and file size is the same",
+            action="store_true",
+        )
         upload_parser.add_argument("local_path", help="local file path (/foo/bar/data.txt)")
         upload_parser.add_argument("remote_path", help="remote folder path (remote:/lab/path/)")
         upload_parser.set_defaults(func=cls.func)
@@ -35,10 +41,11 @@ class UploadCommand(BaseCommand):
         local_path = str(args.local_path)
         remote_path = str(args.remote_path)
         is_recursive = bool(args.recursive)
-        cls.upload(local_path, remote_path, is_recursive)
+        is_skip_if_exists = bool(args.skip_if_exists)
+        cls.upload(local_path, remote_path, is_recursive, is_skip_if_exists)
 
     @classmethod
-    def upload(cls, local_path: str, remote_path: str, is_recursive: bool) -> None:
+    def upload(cls, local_path: str, remote_path: str, is_recursive: bool, is_skip_if_exists: bool) -> None:
         (remote, laboratory_name, r_path) = cls._parse_remote_host_with_path(remote_path)
         l_path = os.path.abspath(local_path)
         if not os.path.exists(l_path):
@@ -78,22 +85,24 @@ class UploadCommand(BaseCommand):
                     infos.append(UploadFileInfo(folder_map[d_dirname], os.path.join(dirpath, filename)))
         else:
             infos.append(UploadFileInfo(folder, l_path))
-        cls.__multiple_upload(connection, infos)
+        cls.__multiple_upload(connection, infos, is_skip_if_exists)
 
     @classmethod
-    def __multiple_upload(cls, connection: MDRSConnection, infos: list[UploadFileInfo]) -> None:
+    def __multiple_upload(
+        cls, connection: MDRSConnection, infos: list[UploadFileInfo], is_skip_if_exists: bool
+    ) -> None:
         file_api = FilesApi(connection)
         with ThreadPoolExecutor(max_workers=CONCURRENT) as pool:
-            pool.map(lambda x: cls.__multiple_upload_worker(file_api, x), infos)
+            pool.map(lambda x: cls.__multiple_upload_worker(file_api, x, is_skip_if_exists), infos)
 
     @classmethod
-    def __multiple_upload_worker(cls, file_api: FilesApi, info: UploadFileInfo) -> None:
+    def __multiple_upload_worker(cls, file_api: FilesApi, info: UploadFileInfo, is_skip_if_exists: bool) -> None:
         basename = os.path.basename(info.path)
         file = info.folder.find_file(basename)
         try:
             if file is None:
                 file_api.create(info.folder.id, info.path)
-            else:
+            elif not is_skip_if_exists or file.size != os.path.getsize(info.path):
                 file_api.update(file, info.path)
             print(os.path.join(info.folder.path, basename))
         except MDRSException as e: